JP2013211332A - Surface-mounted inductor - Google Patents

Surface-mounted inductor Download PDF

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JP2013211332A
JP2013211332A JP2012079241A JP2012079241A JP2013211332A JP 2013211332 A JP2013211332 A JP 2013211332A JP 2012079241 A JP2012079241 A JP 2012079241A JP 2012079241 A JP2012079241 A JP 2012079241A JP 2013211332 A JP2013211332 A JP 2013211332A
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mount inductor
coil
winding
drum
collar
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JP5490842B2 (en
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Yusuke Kito
佑典 鬼頭
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Toko Inc
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Abstract

PROBLEM TO BE SOLVED: To solve the problem that a collar cannot be reduced in thickness and a thick conductor cannot be used for a coil with respect to a surface-mounted inductor using a drum type core since when the coil is wound during assembling of the inductor, a binding portion is caught by the coil and the coil cannot be wound well.SOLUTION: There is provided a surface-mounted inductor that comprises a drum type core having a pair of collars at both ends of a roll, a coil wound around the roll of the drum type core, and a pair of metal terminals. The metal terminals each comprise a mounting portion arranged on an end face of one collar and a binding portion projecting from an outer periphery of the collar, and the binding portion is provided with unevenness bent in a corrugated shape, and binds a terminal of the coil along the unevenness.

Description

本発明は、ドラム形状の磁性体コアを用いた低背形の面実装インダクタに関するものである。   The present invention relates to a low-profile surface-mount inductor using a drum-shaped magnetic core.

ＤＣ／ＤＣコンバータ等のチョークコイル用にドラム形コアに巻線を施したインダクタが用いられている。このようなインダクタとして、面実装可能な形状とした面実装インダクタが一般的に用いられてる。   An inductor in which a drum core is wound is used for a choke coil such as a DC / DC converter. As such an inductor, a surface mount inductor having a surface mountable shape is generally used.

図３は従来の面実装インダクタの縦断面図であり、図４は、図３の部分拡大図である。
図３に示すように、従来の面実装インダクタ６０は、巻軸７３のそれぞれの端に上鍔７１、下鍔７２を有するドラム形コア７０と、巻軸７３に巻回された巻線８０と、下鍔７２の下面に設けられた一対の金属端子９０、９３からなる。
ドラム形コア７０は、ニッケル系のフェライト等の磁性材で形成される。巻線８０は、断面円形の導線をポリウレタン樹脂等で絶縁被覆されたものが用いられる。金属端子９０、９３は、表面がめっきされたリン青銅等の板状の金属板を所定の形に打ち抜いてから、プレス等で折り曲げることにより形成されている。
金属端子９０、９３は、ドラム形コアに取り付けられて実装端子となる端子部９１、９４と、端子部９１、９４から下鍔７２の外周方向に延設した絡げ部９２、９５を具えている。実装端子部９１、９４に接着材１００が塗布され鍔７２の下面に接着され、それぞれ絡げ部９２、９５に巻線８０の端末８１、８２が絡げられ、はんだ付けされて電気的に接続される。 FIG. 3 is a longitudinal sectional view of a conventional surface mount inductor, and FIG. 4 is a partially enlarged view of FIG.
As shown in FIG. 3, the conventional surface mount inductor 60 includes a drum core 70 having an upper collar 71 and a lower collar 72 at each end of a winding shaft 73, and a winding 80 wound around the winding shaft 73. And a pair of metal terminals 90, 93 provided on the lower surface of the lower collar 72.
The drum-shaped core 70 is formed of a magnetic material such as nickel-based ferrite. As the winding 80, a conductor having a circular cross section and having an insulating coating with polyurethane resin or the like is used. The metal terminals 90 and 93 are formed by punching a plate-shaped metal plate such as phosphor bronze whose surface is plated into a predetermined shape, and then bending it with a press or the like.
The metal terminals 90, 93 include terminal portions 91, 94 that are attached to the drum-shaped core and serve as mounting terminals, and binding portions 92, 95 that extend from the terminal portions 91, 94 in the outer peripheral direction of the lower collar 72. Yes. The adhesive 100 is applied to the mounting terminal portions 91 and 94 and adhered to the lower surface of the flange 72, and the ends 81 and 82 of the winding 80 are entangled and soldered to the binding portions 92 and 95, respectively. Is done.

