JP3743358B2 - choke coil - Google Patents

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Publication number
JP3743358B2
JP3743358B2 JP2001365849A JP2001365849A JP3743358B2 JP 3743358 B2 JP3743358 B2 JP 3743358B2 JP 2001365849 A JP2001365849 A JP 2001365849A JP 2001365849 A JP2001365849 A JP 2001365849A JP 3743358 B2 JP3743358 B2 JP 3743358B2
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JP
Japan
Prior art keywords
ring core
core
choke coil
mounting
winding
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Expired - Fee Related
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JP2001365849A
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Japanese (ja)
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JP2003168608A (en
Inventor
孝幸 小森
人志 岩崎
進 西口
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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Priority to JP2001365849A priority Critical patent/JP3743358B2/en
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Description

【0001】
【発明の属する技術分野】
本発明は各種電子機器等に用いるチョークコイルに関するものである。
【0002】
【従来の技術】
以下、従来のチョークコイルについて図面を参照しながら説明する。
【0003】
図8は従来のチョークコイルの斜視図、図9は同チョークコイルの分解斜視図である。
【0004】
図8、図9において、従来のチョークコイルは、巻軸部21の一端に上端鍔22を有し、この巻軸部21の他端に上端鍔22の径と略等しい径の下端鍔23を有したドラムコア24と、このドラムコア24の巻軸部21に巻回した巻線25と、ドラムコア24を内包する円柱状の空間を有するとともに、4つの角部を有した角柱形状のリングコア26と、このリングコア26に取り付けるとともに巻線25と電気的接続をした端子27とを備えて構成されている。
【0005】
また、ドラムコア24とリングコア26との間にはギャップ部を設けてあり、このギャップ部に接着剤を塗布して、ドラムコア24とリングコア26とを接着している。
【0006】
さらに、端子27は、リングコア26の相対向する両端面の上面に係合し巻線25と接続する接続部29と、リングコア26の両端面の下面に係合しこのリングコア26の外周面に配置した連接部30を介して接続部29と連接した実装用の実装部28とを設けたコの字形状であって、2つの端子27をリングコア26の外方から相対向する端面に位置するように取り付けている。
【0007】
【発明が解決しようとする課題】
上記従来の構成では、端子27は接続部29と連接部30を介して連接した実装部28とを有したコの字形状としており、実装基板への実装時には、このコの字形状の端子27の実装部28を実装基板の配線パターンのランドに載置して半田接続することになる。
【0008】
一般に実装基板において配線パターンのランドが配置される位置は、使用者によって様々な位置に配置されることが多い。
【0009】
このような場合、上記従来の構成では端子27がコの字形状であるので、使用者においてランドの位置が互いに異なる場合には、その都度、リングコア26に対する端子27の取付位置を変更する必要が生じる。このとき、リングコア26の形状が角柱形状の場合は、実装基板における他の部品の取付位置との関係から、取付方向(縦、横、斜め方向等)が規制されることがあるので、リングコア26の取付方向を変更せずに、端子27の取付位置のみを変更することによって、ランドの異なった位置に対応する必要がある。
【0010】
よって、端子27のリングコア26への取付位置の変更が必要な場合は、生産性が低下するとともに、取付位置の変更に起因して取付信頼性が低下するという問題点を有していた。
【0011】
本発明は上記問題点を解決し、生産性および端子の取付信頼性を向上したチョークコイルを提供することを目的としている。
【0012】
【課題を解決するための手段】
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。
【0013】
本発明の請求項1に記載の発明は、特に、リングコアの少なくとも2つの角部にはテーパ状に面取りしたテーパ部を設けるとともに、端子は、テーパ部に配置し巻線と接続した接続部と、リングコアの角部間の外周面に配置した連接部と、この連接部を介して接続部と連接し、リングコア下面に配置した実装部とを有し、実装部をリングコアの下面の隣接する角部間に配置した構成である。
【0014】
上記構成により、端子にはリングコアの角部間の外周面に配置した連接部を設けているので、接続部の下方に対向する位置に実装部が位置するのではなく、リングコアの角部間の外周面に配置した連接部の寸法分だけ位置ずれしている。つまり、ランドの位置に対応するようにこの連接部の寸法を予め調整した端子を接続部の位置を基準にしてリングコアに取り付けるようにすれば、接続部と実装部との互いの位置関係を自由に設定できるので、リングコアの取付方向を変更せずに、しかも、端子の取付位置も変更せずに、ランドの異なった位置に対応することができる。
【0015】
特に、接続部をリングコアの角部に設けたテーパ部に配置するので、この接続部と巻線とは一般的に半田接続が施されているが、半田の付着量に起因した寸法増加もチョークコイル全体としての縦横の外形寸法に影響することを防止できる。
本発明の請求項2の発明は、請求項1に記載の発明において、特に、接続部の下側稜線とリングコアの下面との間に、リングコアの外周面を接続部から露出させる隙間部を形成した構成である。
【0016】
