JP3426564B2 - Surface mount choke coil - Google Patents
Surface mount choke coilInfo
- Publication number
- JP3426564B2 JP3426564B2 JP2000150096A JP2000150096A JP3426564B2 JP 3426564 B2 JP3426564 B2 JP 3426564B2 JP 2000150096 A JP2000150096 A JP 2000150096A JP 2000150096 A JP2000150096 A JP 2000150096A JP 3426564 B2 JP3426564 B2 JP 3426564B2
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- core
- winding
- choke coil
- drum core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000004804 winding Methods 0.000 claims description 31
- 239000000853 adhesive Substances 0.000 claims description 18
- 230000001070 adhesive effect Effects 0.000 claims description 18
- 229920003002 synthetic resin Polymers 0.000 claims description 18
- 239000000057 synthetic resin Substances 0.000 claims description 18
- 229920001187 thermosetting polymer Polymers 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 229910000679 solder Inorganic materials 0.000 description 11
- 230000000630 rising effect Effects 0.000 description 7
- 238000005476 soldering Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Coils Or Transformers For Communication (AREA)
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】この発明は、表面実装チョー
クコイルに関し、特に、ドラムコアおよびリングコアを
磁路とする表面実装コイルのＱを向上する端子片を具備
する表面実装チョークコイルに関する。
【０００２】
【従来の技術】表面実装チョークコイルの従来例を図２
および図３を参照して説明する。図２（ａ）は表面実装
チョークコイルの斜視図であり、図２（ｂ）は図２
（ａ）における線ｂ−ｂ’に沿った高さ方向断面を示す
図である。図３は図２の表面実装チョークコイルの分解
斜視図である。図２および図３において、１はリングコ
ア、２はドラムコア、３は巻線、４は端子を示す。これ
らリングコア１およびドラムコア２は電気抵抗の高い材
料であるフェライトにより構成されている。リングコア
１の側面はその一部に互いに対向する一対の平面部１２
が形成されている。互いに対向して一対の平面部１２に
隣接する円弧面部１３は、その下端部に切り欠き１１が
形成されている。
【０００３】ドラムコア２は一対の鍔部２１と、両鍔部
２１と一体に結合して両者を連結する捲芯部２２より成
る。この両鍔部２１はその一部に互いに対向する一対の
平坦部２１１が形成されている。ドラムコア２の捲芯部
２２に銅線が捲回されて巻線３が形成される。端子４は
その中央部に端子コア固定部４１が形成されている。そ
して、この端子４の一方の端部は先端を端子コア固定部
４１から少し屈曲してカラゲ半田部４２とされると共
に、他方の端部は直角に屈曲せしめて立ち上がり部４３
とされている。
【０００４】以上のリングコア１、ドラムコア２、巻線
３、および端子４を製造して準備する。ここで、図３
（ｂ）を参照するに、端子４は、端子コア固定部４１の
上面とドラムコア２の一方の鍔部２１の下面の間にエポ
キシ樹脂の如き熱硬化性合成樹脂接着剤を適用してこの
鍔部２１の下面に接合固定されている。この場合、端子
４の立ち上がり部４３をドラムコア２の両鍔部２１の平
坦部２１１に対向させて互に平行に接合固定する。次い