ニッケル系のフェライトは抵抗値が高いので、直接金属板を鍔面に接着できるので、低背化しやすく、製造方法も簡単で安価なことから多く用いられている。   Since nickel-based ferrite has a high resistance value, a metal plate can be directly bonded to the side surface, so that it is easy to reduce the height, and the manufacturing method is simple and inexpensive.

特開平８−２７３９４７JP-A-8-273947

上記した面実装インダクタの一製造方法は下記の通りである。
まず、金属端子９１、９３の端子部９１、９４の上面に接着剤１００を塗布し、ドラム形コア７０の下鍔７２の下面に接着する。
次に、一方の金属端子９０の絡げ部９２に、絶縁被覆された導線の先端部８１を絡げる。そして、上鍔７０をチャックしてドラム形コアを回転して、ドラム形コア７０の巻軸７３に巻線を巻回する。
その後、他方の金属端子９３の絡げ部９５に、巻線の終端部８２を絡げる。この状態では、金属端子９０、９３と、巻線の先端部８１、８２とは電気的に接続されていない。
最後に、絡げ部９２、９５を溶融はんだ槽に浸漬して、はんだの熱で導線の絶縁被覆を除去とはんだづけを同時に行い、端末と金属端子を電気的に接続する。 One manufacturing method of the surface mount inductor described above is as follows.
First, the adhesive 100 is applied to the upper surfaces of the terminal portions 91 and 94 of the metal terminals 91 and 93 and bonded to the lower surface of the lower collar 72 of the drum core 70.
Next, the leading end portion 81 of the insulated wire is bound to the binding portion 92 of one metal terminal 90. Then, the upper collar 70 is chucked to rotate the drum core, and the winding is wound around the winding shaft 73 of the drum core 70.
Thereafter, the end portion 82 of the winding is bound to the binding portion 95 of the other metal terminal 93. In this state, the metal terminals 90 and 93 and the leading ends 81 and 82 of the winding are not electrically connected.
Finally, the binding portions 92 and 95 are immersed in a molten solder bath, and the insulation of the conductive wire is removed and soldered simultaneously with the heat of the solder, thereby electrically connecting the terminal and the metal terminal.

上記した製造方法においては、絡げ部９２の上端が下鍔７２の上面より上側に配置されていると、巻線の巻回時にドラム形コア７０を回転させた際に、絡げ部９２が巻線の引出し部に引っかかり、うまく巻線できないという問題が生じる。
また、図４に示すように、面実装インダクタ６０をプリント基板１１０に実装時に、絡げ部９２、９５の下端がプリント基板１１０と接触しないように、絡げ部９２、９５の下端から実装部９１、９４まで距離が必要である（Ａ０＞０）。
つまり、巻線の端末が絡げられた絡げ部９２、９５が、下鍔７２の厚みｔ０の内側に配置しなければならないという制限がある。 In the manufacturing method described above, when the upper end of the binding portion 92 is disposed above the upper surface of the lower rod 72, when the drum core 70 is rotated during winding of the winding, the binding portion 92 is There is a problem that the coil is caught by the drawn portion of the winding and cannot be wound well.
Further, as shown in FIG. 4, when the surface mount inductor 60 is mounted on the printed circuit board 110, the mounting portion starts from the lower end of the binding portions 92 and 95 so that the lower end of the binding portions 92 and 95 does not come into contact with the printed circuit board 110. A distance from 91 to 94 is required (A 0 > 0).
That, tied part 92 and 95 to which the terminal of the winding has been tied is, there is a limitation that must be placed inside the thickness t 0 of the lower flange 72.