上記構成により、接続部の下側稜線と前記リングコアの下面との間に隙間部を形成しているので、実装部と実装基板のランドとが半田接続された際、この半田が表面張力等により実装部から接続部へ付着するとともに、接続部への付着に起因してリングコアの下面と外周面との境界近傍に沿って半田が付着し廻り込むことを防止できる。
【0017】
特に、リングコアの下面と外周面との境界近傍に沿って半田は付着し易く、この場合リングコアとドラムコアとの間に形成されるギャップ部(空間部)にも半田が浸透して、チョークコイルとして重畳特性を低下させる恐れがあるが、上記構成によりこの重畳特性の低下を防止できる。
【0018】
本発明の請求項3に記載の発明は、請求項2に記載の発明において、特に、隙間部をテーパ状に面取りした構成である。上記構成により、端子の実装部近傍の接続部の下側稜線に露出するリングコアの外周面がテーパ状に面取りされることになり、実装部に付着した半田がリングコアの外周面に付着することを抑制し、半田の接続部への付着に起因してリングコアの下面と外周面との境界近傍に沿うように半田が付着し廻り込むことをより防止できる。
【0019】
本発明の請求項4に記載の発明は、請求項1に記載の発明において、特に、実装部の長さはリングコアの外周からドラムコアに向かって前記ドラムコアの鍔に達する長さとした構成である。上記構成により、実装部の長さはドラムコアの鍔に達する長さとしているので、衝撃等によってドラムコアがリングコアから脱落することを防止できる。
【0020】
本発明の請求項5に記載の発明は、請求項1に記載の発明において、特に、実装部はリングコアの下面の隣接する角部間の中央に配置した構成である。上記方法により、実装部は角部のテーパ部に隣接せずに一定の間隔をもって配置されることになり、半田の連接部への付着に起因してリングコアの下面と外周面との境界近傍に沿うように半田が付着し廻り込むことをより防止できる。
【0021】
本発明の請求項6に記載の発明は、請求項1に記載の発明において、特に、テーパ部の上面に溝部を設け、前記溝部から巻線を引き出して端子の接続部と接続した構成である。上記構成により、巻線の引き出しが容易になるとともに、線径の異なる巻線を用いても、溝部によって容易に引き出すことができる。
【0022】
本発明の請求項7に記載の発明は、請求項1に記載の発明において、特に、ドラムコアの上端の鍔と、前記鍔に対向するリングコアとの間に接着剤を塗布して前記リングコアと前記ドラムコアとを接着した構成である。上記構成により、ドラムコアの下面に接着剤を付着させずに、リングコアとドラムコアとを保持でき、ドラムコアの下面の平坦性が損なわれ、実装性が低下することを防止できる。
【0023】
本発明の請求項8に記載の発明は、請求項1に記載の発明において、特に、端子の厚さを同一にするとともに、連接部の最小の幅は実装部の幅以上にした構成である。上記構成により、非常に小さい外形寸法であって、高周波回路に用いる場合、特に、10ミリ角以下で、巻線の直径が1ミリ以下のような微小インダクタンス値(数nH)で機能させる際は、端子の連接部の長さに起因して直流抵抗が増大し、発熱等のエネルギー損失を受け易いが、連接部の最小の幅を実装部の幅以上にすることにより、直流抵抗を増大させずエネルギー損失を抑制することができる。
【0024】
【発明の実施の形態】
以下、本発明の一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。
【0025】
図1は本発明の一実施の形態におけるチョークコイルの下面から見た斜視図、図2は同チョークコイルの上面から見た斜視図、図3は同チョークコイルの図1におけるA−A断面図、図4は同チョークコイルの正面図、図5は同チョークコイルの上面図、図6は同チョークコイルの下面図、図7は同チョークコイルの製造工程図である。
【0026】
図1〜図6において、本発明の一実施の形態におけるチョークコイルは、巻軸部1の上下端に鍔2を有したドラムコア3と、このドラムコア3の巻軸部1に巻回した巻線5と、このドラムコア3を内包し4つの角部を有した角柱形状のリングコア4と、このリングコア4に取り付けるとともに巻線5と電気的接続をした端子6とを備えている。
【0027】
また、リングコア4の4つの角部の内の相対向する2つの角部には、テーパ状に面取りし、巻線5を引き出して端子6と接続するための溝部7を上面に形成したテーパ部8を設けるとともに、端子6には、テーパ部8に配置し巻線5と接続する接続部9と、リングコア4の角部間の外周面に配置した連接部10を介してリングコア4の下面に配置された実装用の実装部11とを設けている。
【0028】
この端子6は、接続部9、連接部10、実装部11の厚さを同一にするとともに、連接部10の最小の幅(W1)を実装部11の幅(W2)よりも小さくし、実装部11はリングコア4の外周からドラムコア3に向かってドラムコア3の鍔2に達する長さにするとともに、リングコア4の下面の隣接する角部間の中央に配置し、リングコア4と端子6の実装部11との間に接着剤13を塗布している。
【0029】
さらに、リングコア4の外周面を接続部9から露出させるように接続部9の下側稜線とリングコア4の下面との間に隙間部12を形成するとともに、隙間部12をテーパ状に面取りしている。
【0030】
そして、ドラムコア3の上端の鍔2と、前記鍔2に対向するリングコア4との間に接着剤13を塗布して、リングコア4とドラムコア3とを接着している。
【0031】
上記チョークコイルを製造する製造方法は図7に示す通りである。
【0032】
第1に、平板状の金属フレーム14に連接した同一の厚さのフープ端子15を図7(a)に示すようにリングコア4の外周面から下面に向かってL字形状に折曲し、図7(b)に示すようにフープ端子15にL字部16を形成して巻線5と接続するための接続部9と、リングコア4の下面の隣接する角部間の中央に配置するとともに、リングコア4の角部間の外周面に配置する連接部10と、連接部10を介して接続部9と連接する実装用の実装部11とを有した端子6を形成する。
【0033】
このとき、同時に図1に示す連接部10の最小の幅(W1)と実装部11の幅(W2)を所定寸法にする工程と、実装部11の長さ(T1)をリングコア4の外周からドラムコア3に向かってドラムコア3の鍔2に達する長さとする工程とを設けている。
【0034】
第2に、角部を有した角柱形状であって外周面の下面側にテーパ状に面取りし、上面に溝部7を有するテーパ部8を設けたリングコア4を図7(c)に示すように端子6の接続部9の下側稜線とリングコア4の下面との間に、面取りした部分が露出して隙間部12を形成するように、折曲した端子6上に載置している。
【0035】
第3に、図7(d)に示すように巻軸部1に巻線5を巻回したドラムコア3をリングコア4に内包して配置している。第4に、ドラムコア3の上端の鍔2と、この鍔2に対向するリングコア4との間に接着剤13を塗布して、リングコア4とドラムコア3とを接着している。第5に、巻線5を溝部7から引き出して端子6と接続している。