で、図３（ｃ）を参照するに、図３（ｂ）の如く構成さ
れたドラムコア２の捲芯部２２に銅線を捲回して巻線３
を形成する。巻線３の両巻線端部を端子４のカラゲ半田
部４２にカラゲ付ける。端子４のカラゲ半田部４２に巻
線３の巻線端部をカラゲ付けた状態において、カラゲ半
田部４２にリフロー半田付けを施して端子４と巻線３と
を電気機械的に完全に接続する。
【０００５】以上の通りに組み立てられたドラムコア
２、巻線３、端子４に対してリングコア１を嵌合する。
リングコア１を嵌合するに際して、リングコア１の円弧
面部１３下端の切り欠き１１をカラゲ半田部４２に対向
させると共に、平面部１２下端を端子４の立ち上がり部
４３に対応させて互いに平行にして嵌合する。端子４の
カラゲ半田部４２は半田付け後に屈曲せしめられるが、
切り欠き１１はこの屈曲せしめられたカラゲ半田部４２
を収容領域を構成する。なお、巻線３を含むドラムコア
２は熱収縮性チューブにより被覆されてリングコア１に
収容されるので、間隙５は実質上熱収縮性チューブによ
り充填された状態になる。
【０００６】
【発明が解決しようとする課題】上述した従来例におい
て、端子４は、端子コア固定部４１の面積を大きく設計
し、ドラムコア２の鍔部２１の下面に対する接合面積を
大きくしてドラムコア２の鍔部２１に対する大なる接合
強度を確保しようとしている。即ち、端子４は、大面積
の端子コア固定部４１全体がドラムコア２の鍔部２１の
下面に係合し、この相互係合面に熱硬化性合成樹脂接着
剤を適用して両者間の接合部を構成している。そして、
この接合部は、チョークコイルを表面実装するに際し
て、端子コア固定部４１の下面が高温の溶融半田に直接
接触して高温に曝され、端子コア固定部４１の上面とド
ラムコア２の鍔部２１の下面の間に存在する熱硬化性合
成樹脂接着剤に大きな熱ストレスが加えられる。熱硬化
性合成樹脂接着剤はこの大きな熱ストレスにより存する
ことがある。
【０００７】そして、端子コア固定部４１とドラムコア
２の鍔部２１の間を接合するに際して、接合部が大面積
であるところから、接合部に適用する熱硬化性合成樹脂
接着剤量の管理が一様になされず、端子コア固定部４１
とドラムコア２の鍔部２１の間における接着剤の分布を
製品毎に同様にすることが困難であるので、製品毎の接
合強度にバラツキが生ずる。また、端子４の端子コア固
定部４１がドラムコア２の鍔部２１に接合面積を大きく
して接合部を構成している表面実装チョークコイルのＱ
の周波数特性は、一般に、図４（ａ）に示される如く良
好であるとはいい難い。端子４の端子コア固定部４１同
志はドラムコア２の鍔部２１の表面において相互に接近
して位置決め固定されていることが、Ｑの周波数特性を
低下する原因であるものと考えられている。
【０００８】ここで、表面実装チョークコイルの良好
度：Ｑ＝ωＬ／Ｒ
但し、Ｒ：コアの損失（鉄損）＋端子を含む巻線全体の
損失（銅損）
ω：周波数
Ｌ：コイルのインダクタンス
この発明は、端子４の内の端子固定部４７とドラムコア
２の鍔部２１との間の接合部の接合面積を小さく設計し
て上述の問題を解消した表面実装チョークコイルを提供
するものである。
【０００９】
【課題を解決するための手段】リングコア、一対の鍔部
および両鍔部を連結する捲芯部より成るドラムコア、捲
芯部に捲回される巻線、および巻線の端末を接続する端
子を有し、ドラムコアおよび巻線側をリングコアに圧入
嵌合し、端子は幅をリングコアの厚みにほぼ等しい金属
板金細長片より成る端子本体部を有し、この端子本体部
の一方の側辺には端子本体部の延伸方向と交差する方向
に端子固定部４７が突出形成され、鍔部の下面と端子固
定部４７と熱硬化性合成樹脂接着剤より成る接合部をド
ラムコアの鍔部の下面に形成した表面実装チョークコイ
ルにおいて、端子固定部４７は、板面から上向きに屈曲
浮上せしめられた浮上部４７１と浮上部から端子本体部
とは逆の方向に板面に平行に屈曲せしめられた小面積の
接合片４７２より成り、リングコアの高さはドラムコア
の高さより僅かに高く構成し、接合片４７２は熱硬化性
合成樹脂接着剤６１に埋設された状態に接合固定した表
面実装チョークコイルを構成した。
【００１０】
【発明の実施の形態】この発明の実施の形態を図１を参
照して説明する。図１（ａ）は表面実装チョークコイル
の実施例の下面を示す図、図１（ｂ）は図１（ａ）の線
ｂ−ｂに沿った縦方向断面を示す図、図１（ｃ）は端子
の斜視図である。実施例において、従来例と共通する部
材には共通する参照符号を付与している。図１におい
て、リングコア１の高さはドラムコア２の高さと比較し
て僅かに高く構成されている。端子４は幅をリングコア