しかし、ＤＣ／ＤＣコンバータで用いるチョークコイルは、変換効率を高めるために、できるだけ太い導線で巻線して直流抵抗Ｒｄｃを下げている。
そのため、従来の面実装インダクタ６０では、巻線が太いと、絡げ部９２、９５の高さ方向の外径Ｂ０が大きくなり、下鍔７２の厚みｔ０を厚くしなければならなくなる。その結果、面実装インダクタ６０の高さが高くなってしまうという問題があった。 However, the choke coil used in the DC / DC converter is wound with a conductor that is as thick as possible to reduce the DC resistance R dc in order to increase the conversion efficiency.
Therefore, in the conventional surface-mount inductor 60, the winding is thick, outer diameter B 0 in the height direction of the tied part 92, 95 is increased will have to increase the thickness t 0 of the lower flange 72. As a result, there is a problem that the height of the surface mount inductor 60 is increased.

また巻線が太いと、巻軸７３に巻回できる巻数が減ってしまう。そのため巻線８０を巻軸７３に巻ききれない場合には巻軸７３を長くしたり、細くしたり、鍔７１、７２を薄くしなければならない。しかし、鍔の厚さｔ０はもともと面実装インダクタ６０を低背化するために薄くしてあるため、これ以上、鍔７１、７２を薄くすることは困難であり、巻軸７３を長くしなければならなくなる。その結果、面実装インダクタ６０の高さが高くなってしまうという問題があった。 If the winding is thick, the number of turns that can be wound around the winding shaft 73 is reduced. Therefore, when the winding 80 cannot be wound around the winding shaft 73, the winding shaft 73 must be lengthened or thinned, and the flanges 71 and 72 must be thinned. However, since the thickness t 0 of the flange is originally reduced to reduce the height of the surface mount inductor 60, it is difficult to make the flanges 71 and 72 thinner, and the winding shaft 73 must be lengthened. I will have to. As a result, there is a problem that the height of the surface mount inductor 60 is increased.

上記の課題を解決するために、本発明の面実装インダクタは、
巻軸の両端に一対の鍔を有するドラム形コアと、
該ドラム形コアの巻軸に巻回されるコイルと、
一対の金属端子とからなる面実装インダクタであって、
前記金属端子は、一方の鍔の端面に配置される実装部と、
鍔の外周に突出した絡げ部とからなり、
前記絡げ部は、波状に折り曲げられた凹凸が設けられ、
前記凹凸に沿って、前記巻線の端末部が絡げられる
を特徴とする。 In order to solve the above problems, the surface mount inductor of the present invention is:
A drum core having a pair of hooks at both ends of the winding shaft;
A coil wound around a winding shaft of the drum-shaped core;
A surface-mount inductor comprising a pair of metal terminals,
The metal terminal has a mounting portion disposed on an end surface of one of the collars,
It consists of a tie part protruding on the outer periphery of the heel,
The binding portion is provided with irregularities bent in a wave shape,
A terminal portion of the winding is entangled along the unevenness.

本発明の面実装インダクタによれば、鍔の厚さを薄くすることなく、面実装インダクタを低背化できる。また、直流抵抗ＲＤＣを小さくするために太い導線を用いても、鍔を厚くしたり、巻軸を長くしたりすることなく、面実装インダクタを低背化できる。 According to the surface mount inductor of the present invention, the height of the surface mount inductor can be reduced without reducing the thickness of the flange. Even if a thick conductor is used to reduce the direct current resistance R DC , the height of the surface-mount inductor can be reduced without increasing the thickness of the flange or the winding axis.

本発明の面実装インダクタの一実施例を示す分解斜視図である。It is a disassembled perspective view which shows one Example of the surface mount inductor of this invention. 図１の断面図である。It is sectional drawing of FIG. 従来の面実装インダクタの縦断面図である。It is a longitudinal cross-sectional view of the conventional surface mount inductor. 図３の部分拡大図である。FIG. 4 is a partially enlarged view of FIG. 3.