【0036】
第6に、フープ端子15を金属フレーム14から切断し、図7(e)に示すようにチョークコイルを個片に分離している。
【0037】
最後に、このようにして製造されたチョークコイルを実装基板の配線パターンのランドに端子6の実装部11によって半田接続して実装している。
【0038】
上記構成および製造方法によれば、端子6には、リングコア4の角部間の外周面に配置した連接部10を設けているので、接続部9の下方に対向する位置に実装部11が位置するのではなく、リングコア4の角部間の外周面に配置した連接部10の寸法(T2)だけ位置ずれする。
【0039】
つまり、ランドの位置に対応するようにこの連接部10の寸法(T2)を予め調整した端子6をリングコア4に取り付けるようにすれば、接続部9と実装部11との互いの位置関係を自由に設定できるので、リングコア4の取付方向(チョークコイルの取付方向)を変更せずに、しかも、端子6の取付位置も変更せずにランドの異なった位置に対応することができる。
【0040】
特に、接続部9をリングコア4の角部に設けたテーパ部8に配置するので、この接続部9と巻線5とは一般的に半田接続が施されているが、半田の付着量に起因して寸法増加しても、チョークコイル全体としての縦横の外形寸法に影響することを防止できる(半田の付着量に起因した寸法増加はテーパ部8によって吸収される)。
【0041】
また、接続部9の下側稜線と前記リングコア4の下面との間に隙間部12を形成しているので、実装部11と実装基板のランドとが半田接続された際、この半田が表面張力等により実装部11から接続部9へ付着するとともに、接続部9への付着に起因してリングコア4の下面と外周面との境界近傍に沿って半田が付着し廻り込むことを防止できる。
【0042】
特に、リングコア4の下面と外周面との境界近傍に沿って半田は付着し易く、この場合、チョークコイルとして、リングコア4とドラムコア3との間に形成されるギャップ部(空間部)にも半田が浸透して、重畳特性を低下させる恐れがあるが、上記構成によりこの重畳特性の低下を防止できる。
【0043】
さらに、端子6の実装部11近傍の接続部9の下側稜線に露出するリングコア4の外周面がテーパ状に面取りされることになり、実装部11に付着した半田がリングコア4の外周面に付着することを抑制し、半田の接続部9への付着に起因してリングコア4の下面と外周面との境界近傍に沿うように半田が付着し廻り込むことをより防止できる。
【0044】
この際、実装部11は角部のテーパ部8に隣接せずに一定の間隔をもって配置されるので、半田の接続部9への付着に起因してリングコア4の下面と外周面との境界近傍に沿うように半田が付着し廻り込むことをより一層防止できるとともに、実装部11の長さ(T1)はドラムコア3の鍔2に達する長さとしているので、衝撃等によってドラムコア3がリングコア4から脱落することを防止できる。
【0045】
そして、テーパ部8の上面に溝部7を設け、この溝部7から巻線5を引き出して端子6の接続部9と接続しているので、線径の異なる巻線5を用いても溝部7によって容易に引き出すことができるとともに、ドラムコア3の上端の鍔2とこの鍔2に対向するリングコア4との間に接着剤13を塗布して接着しているので、ドラムコア3の下面に接着剤13を付着させずにリングコア4とドラムコア3とを保持でき、ドラムコア3の下面の平坦性が損なわれ実装性が低下することを防止できる。
【0046】
なお、端子6の厚さを同一にするとともに、連接部10の最小の幅(W1)は実装部11の幅(W2)以にしているので、非常に小さい外形寸法であって高周波回路に用いる場合、特に、10ミリ角以下で、巻線5の直径が1ミリ以下のような微小インダクタンス値(数nH)で機能させる際は、端子6の連接部10の長さに起因して直流抵抗が増大し、発熱等のエネルギー損失を受け易いが、連接部10の最小の幅(W1)を実装部11の幅(W2)以上にすることにより直流抵抗を増大させずエネルギー損失を抑制することができる。
【0047】
このように本発明の一実施の形態によれば、チョークコイル自体の取付方向およびリングコア4への端子6の取付位置を変更せずに、ランドの異なった位置に対応することができるとともに、実装性、巻線5配線の簡易性を低下させることもなく、生産性および端子6の取付信頼性を向上できる。
【0048】
特に、接続部9と巻線5との半田接続に起因してチョークコイル全体の外形寸法が影響を受けることがなく小型化もできるとともに、実装部11とランドとの半田接続に起因してリングコア4とドラムコア3との間に形成されるギャップ部(空間部)に半田が浸透し、重畳特性を低下させることもない。
【0049】
なお、本発明の一実施の形態によれば、連接部10の最小の幅(W1)が実装部11の幅(W2)よりも小さいが、連接部10の最小の幅(W1)を実装部11の幅(W2)以上にしてもよい。
【0050】
一般に、非常に小さい外形寸法であって高周波回路に用いる場合、特に、10ミリ角以下で巻線5の直径が1ミリ以下のような微小インダクタンス値(数nH)で機能させる際は、端子6の連接部10の最小の幅(W1)に起因して直流抵抗が増大し、発熱等のエネルギー損失を受け易いが、連接部10の最小の幅(W1)を実装部11の幅(W2)以上にすることにより、直流抵抗を増大させずエネルギー損失を抑制することができる。
【0051】
【発明の効果】
以上のように本発明によれば、端子にはリングコアの角部間の外周面に配置した連接部を設けているので、接続部の下方に対向する位置に実装部が位置するのではなく、リングコアの角部間の外周面に配置した連接部の寸法分だけ位置ずれする、すなわち、ランドの位置に対応するようにこの連接部の寸法を予め調整した端子をリングコアに取り付けるようにすれば、接続部と実装部との互いの位置関係を自由に設定できる。
【0052】
この結果、チョークコイル自体の取付方向およびリングコアへの端子の取付位置を変更せずに、ランドの異なった位置に対応することができ、生産性および端子の取付信頼性を向上したチョークコイルを提供できる。
【0053】
特に、接続部をリングコアの角部に設けたテーパ部に配置するので、この接続部と巻線とは一般的に半田接続が施されているが、半田の付着量に起因した寸法増加もチョークコイル全体としての縦横の外形寸法に影響することを防止できる(半田の付着量に起因した寸法増加はテーパ部によって吸収される)。
【図面の簡単な説明】
【図1】本発明の一実施の形態におけるチョークコイルの下面から見た斜視図
【図2】同チョークコイルの上面から見た斜視図
【図3】同チョークコイルの図1におけるA−A断面図
【図4】同チョークコイルの正面図
【図5】同チョークコイルの上面図
【図6】同チョークコイルの下面図
【図7】(a)〜(e)同チョークコイルの製造工程図
【図8】従来のチョークコイルの斜視図