１の厚みにほぼ等しい金属板金細長片より成る端子本体
部４０を有している。この端子本体部４０の延伸方向の
一方の端部には先端部を板面と同一面内において少し屈
曲せしめたカラゲ半田部４２が形成されると共に、この
端子本体部４０の一方の側辺には、その中央部から端子
本体部４０の延伸方向と交差する方向に突出して小面積
の端子固定部４７が形成されている。この端子本体部４
０の他方の側辺には板面から直立する立ち上がり部４３
が形成されている。この端子固定部４７は、板面から上
向きに屈曲浮上せしめられた浮上部４７１と、この浮上
部４７１から端子本体部とは逆の方向に板面に平行に屈
曲せしめられた接合片４７２より成る。
【００１１】接合部６はドラムコア２の鍔部２１の下面
に形成され、鍔部２１の下面と、端子本体部４０の接合
片４７２と、熱硬化性合成樹脂接着剤６１とにより構成
されている。以上のリングコア１、ドラムコア２、巻線
３、および端子４を製造して準備する。端子４は、接合
部６において熱硬化性合成樹脂接着剤６１を適用して端
子本体部４０の接合片４７２を鍔部２１の下面に接合固
定することにより、ドラムコア２と一体にしておく。こ
の場合、接合片４７２は熱硬化性合成樹脂接着剤６１に
埋設された状態に接合固定する。次いで、ドラムコア２
の捲芯部２２に銅線を捲回して巻線３を形成する。巻線
３の両巻線端部を端子４のカラゲ半田部４２にカラゲ付
ける。端子４のカラゲ半田部４２に巻線３の巻線端部を
カラゲ付けた状態において、カラゲ半田部４２にリフロ
ー半田付けを施して端子４と巻線３とを電気機械的に完
全に接続する。
【００１２】以上の通りに組み立てられたドラムコア
２、巻線３、端子４に対してリングコア１を嵌合する。
リングコア１を嵌合するに際して、リングコア１の平面
部１２を端子本体部４０の立ち上がり部４３に対応させ
て嵌合する。巻線３を含むドラムコア２は熱収縮性チュ
ーブにより予め被覆されている。この被覆の厚さはリン
グコア１との間の間隙５と同等に構成されており、ドラ
ムコア２および巻線３側はリングコア１に圧入嵌合され
た状態になる。リングコア１の高さはドラムコア２の高
さと比較して僅かに高く構成されており、ドラムコア２
の鍔部２１の下面をリングコア１の下端面から僅かに浮
かせて嵌合している。
【００１３】表面実装チョークコイルは、組み立てられ
た状態において、端子４の端子本体部４０の上面にリン
グコア１の下端面が係合しており、端子４の接合片４７
２はリングコア１の下端面から僅かに浮上したドラムコ
ア２の鍔部２１の下面に熱硬化性合成樹脂接着剤に埋設
状態で接合固定している。端子本体部４０は幅をリング
コア１の厚みにほぼ等しく形成され、端子本体部４０の
一方の側辺には立ち上がり部４３が板面から直立形成さ
れると共に端子本体部４０の他方の側辺には端子本体部
４０の延伸方向と交差する方向に端子固定部４７が突出
形成されているので、端子本体部４０はドラムコア２の
鍔部２１の下面に重なることはなく、端子固定部４７の
みが鍔部２１の下面に重って、ここに鍔部２１の下面
と、端子本体部４０の接合片４７２と、熱硬化性合成樹
脂接着剤６１より成る接合部６が構成される。ここで、
チョークコイルは、表面実装に際して、リングコア１の
下端面に係合する端子本体部４０の下面がリフロー半田
付けされる領域とされる。
【００１４】図４（ｂ）は実施例のＱの周波数特性を示
す図である。実施例のＱの周波数特性は、図４（ａ）に
示される周波数特性と比較して、低周波数領域において
も良好であるあ、特に、数メガヘルツの高周波数領域に
おいて改善が認められる。
【００１５】
【発明の効果】以上の通りであって、この発明によれ
ば、表面実装チョークコイルにおいて、「端子固定部４
７は、板面から上向きに屈曲浮上せしめられた浮上部４
７１と浮上部から端子本体部とは逆の方向に板面に平行
に屈曲せしめられた小面積の接合片４７２より成り、」
なる構成を具備することにより、端子４の内の端子固定
部４７の小面積の接合片４７２部分のみがドラムコア２
の鍔部２１との間に小面積の接合部を形成する。従っ
て、端子固定部４７相互間は接合片４７２を小面積とし
た分だけ離隔は拡大して位置決め固定され、これは表面
実装チョークコイルのＱの周波数特性の改善に貢献す
る。
【００１６】そして、端子固定部４７が「板面から上向
きに屈曲浮上せしめられた浮上部４７１」を有すること
と「リングコアの高さはドラムコアの高さより僅かに高
く構成し」たことにより、接合片４７２を熱硬化性合成
樹脂接着剤６１に埋設した状態に接合固定するに際して
接合部６を端子本体部４０の下面レベルより浮上するこ
とができ、端子本体部４０の半田付け実装に支障を来す
恐れを少なくする。また、接合片４７２を熱硬化性合成