本発明の面実装インダクタの一実施例について、図面を用いて説明する。
図１は、本発明の面実装インダクタの分解斜視図であり、図２は縦断面図である。図１および図２に示すように、本発明の面実装インダクタ１０は、巻軸２３の両端に上鍔２１、下鍔２２を有するドラム形コア２０と、樹脂で絶縁被覆された導線をドラム形コア２０の巻軸２３に巻回した巻線３０と、下鍔２２の下面に設けられた一対の金属端子４０、４３からなる。 An embodiment of the surface mount inductor according to the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view of a surface mount inductor according to the present invention, and FIG. 2 is a longitudinal sectional view. As shown in FIGS. 1 and 2, a surface mount inductor 10 according to the present invention includes a drum-shaped core 20 having an upper rod 21 and a lower rod 22 at both ends of a winding shaft 23, and a drum-shaped conductive wire coated with resin. The coil 30 is wound around the winding shaft 23 of the core 20 and a pair of metal terminals 40 and 43 provided on the lower surface of the lower collar 22.

金属端子４０、４３は、表面がめっきされたリン青銅等の板状の金属板を所定の形に打ち抜いて、折り曲げた物であり、ドラム形コアの実装端子となる端子部４１、４４と、端子部４１、４４から下鍔２２の外周方向に延設した絡げ部４２、４５を具えるとともに、絡げ部４２、４５は、波の高さがｈの波状に折り曲げられている。
実装端子部４１、４４には接着材５０が塗布され、鍔２２の下面に固定される。
巻線３０の端末３１、３２は、それぞれ絡げ部４２、４５に絡げられ、はんだ付けされて電気的に接続される。このとき、端末３１、３２は、絡げ部４２、４５の表面と裏面のそれぞれの波の底部に沿って配置されて絡げられる。この溝は、絡げ部４２、４５の表裏で位置がことなるので、断面視で千鳥状に絡げられる。
このような構造とすることにより、従来の綿実装インダクタと比較して、絡げ部４２、４５の高さ方向の外径Ｂ１を、小さくすることができる。 The metal terminals 40 and 43 are formed by punching a plate-like metal plate such as phosphor bronze whose surface is plated into a predetermined shape and bending it, and terminal portions 41 and 44 serving as mounting terminals for the drum-shaped core, The binding portions 42 and 45 extending from the terminal portions 41 and 44 in the outer peripheral direction of the lower collar 22 are provided, and the binding portions 42 and 45 are bent in a wave shape having a wave height of h.
An adhesive 50 is applied to the mounting terminal portions 41 and 44 and fixed to the lower surface of the flange 22.
The ends 31 and 32 of the winding 30 are respectively entangled with the entangled portions 42 and 45, soldered, and electrically connected. At this time, the terminals 31 and 32 are arranged and entangled along the wave bottoms of the front and back surfaces of the binding portions 42 and 45, respectively. Since the positions of the grooves are different on the front and back of the binding portions 42 and 45, the grooves are wound in a staggered manner in a sectional view.
With such a structure, as compared to conventional cotton mount inductor, the outer diameter B 1 in the height direction of the tied part 42 and 45 can be reduced.

なお、波の高さｈは、巻線の直径より大きいとかえって絡げ部の高さ方向の外径が大きくなってしまうため、波の高さｈは、巻線の直径以下が望ましい。   Note that if the wave height h is larger than the diameter of the winding, the outer diameter in the height direction of the binding portion becomes large. Therefore, the wave height h is preferably equal to or less than the diameter of the winding.