【図9】同チョークコイルの分解斜視図
【符号の説明】
1 巻軸部
2 鍔
3 ドラムコア
4 リングコア
5 巻線
6 端子
7 溝部
8 テーパ部
9 接続部
10 連接部
11 実装部
12 隙間部
13 接着剤
14 金属フレーム
15 フープ端子
16 L字部
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a choke coil used for various electronic devices and the like.
[0002]
[Prior art]
Hereinafter, a conventional choke coil will be described with reference to the drawings.
[0003]
FIG. 8 is a perspective view of a conventional choke coil, and FIG. 9 is an exploded perspective view of the choke coil.
[0004]
8 and 9, the conventional choke coil has an upper end flange 22 at one end of the winding shaft portion 21, and a lower end flange 23 having a diameter substantially equal to the diameter of the upper end flange 22 at the other end of the winding shaft portion 21. A drum core 24, a winding 25 wound around the winding shaft portion 21 of the drum core 24, a columnar space containing the drum core 24, and a prismatic ring core 26 having four corners; A terminal 27 attached to the ring core 26 and electrically connected to the winding 25 is provided.
[0005]
A gap portion is provided between the drum core 24 and the ring core 26, and an adhesive is applied to the gap portion to bond the drum core 24 and the ring core 26 together.
[0006]
Further, the terminal 27 engages with the upper surface of the opposite end faces of the ring core 26 and connects to the winding 25, and engages with the lower face of both end faces of the ring core 26 and is disposed on the outer peripheral surface of the ring core 26. The mounting portion 28 for mounting connected to the connecting portion 29 via the connecting portion 30 is provided in a U-shape so that the two terminals 27 are located on the opposite end faces from the outside of the ring core 26. It is attached to.
[0007]
[Problems to be solved by the invention]
In the above-described conventional configuration, the terminal 27 has a U-shape having a connecting portion 29 and a mounting portion 28 connected via a connecting portion 30, and this U-shaped terminal 27 is mounted on a mounting board. The mounting portion 28 is placed on the land of the wiring pattern of the mounting substrate and soldered.
[0008]
In general, the position where the land of the wiring pattern is arranged on the mounting board is often arranged at various positions by the user.
[0009]
In such a case, since the terminal 27 has a U-shape in the above-described conventional configuration, if the position of the land is different for the user, it is necessary to change the mounting position of the terminal 27 with respect to the ring core 26 each time. Arise. At this time, if the shape of the ring core 26 is a prismatic shape, the mounting direction (vertical, horizontal, diagonal direction, etc.) may be restricted due to the relationship with the mounting position of other components on the mounting board. It is necessary to cope with different positions of the land by changing only the mounting position of the terminal 27 without changing the mounting direction.