樹脂接着剤６１に埋設された状態に接合固定することに
より、接合片４７２自体がその上面と鍔部２１下面と接
合固定すると共に、接合片４７２下面から鍔部２１下面
に亘って連続して適用される熱硬化性合成樹脂接着剤６
１が硬化した暁において下面もこの硬化した合成樹脂を
介して鍔部２１下面に固定されることになり、表裏両面
からドラムコア２の鍔部２１に対して接合することとな
り、接合片４７２を小面積に設計しても接合片４７２は
鍔部２１に対する接合強度を充分に確保することができ
る。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface mount choke coil, and more particularly, to a surface mount choke coil having a drum core and a ring core as magnetic paths and having a terminal piece for improving Q of the surface mount coil. The present invention relates to a surface mount choke coil. 2. Description of the Related Art FIG. 2 shows a conventional example of a surface mount choke coil.
This will be described with reference to FIG. FIG. 2A is a perspective view of a surface mount choke coil, and FIG.
It is a figure which shows the height direction cross section along line bb 'in (a). FIG. 3 is an exploded perspective view of the surface mount choke coil of FIG. 2 and 3, reference numeral 1 denotes a ring core, 2 denotes a drum core, 3 denotes a winding, and 4 denotes a terminal. The ring core 1 and the drum core 2 are made of ferrite which is a material having high electric resistance. The side surface of the ring core 1 has a pair of flat portions 12 facing each other.
Are formed. A notch 11 is formed at the lower end of the arcuate surface portion 13 which is opposed to the pair of flat surface portions 12 and is adjacent to the pair of flat surface portions 12. The drum core 2 includes a pair of flanges 21 and a winding core 22 which is integrally connected to the two flanges 21 to connect the two. A pair of flat portions 211 facing each other is formed in a part of the both flange portions 21. A copper wire is wound around the core portion 22 of the drum core 2 to form the winding 3. The terminal 4 has a terminal core fixing portion 41 formed at the center thereof. One end of the terminal 4 is slightly bent from the terminal core fixing portion 41 to form a caraque solder portion 42, and the other end is bent at a right angle to form a rising portion 43.