たとえば、従来の面実装インダクタでは、金属板の厚さが０．３ｍｍ、巻線の直径は０．４ｍｍを９ターン巻回であり、このときの直流抵抗ＲＤＣは１１ｍΩであったが、本発明の面実装インダクタでは、同じコアに直径０．６ｍｍの巻線をした場合の直流抵抗ＲＤＣは１０ｍΩであった。
同じ直径０．４ｍｍの巻線を用いた場合、従来の面実装インダクタでは、絡げ部の高さ方向の外径Ｂ１は実測値で１．２５ｍｍであったが、本発明の面実装インダクタでは、絡げ部の高さ方向の外径Ｂ０は実測値で、０．７５ｍｍと、約４０％小さくすることができた。この結果、絡げ部４２、４５の下鍔２２の厚さを約４０％薄くすることができる。 For example, in the conventional surface mount inductor, the thickness of the metal plate is 0.3 mm and the diameter of the winding is 0.4 mm, and the DC resistance R DC at this time is 11 mΩ. In the surface mount inductor of the invention, the direct current resistance R DC when the winding of 0.6 mm in diameter was wound on the same core was 10 mΩ.
When windings having the same diameter of 0.4 mm are used, in the conventional surface-mount inductor, the outer diameter B 1 in the height direction of the binding portion is 1.25 mm as an actual measurement value. in an outer diameter B 0 are measured values of the height direction of the tied part, and 0.75 mm, it could be about 40% smaller. As a result, the thickness of the lower collar 22 of the binding portions 42 and 45 can be reduced by about 40%.

上記したように本発明の面実装インダクタは、鍔の厚さをより薄くすることができ、鍔の厚さを厚くしたり、巻軸を長くしたりすることなく、太い巻線を用いることができ、直流抵抗ＲＤＣが小さく、低背化、低直流抵抗化した面実装インダクタとすることができる。 As described above, the surface-mount inductor according to the present invention can reduce the thickness of the collar, and can use a thick winding without increasing the thickness of the collar or lengthening the winding axis. In addition, a surface mount inductor having a small DC resistance R DC , a low profile, and a low DC resistance can be obtained.

また、絡げ部に凹凸を設けたことにより、従来の面実装インダクタの金属端子の絡げ部では絡げ状態が安定せず、接合状態の不具合の要因になる場合があったが、本発明の面実装インダクタでは、巻線の端末が凹凸の谷に沿って配置されるため、強固に接続され、はんだ濡れ性もよくなり、接続不具合の虞も無くなる。   In addition, by providing irregularities in the binding portion, the binding state of the metal terminal of the conventional surface mount inductor may not be stable, which may cause a problem in the bonding state. In this surface mount inductor, since the ends of the windings are arranged along the concave and convex valleys, they are firmly connected, the solder wettability is improved, and there is no possibility of connection failure.

以上、ドラム形コアを用いた面実装インダクタの実施例を述べたが、例えばドラム形コアとリングコアを組み合わせた面実装インダクタや、ドラム形コアの、巻線の外周であって鍔間に磁性体粉を混練した樹脂を配置した面実装インダクタに対しても、本願発明を適用可能である。   In the above, examples of surface mount inductors using a drum core have been described. For example, a surface mount inductor that combines a drum core and a ring core, or a drum-shaped core, and a magnetic material on the outer periphery of a winding. The present invention can also be applied to a surface mount inductor in which a resin kneaded with powder is arranged.

１０、６０ 面実装インダクタ
２０、７０ ドラム形コア
２１、７１ 上鍔
２２、７２ 下鍔
２３、７３ 巻軸
３０、８０ 巻線
３１、３２、８１、８２ 端末部
４０、９０ 金属端子
４１、４４、９１、９４ 端子部
４２、４５、９２、９５ 絡げ部
５０、１００ 接着剤
１１０ 基板 10, 60 Surface mount inductor 20, 70 Drum-shaped core 21, 71 Upper rod 22, 72 Lower rod 23, 73 Winding shaft 30, 80 Winding 31, 32, 81, 82 Terminal portion 40, 90 Metal terminals 41, 44, 91, 94 Terminal portions 42, 45, 92, 95 Tying portions 50, 100 Adhesive 110 Substrate

Claims (3)