[0010]
Therefore, when it is necessary to change the attachment position of the terminal 27 to the ring core 26, the productivity is lowered, and the attachment reliability is lowered due to the change of the attachment position.
[0011]
An object of the present invention is to provide a choke coil which solves the above-described problems and has improved productivity and terminal mounting reliability.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has the following configuration.
[0013]
According to the first aspect of the present invention, in particular, at least two corners of the ring core are provided with tapered portions chamfered in a tapered shape, and the terminals are arranged in the tapered portions and connected to the windings. A connecting portion disposed on the outer peripheral surface between the corner portions of the ring core, and a mounting portion that is connected to the connecting portion via the connecting portion and disposed on the lower surface of the ring core, and the mounting portion is adjacent to the lower surface of the ring core. It is the structure arrange | positioned between parts.
[0014]
With the above configuration, since the terminal is provided with a connecting portion arranged on the outer peripheral surface between the corner portions of the ring core, the mounting portion is not located at a position facing the lower side of the connecting portion, but between the corner portions of the ring core. The position is shifted by the dimension of the connecting portion arranged on the outer peripheral surface. In other words, if a terminal whose dimensions of the connecting portion are adjusted in advance so as to correspond to the position of the land is attached to the ring core based on the position of the connecting portion, the positional relationship between the connecting portion and the mounting portion can be freely set. Therefore, it is possible to cope with different positions of the land without changing the mounting direction of the ring core and without changing the mounting position of the terminal.
[0015]
In particular, since the connecting portion is arranged in a tapered portion provided at the corner of the ring core, the connecting portion and the winding are generally connected by soldering, but the increase in dimension due to the amount of attached solder is also choked. It is possible to prevent influence on the vertical and horizontal outer dimensions of the entire coil.
According to a second aspect of the present invention, in the first aspect of the present invention, in particular, a gap that exposes the outer peripheral surface of the ring core from the connection portion is formed between the lower ridge line of the connection portion and the lower surface of the ring core. This is the configuration.
[0016]
With the above configuration, a gap is formed between the lower ridge line of the connection portion and the lower surface of the ring core. Therefore, when the mounting portion and the land of the mounting substrate are soldered, this solder is caused by surface tension or the like. In addition to adhering from the mounting part to the connection part, it is possible to prevent the solder from adhering to the vicinity of the boundary between the lower surface and the outer peripheral surface of the ring core due to adhesion to the connection part.
[0017]
In particular, solder tends to adhere along the vicinity of the boundary between the lower surface and the outer peripheral surface of the ring core. In this case, the solder also penetrates into the gap portion (space portion) formed between the ring core and the drum core as a choke coil. Although there is a risk of deteriorating the superimposition characteristic, the above configuration can prevent the superimposition characteristic from deteriorating.
[0018]
Invention of Claim 3 of this invention is the structure which chamfered the clearance gap part in the invention of Claim 2 especially in the taper shape. With the above configuration, the outer peripheral surface of the ring core exposed at the lower ridge line of the connection portion in the vicinity of the mounting portion of the terminal is chamfered in a tapered shape, and the solder attached to the mounting portion adheres to the outer peripheral surface of the ring core. Thus, it is possible to prevent the solder from adhering to the vicinity of the boundary between the lower surface and the outer peripheral surface of the ring core due to the adhesion of the solder to the connection portion.
[0019]
According to a fourth aspect of the present invention, in the first aspect of the present invention, in particular, the length of the mounting portion is a length that reaches the flange of the drum core from the outer periphery of the ring core toward the drum core. With the above configuration, the length of the mounting portion reaches the length of the drum core, so that the drum core can be prevented from falling off the ring core due to impact or the like.
[0020]
The invention according to claim 5 of the present invention is the structure according to claim 1, in which the mounting portion is particularly arranged at the center between the adjacent corners of the lower surface of the ring core. According to the above method, the mounting portion is not disposed adjacent to the taper portion at the corner portion but is arranged at a constant interval, and due to the adhesion of the solder to the connecting portion, in the vicinity of the boundary between the lower surface of the ring core and the outer peripheral surface. It is possible to further prevent the solder from adhering along the line.
[0021]
The invention according to claim 6 of the present invention is the configuration according to claim 1, in which a groove portion is provided on the upper surface of the taper portion, and the winding is drawn out from the groove portion and connected to the connection portion of the terminal. . With the above configuration, the winding can be easily pulled out, and even when windings having different wire diameters are used, the winding can be easily pulled out.
[0022]
The invention according to claim 7 of the present invention is the invention according to claim 1, and in particular, an adhesive is applied between the flange at the upper end of the drum core and the ring core facing the flange to The drum core is bonded to the drum core. With the above configuration, the ring core and the drum core can be held without attaching an adhesive to the lower surface of the drum core, and the flatness of the lower surface of the drum core can be impaired, thereby preventing the mountability from being lowered.