It has been. The above-described ring core 1, drum core 2, winding 3, and terminal 4 are manufactured and prepared. Here, FIG.
Referring to (b), the terminal 4 is formed by applying a thermosetting synthetic resin adhesive such as epoxy resin between the upper surface of the terminal core fixing portion 41 and the lower surface of one flange 21 of the drum core 2. It is joined and fixed to the lower surface of the part 21. In this case, the rising portions 43 of the terminals 4 are opposed to the flat portions 211 of both the flange portions 21 of the drum core 2 and are jointed and fixed in parallel with each other. Next, referring to FIG. 3C, a copper wire is wound around the core portion 22 of the drum core 2 configured as shown in FIG.
To form The ends of both windings of the winding 3 are lugged to the lump solder portion 42 of the terminal 4. In a state in which the winding end of the winding 3 is luggaged to the lump solder portion 42 of the terminal 4, reflow soldering is performed on the lump solder portion 42 to completely electromechanically connect the terminal 4 and the winding 3. . [0005] The ring core 1 is fitted to the drum core 2, the windings 3, and the terminals 4 assembled as described above.
When fitting the ring core 1, the notch 11 at the lower end of the arcuate surface portion 13 of the ring core 1 is opposed to the carrage solder portion 42, and the lower end of the flat portion 12 is parallel to each other so as to correspond to the rising portion 43 of the terminal 4. I do. The soldering portion 42 of the terminal 4 is bent after soldering,
The notch 11 is formed by the bent carrage solder portion 42.
Constitute an accommodation area. Since the drum core 2 including the winding 3 is covered with the heat-shrinkable tube and accommodated in the ring core 1, the gap 5 is substantially filled with the heat-shrinkable tube. In the conventional example described above, the terminal 4 is designed so that the area of the terminal core fixing portion 41 is designed to be large, and the bonding area of the drum core 2 to the lower surface of the flange 21 is increased. It is intended to ensure a large bonding strength to the second flange 21. That is, the terminal 4 has a large-area terminal core fixing portion 41 entirely engaged with the lower surface of the flange portion 21 of the drum core 2, and a thermosetting synthetic resin adhesive is applied to this interengaging surface to join the two. Unit. And
When the choke coil is surface-mounted, the lower surface of the terminal core fixing portion 41 is in direct contact with the high-temperature molten solder and is exposed to a high temperature, and the upper surface of the terminal core fixing portion 41 and the flange 21 of the drum core 2 are joined. A large thermal stress is applied to the thermosetting synthetic resin adhesive existing between the lower surfaces. Thermosetting synthetic resin adhesives may be present due to this high thermal stress. When the terminal core fixing portion 41 and the flange portion 21 of the drum core 2 are joined, the amount of the thermosetting synthetic resin adhesive applied to the joining portion must be controlled because the joining portion has a large area. The terminal core fixing part 41 is not made uniform.
It is difficult to make the distribution of the adhesive between the flange and the flange 21 of the drum core 2 the same for each product, so that the bonding strength varies for each product. In addition, the Q of the surface mount choke coil in which the terminal core fixing portion 41 of the terminal 4 has a larger joint area with the flange portion 21 of the drum core 2 to form a joint portion.
Is generally not good as shown in FIG. 4 (a). It is considered that the fact that the terminal core fixing portions 41 of the terminals 4 are positioned and fixed close to each other on the surface of the flange portion 21 of the drum core 2 is a cause of lowering the frequency characteristics of Q. Here, the degree of goodness of the surface mount choke coil: Q = ωL / R, where R: loss of the core (iron loss) + loss of the entire winding including the terminal (copper loss) ω: frequency L: Inductance The present invention relates to the terminal fixing portion 47 of the terminal 4 and the drum core.