巻軸の両端に一対の鍔を有するドラム形コアと、
該ドラム形コアの巻軸に巻回されるコイルと、
一対の金属端子とからなる面実装インダクタであって、
前記金属端子は、一方の鍔の端面に配置される実装部と、
鍔の外周に突出した絡げ部とからなり、
前記絡げ部は、波状に折り曲げられた凹凸が設けられ、
前記凹凸に沿って、前記巻線の端末部が絡げられることを特徴とする
面実装インダクタ。 A drum core having a pair of hooks at both ends of the winding shaft;
A coil wound around a winding shaft of the drum-shaped core;
A surface-mount inductor comprising a pair of metal terminals,
The metal terminal has a mounting portion disposed on an end surface of one of the collars,
It consists of a tie part protruding on the outer periphery of the heel,
The binding portion is provided with irregularities bent in a wave shape,
A surface-mount inductor, wherein a terminal portion of the winding is entangled along the unevenness. 前記ドラム形コアに見解されたコイルの外周であって鍔間に、磁性体が混練された樹脂が配置されたことを特徴とする請求項１記載の面実装インダクタ。 2. The surface-mount inductor according to claim 1, wherein a resin in which a magnetic material is kneaded is disposed between the outer periphery of the coil as viewed in the drum-shaped core and between the ribs. 前記ドラム形コアの外周に、リング状のコアを配置したことを特徴とする請求項１乃至２記載の面実装インダクタ。 3. A surface-mount inductor according to claim 1, wherein a ring-shaped core is disposed on the outer periphery of the drum-shaped core.
JP2012079241A 2012-03-30 2012-03-30 Surface mount inductor Expired - Fee Related JP5490842B2 (en)

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JP2013211332A true JP2013211332A (en) 2013-10-10
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KR101433617B1 (en) 2014-05-01 2014-08-25 (주)다코웰 Metal core winding inductor
CN108922753A (en) * 2016-04-12 2018-11-30 福建元华泵业有限公司 A kind of Novel submersible pump

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US9831023B2 (en) * 2014-07-10 2017-11-28 Cyntec Co., Ltd. Electrode structure and the corresponding electrical component using the same and the fabrication method thereof

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JPH0917636A (en) * 1995-06-30 1997-01-17 Mitsumi Electric Co Ltd Fixed coil
JP2005004982A (en) * 2003-06-09 2005-01-06 Tanaka Kikinzoku Kogyo Kk Electrode and method for manufacturing same
JP2007080922A (en) * 2005-09-12 2007-03-29 Sumida Corporation Inductor
JP2007287746A (en) * 2006-04-12 2007-11-01 Sumida Corporation Transformer, and hoop material therefor
JP2008159964A (en) * 2006-12-26 2008-07-10 Nec Tokin Corp Drum-sleeve type inductor
JP2008205294A (en) * 2007-02-21 2008-09-04 Sumida Corporation Magnetic element
JP2009021310A (en) * 2007-07-10 2009-01-29 Murata Mfg Co Ltd Winding type electronic component and its manufacturing method

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JPH0281005U (en) * 1988-12-09 1990-06-22
JPH0917636A (en) * 1995-06-30 1997-01-17 Mitsumi Electric Co Ltd Fixed coil
JP2005004982A (en) * 2003-06-09 2005-01-06 Tanaka Kikinzoku Kogyo Kk Electrode and method for manufacturing same
JP2007080922A (en) * 2005-09-12 2007-03-29 Sumida Corporation Inductor
JP2007287746A (en) * 2006-04-12 2007-11-01 Sumida Corporation Transformer, and hoop material therefor
JP2008159964A (en) * 2006-12-26 2008-07-10 Nec Tokin Corp Drum-sleeve type inductor
JP2008205294A (en) * 2007-02-21 2008-09-04 Sumida Corporation Magnetic element
JP2009021310A (en) * 2007-07-10 2009-01-29 Murata Mfg Co Ltd Winding type electronic component and its manufacturing method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101433617B1 (en) 2014-05-01 2014-08-25 (주)다코웰 Metal core winding inductor
CN108922753A (en) * 2016-04-12 2018-11-30 福建元华泵业有限公司 A kind of Novel submersible pump

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