[0023]
The invention according to claim 8 of the present invention is the configuration according to claim 1, in particular, the thickness of the terminals is the same, and the minimum width of the connecting portion is equal to or larger than the width of the mounting portion. . With the above configuration, when used in a high frequency circuit with a very small external dimension, particularly when functioning with a very small inductance value (several nH) such that the diameter of the winding is 10 mm square or less and the winding diameter is 1 mm or less. The direct current resistance increases due to the length of the connecting part of the terminal, and it is easy to receive energy loss such as heat generation, but by increasing the minimum width of the connecting part over the width of the mounting part, the direct current resistance is increased. It is possible to suppress energy loss.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0025]
1 is a perspective view of a choke coil according to an embodiment of the present invention as viewed from the bottom surface, FIG. 2 is a perspective view of the choke coil as viewed from the top surface, and FIG. 3 is a cross-sectional view of the choke coil taken along line AA in FIG. 4 is a front view of the choke coil, FIG. 5 is a top view of the choke coil, FIG. 6 is a bottom view of the choke coil, and FIG. 7 is a manufacturing process diagram of the choke coil.
[0026]
1 to 6, a choke coil according to an embodiment of the present invention includes a drum core 3 having hooks 2 at the upper and lower ends of a winding shaft portion 1 and a winding wound around the winding shaft portion 1 of the drum core 3. 5, a ring-shaped ring core 4 having four corners and including the drum core 3, and a terminal 6 attached to the ring core 4 and electrically connected to the winding 5.
[0027]
Further, two opposite corner portions of the four corner portions of the ring core 4 are tapered and chamfered in a tapered shape, and a groove portion 7 is formed on the upper surface so that the winding 5 is pulled out and connected to the terminal 6. 8 is provided on the lower surface of the ring core 4 via the connecting portion 9 disposed on the outer peripheral surface between the corner portions of the ring core 4 and the connection portion 9 disposed on the tapered portion 8 and connected to the winding 5. A mounting portion 11 for mounting is provided.
[0028]
In this terminal 6, the connecting portion 9, the connecting portion 10, and the mounting portion 11 have the same thickness, and the minimum width (W1) of the connecting portion 10 is made smaller than the width (W2) of the mounting portion 11 to mount the terminal 6. The portion 11 has a length that reaches the flange 2 of the drum core 3 from the outer periphery of the ring core 4 toward the drum core 3, and is disposed at the center between adjacent corners on the lower surface of the ring core 4. 11 is applied with an adhesive 13.
[0029]
Further, a gap 12 is formed between the lower ridge line of the connection portion 9 and the lower surface of the ring core 4 so that the outer peripheral surface of the ring core 4 is exposed from the connection portion 9, and the gap 12 is chamfered in a tapered shape. Yes.
[0030]
The ring core 4 and the drum core 3 are bonded together by applying an adhesive 13 between the flange 2 at the upper end of the drum core 3 and the ring core 4 facing the flange 2.
[0031]
A manufacturing method for manufacturing the choke coil is as shown in FIG.
[0032]
First, a hoop terminal 15 having the same thickness connected to the flat metal frame 14 is bent into an L shape from the outer peripheral surface of the ring core 4 to the lower surface as shown in FIG. As shown in FIG. 7B, the L-shaped portion 16 is formed in the hoop terminal 15 and arranged at the center between the adjacent corner portions on the lower surface of the ring core 4 and the connection portion 9 for connecting to the winding 5. A terminal 6 having a connecting part 10 disposed on the outer peripheral surface between the corners of the ring core 4 and a mounting part 11 for mounting connected to the connecting part 9 through the connecting part 10 is formed.
[0033]
At the same time, the step of setting the minimum width (W1) of the connecting portion 10 and the width (W2) of the mounting portion 11 shown in FIG. 1 to predetermined dimensions, and the length (T1) of the mounting portion 11 from the outer periphery of the ring core 4 And a step of setting the length to reach the flange 2 of the drum core 3 toward the drum core 3.
[0034]
Secondly, as shown in FIG. 7 (c), a ring core 4 having a prismatic shape having a corner portion, chamfered in a tapered shape on the lower surface side of the outer peripheral surface, and provided with a tapered portion 8 having a groove portion 7 on the upper surface. Between the lower ridge line of the connecting portion 9 of the terminal 6 and the lower surface of the ring core 4, the chamfered portion is placed on the bent terminal 6 so that a gap portion 12 is formed by exposure.
[0035]
Thirdly, as shown in FIG. 7 (d), the drum core 3 in which the winding 5 is wound around the winding shaft portion 1 is disposed inside the ring core 4. Fourth, the ring core 4 and the drum core 3 are bonded together by applying an adhesive 13 between the flange 2 at the upper end of the drum core 3 and the ring core 4 facing the flange 2. Fifth, the winding 5 is pulled out from the groove 7 and connected to the terminal 6.
[0036]
Sixth, the hoop terminal 15 is cut from the metal frame 14, and the choke coil is separated into individual pieces as shown in FIG.
[0037]
Finally, the choke coil manufactured in this manner is mounted on the land of the wiring pattern of the mounting board by soldering using the mounting portion 11 of the terminal 6.
[0038]
According to the configuration and the manufacturing method described above, since the terminal 6 is provided with the connecting portion 10 disposed on the outer peripheral surface between the corner portions of the ring core 4, the mounting portion 11 is located at a position facing the lower side of the connecting portion 9. Instead, the position is displaced by the dimension (T2) of the connecting portion 10 arranged on the outer peripheral surface between the corner portions of the ring core 4.
[0039]
That is, if the terminal 6 whose dimension (T2) of the connecting portion 10 is adjusted in advance so as to correspond to the land position is attached to the ring core 4, the positional relationship between the connecting portion 9 and the mounting portion 11 can be freely set. Therefore, it is possible to cope with different positions of the land without changing the mounting direction of the ring core 4 (mounting direction of the choke coil) and without changing the mounting position of the terminal 6.