The present invention is to provide a surface-mounted choke coil in which the above-mentioned problem is solved by designing a bonding area of a bonding portion between the second flange portion 21 and the second flange portion 21 small . Means for Solving the Problems A ring core, a drum core comprising a pair of flanges and a core connecting the two flanges, a winding wound on the core, and a terminal of the winding are connected. have a terminal for, to press fit the drum core and the winding side ring core, the terminal has a terminal body portion made of approximately equal sheet metal strip width to the thickness of the ring core, one side of the terminal body portion On the side, a terminal fixing portion 47 is formed so as to protrude in a direction intersecting with the extending direction of the terminal main body portion. Surface mount choke coil formed on the lower surface
The terminal fixing portion 47 is bent upward from the plate surface.
The terminal body portion from the raised floating portion 471 and the floating portion
Small area bent in the opposite direction parallel to the plate surface
It consists of the joint piece 472, and the height of the ring core is the drum core.
Is slightly higher than the height of the
A surface-mounted choke coil joined and fixed in a state of being embedded in the synthetic resin adhesive 61 was formed. An embodiment of the present invention will be described with reference to FIG. FIG. 1A is a diagram showing the lower surface of the embodiment of the surface mount choke coil, FIG. 1B is a diagram showing a vertical cross section along line bb in FIG. 1A, and FIG. Is a perspective view of a terminal. In the embodiments, members common to the conventional example are assigned the same reference numerals. In FIG. 1, the height of the ring core 1 is configured to be slightly higher than the height of the drum core 2. The terminal 4 has a terminal main body 40 made of a strip of metal sheet having a width substantially equal to the thickness of the ring core 1. At one end of the terminal body 40 in the extending direction, a carrage solder portion 42 having a tip portion slightly bent in the same plane as the plate surface is formed, and on one side of the terminal body 40. Is formed with a small-area terminal fixing portion 47 protruding from a central portion thereof in a direction intersecting the direction in which the terminal body portion 40 extends. This terminal body 4
On the other side of 0, a rising portion 43 standing upright from the plate surface
Are formed. The terminal fixing portion 47 includes a floating portion 471 that is bent upward from the plate surface and a joining piece 472 that is bent from the floating portion 471 in a direction opposite to the terminal body portion and parallel to the plate surface. . The joint 6 is formed on the lower surface of the flange 21 of the drum core 2 and includes the lower surface of the flange 21, the joint piece 472 of the terminal body 40, and the thermosetting synthetic resin adhesive 61. . The above-described ring core 1, drum core 2, winding 3, and terminal 4 are manufactured and prepared. The terminal 4 is integrated with the drum core 2 by applying a thermosetting synthetic resin adhesive 61 at the joint 6 and joining and fixing the joint piece 472 of the terminal body 40 to the lower surface of the flange 21. In this case, the joining piece 472 is joined and fixed while being embedded in the thermosetting synthetic resin adhesive 61. Next, drum core 2
The winding 3 is formed by winding a copper wire around the winding core portion 22 of FIG. The ends of both windings of the winding 3 are lugged to the lump solder portion 42 of the terminal 4. In a state in which the winding end of the winding 3 is luggaged to the luggage solder portion 42 of the terminal 4, reflow soldering is performed on the luggage soldering portion 42 to completely electrically and mechanically connect the terminal 4 and the winding 3. . The ring core 1 is fitted to the drum core 2, the windings 3, and the terminals 4 assembled as described above.
When fitting the ring core 1, the flat portion 12 of the ring core 1 is fitted so as to correspond to the rising portion 43 of the terminal body 40. The drum core 2 including the windings 3 is pre-coated with a heat-shrinkable tube. The thickness of this coating is configured to be equal to the gap 5 between the ring core 1 and the drum core 2 and the winding 3 are pressed into the ring core 1. The height of the ring core 1 is configured to be slightly higher than the height of the drum core 2.