[0040]
In particular, since the connecting portion 9 is disposed on the tapered portion 8 provided at the corner of the ring core 4, the connecting portion 9 and the winding 5 are generally connected by soldering. Even if the size is increased, it is possible to prevent the overall vertical and horizontal dimensions of the choke coil from being affected (the increase in size due to the amount of solder attached is absorbed by the taper portion 8).
[0041]
Further, since the gap portion 12 is formed between the lower ridge line of the connection portion 9 and the lower surface of the ring core 4, when the mounting portion 11 and the land of the mounting substrate are solder-connected, this solder has surface tension. Thus, it is possible to prevent the solder from adhering along the vicinity of the boundary between the lower surface and the outer peripheral surface of the ring core 4 due to the adhesion to the connection portion 9 due to the adhesion to the connection portion 9 from the mounting portion 11.
[0042]
In particular, the solder is likely to adhere along the vicinity of the boundary between the lower surface and the outer peripheral surface of the ring core 4. In this case, the solder is also soldered to a gap portion (space portion) formed between the ring core 4 and the drum core 3 as a choke coil. May deteriorate the superimposition characteristic, but the above configuration can prevent the superimposition characteristic from deteriorating.
[0043]
Furthermore, the outer peripheral surface of the ring core 4 exposed at the lower ridge line of the connection portion 9 in the vicinity of the mounting portion 11 of the terminal 6 is chamfered in a tapered shape, and the solder attached to the mounting portion 11 is applied to the outer peripheral surface of the ring core 4. It is possible to suppress the adhesion and more prevent the solder from adhering to the vicinity of the boundary between the lower surface and the outer peripheral surface of the ring core 4 due to the adhesion of the solder to the connection portion 9.
[0044]
At this time, since the mounting portion 11 is not adjacent to the corner taper portion 8 and is disposed at a constant interval, the vicinity of the boundary between the lower surface and the outer peripheral surface of the ring core 4 due to the adhesion of the solder to the connection portion 9 Further, it is possible to further prevent the solder from adhering along and extending around, and the length (T1) of the mounting portion 11 reaches the flange 2 of the drum core 3, so that the drum core 3 is separated from the ring core 4 by an impact or the like. It can be prevented from falling off.
[0045]
And since the groove part 7 is provided in the upper surface of the taper part 8, and the coil | winding 5 is pulled out from this groove part 7 and it connects with the connection part 9 of the terminal 6, even if it uses the coil | winding 5 from which a wire diameter differs, the groove part 7 is used. Since the adhesive 13 is applied and bonded between the flange 2 at the upper end of the drum core 3 and the ring core 4 facing the flange 2, the adhesive 13 can be applied to the lower surface of the drum core 3. The ring core 4 and the drum core 3 can be held without being attached, and the flatness of the lower surface of the drum core 3 can be prevented from being deteriorated and the mountability can be prevented from being lowered.
[0046]
Incidentally, with the thickness of the terminal 6 to the same, since the minimum width of the connecting portion 10 (W1) is the width (W2) hereinafter of mounting portion 11, a very small outer dimensions to a high-frequency circuit When it is used, particularly when it is made to function with a small inductance value (several nH) such that the diameter of the winding 5 is 10 mm square or less and the diameter of the winding 5 is 1 mm or less, direct current is caused by the length of the connecting portion 10 of the terminal 6. Although resistance increases and it is easy to receive energy loss, such as heat_generation | fever, it suppresses energy loss without increasing direct current resistance by making the minimum width (W1) of the connection part 10 more than the width | variety (W2) of the mounting part 11. be able to.
[0047]
As described above, according to the embodiment of the present invention, the mounting direction of the choke coil itself and the mounting position of the terminal 6 to the ring core 4 can be changed without changing the mounting position of the land. The productivity and the mounting reliability of the terminals 6 can be improved without degrading the performance and the simplicity of the winding 5 wiring.
[0048]
In particular, the outer dimensions of the entire choke coil are not affected by the solder connection between the connection portion 9 and the winding 5 and can be reduced in size, and the ring core is caused by the solder connection between the mounting portion 11 and the land. Solder penetrates into the gap (space) formed between 4 and the drum core 3, and the superposition characteristics are not deteriorated.
[0049]
According to the embodiment of the present invention, the minimum width (W1) of the connecting portion 10 is smaller than the width (W2) of the mounting portion 11, but the minimum width (W1) of the connecting portion 10 is set to the mounting portion. The width may be 11 or more (W2).
[0050]
In general, when used in a high frequency circuit having a very small external dimension, the terminal 6 is used particularly when the function is performed with a very small inductance value (several nH) such that the diameter of the winding 5 is 1 mm or less with a diameter of 10 mm or less. DC resistance increases due to the minimum width (W1) of the connecting portion 10 and is susceptible to energy loss such as heat generation, but the minimum width (W1) of the connecting portion 10 is reduced to the width (W2) of the mounting portion 11. By doing so, energy loss can be suppressed without increasing the DC resistance.
[0051]
【The invention's effect】
As described above, according to the present invention, since the terminal is provided with the connecting portion disposed on the outer peripheral surface between the corner portions of the ring core, the mounting portion is not located at a position facing the lower portion of the connecting portion, If the terminal is displaced by the dimension of the connecting part arranged on the outer peripheral surface between the corners of the ring core, that is, the terminal whose dimension of this connecting part is adjusted in advance so as to correspond to the position of the land, The mutual positional relationship between the connection part and the mounting part can be freely set.
[0052]
As a result, there is no need to change the mounting direction of the choke coil itself and the mounting position of the terminal to the ring core, and the choke coil can be adapted to different positions on the land, improving productivity and terminal mounting reliability. it can.
[0053]
In particular, since the connecting portion is arranged in a tapered portion provided at the corner of the ring core, the connecting portion and the winding are generally connected by soldering, but the increase in dimension due to the amount of attached solder is also choked. It is possible to prevent influence on the vertical and horizontal outer dimensions of the coil as a whole (the increase in dimension due to the amount of attached solder is absorbed by the taper portion).
[Brief description of the drawings]
1 is a perspective view of a choke coil as viewed from the bottom according to an embodiment of the present invention. FIG. 2 is a perspective view of the choke as viewed from the top. FIG. Fig. 4 Front view of the choke coil Fig. 5 Top view of the choke coil Fig. 6 Bottom view of the choke coil Fig. 7 (a) to (e) Manufacturing process diagram of the choke coil FIG. 8 is a perspective view of a conventional choke coil. FIG. 9 is an exploded perspective view of the choke coil.
DESCRIPTION OF SYMBOLS 1 Winding shaft part 2 鍔 3 Drum core 4 Ring core 5 Winding 6 Terminal 7 Groove part 8 Tapered part 9 Connection part 10 Connection part 11 Mounting part 12 Gap part 13 Adhesive 14 Metal frame 15 Hoop terminal 16 L-shaped part

Claims (8)

巻軸部上下端に鍔を有したドラムコアと、このドラムコアの巻軸部に巻回した巻線と、前記ドラムコアを内包し角部を有した角柱形状のリングコアと、このリングコアに取り付けるとともに前記巻線と電気的接続をした端子とを備え、前記リングコアの少なくとも2つの角部にはテーパ状に面取りしたテーパ部を設けるとともに、前記端子は、前記テーパ部に配置し前記巻線と接続した接続部と、前記リングコアの前記角部間の外周面に配置した連接部と、この連接部を介して前記接続部と連接し、前記リングコア下面に配置した実装部とを有し、前記実装部を前記リングコアの下面の隣接する角部間に配置したチョークコイル。A drum core having ridges at the upper and lower ends of the winding shaft portion, a winding wound around the winding shaft portion of the drum core, a prismatic ring core including the drum core and having a corner portion, and attached to the ring core and the winding And a terminal electrically connected to the wire, and at least two corners of the ring core are provided with tapered chamfered taper portions, and the terminals are arranged in the taper portions and connected to the windings. A connecting portion disposed on the outer peripheral surface between the corners of the ring core, and a mounting portion connected to the connecting portion via the connecting portion and disposed on the lower surface of the ring core, and the mounting portion A choke coil disposed between adjacent corners of the lower surface of the ring core. 前記接続部の下側稜線と前記リングコアの下面との間に、リングコアの外周面を接続部から露出させる隙間部を形成した請求項1に記載のチョークコイル。The choke coil according to claim 1, wherein a gap portion is formed between the lower ridge line of the connection portion and the lower surface of the ring core to expose the outer peripheral surface of the ring core from the connection portion . 隙間部をテーパ状に面取りした請求項2に記載のチョークコイル。  The choke coil according to claim 2, wherein the gap portion is chamfered in a tapered shape. 実装部の長さは、リングコアの外周からドラムコアに向かって前記ドラムコアの鍔に達する長さとした請求項1に記載のチョークコイル。  The choke coil according to claim 1, wherein a length of the mounting portion is a length that reaches a flange of the drum core from the outer periphery of the ring core toward the drum core. 実装部はリングコアの下面の隣接する角部間の中央に配置した請求項1に記載のチョークコイル。  The choke coil according to claim 1, wherein the mounting portion is disposed at a center between adjacent corner portions on the lower surface of the ring core. テーパ部の上面に溝部を設け、この溝部から巻線を引き出して端子の接続部と接続した請求項1に記載のチョークコイル。  The choke coil according to claim 1, wherein a groove portion is provided on the upper surface of the taper portion, and the winding is drawn out from the groove portion and connected to the terminal connection portion. ドラムコアの上端の鍔と、前記鍔に対向するリングコアとの間に接着剤を塗布して前記リングコアと前記ドラムコアとを接着した請求項1に記載のチョークコイル。  2. The choke coil according to claim 1, wherein an adhesive is applied between a flange at an upper end of the drum core and a ring core facing the flange to bond the ring core and the drum core. 端子の厚さを同一にするとともに、連接部の最小の幅は実装部の幅以上にした請求項1に記載のチョークコイル。  2. The choke coil according to claim 1, wherein the thicknesses of the terminals are the same, and the minimum width of the connecting portion is equal to or greater than the width of the mounting portion.
JP2001365849A 2001-11-30 2001-11-30 choke coil Expired - Fee Related JP3743358B2 (en)

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JP2003168608A JP2003168608A (en) 2003-06-13
JP3743358B2 true JP3743358B2 (en) 2006-02-08

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