The lower surface of the flange 21 is slightly lifted from the lower end surface of the ring core 1 for fitting. In the surface mounted choke coil, the lower end surface of the ring core 1 is engaged with the upper surface of the terminal body 40 of the terminal 4 in the assembled state, and the joining piece 47 of the terminal 4 is connected.
Numeral 2 is fixed to the lower surface of the flange portion 21 of the drum core 2 slightly rising from the lower end surface of the ring core 1 by being embedded in a thermosetting synthetic resin adhesive. The terminal body 40 has a width substantially equal to the thickness of the ring core 1, and a rising portion 43 is formed upright on one side of the terminal body 40 from the plate surface, and is formed on the other side of the terminal body 40. Since the terminal fixing portion 47 is formed so as to protrude in a direction intersecting with the extending direction of the terminal main portion 40, the terminal main portion 40 does not overlap the lower surface of the flange portion 21 of the drum core 2, and only the terminal fixing portion 47 is provided. Overlying the lower surface of the flange portion 21, the lower surface of the flange portion 21, the joining piece 472 of the terminal main body 40, and the joining portion 6 made of the thermosetting synthetic resin adhesive 61 are formed. here,
The surface of the choke coil is a region where the lower surface of the terminal main body 40 that engages with the lower end surface of the ring core 1 is reflow-soldered during surface mounting. FIG. 4B is a diagram showing the frequency characteristic of Q in the embodiment. The frequency characteristics of Q of the embodiment are better in the low frequency region than in the frequency characteristics shown in FIG. 4A, and particularly, improvement is observed in the high frequency region of several megahertz. As described above, according to the present invention, in the surface mount choke coil, the "terminal fixing portion 4
Reference numeral 7 denotes a floating part 4 which is bent upward from the plate surface.
Parallel to the plate surface in the direction opposite to the terminal body from the floating part 71
A small-area joining piece 472 bent into
With this configuration, only the small-area joining piece 472 of the terminal fixing portion 47 of the terminal 4 is
A small-area joint is formed between the flange 21 and the flange 21. Therefore, the joint piece 472 has a small area between the terminal fixing portions 47.
The distance is increased and the positioning is fixed, which contributes to the improvement of the frequency characteristic of Q of the surface mount choke coil. The terminal fixing portion 47 has a "floating portion 471 bent upward from the plate surface" and " the height of the ring core is slightly higher than the height of the drum core. "
When the bonding piece 472 is bonded and fixed in a state of being embedded in the thermosetting synthetic resin adhesive 61, the bonding portion 6 can be lifted from the lower surface level of the terminal body portion 40, and the terminal body portion The risk of hindering the solder mounting of the forty is reduced. Also, by joining and fixing the joining piece 472 in a state of being embedded in the thermosetting synthetic resin adhesive 61, the joining piece 472 itself contacts the upper surface thereof and the lower surface of the flange portion 21.
At the same time, the lower surface of the joining piece 472 is fixed to the lower surface of the flange 21.
Thermosetting synthetic resin adhesive 6 applied continuously over
When 1 is hardened, the lower surface also uses this hardened synthetic resin.
It is fixed to the lower surface of the flange portion 21 through the intermediary, and is joined to the flange portion 21 of the drum core 2 from both front and back surfaces.
Sufficient bonding strength to the flange 21 can be ensured.
【図面の簡単な説明】 【図１】実施例を説明する図。 【図２】従来例を説明する図。 【図３】従来例の分解斜視図。 【図４】Ｑの周波数特性を示す図。 【符号の説明】 １ リングコア ２１ 鍔部 ２２ 捲芯部 ２ ドラムコア ３ 巻線 ４ 端子 ４０ 端子本体部 ４７ 端子固定部 ６１ 熱硬化性合成樹脂接着剤 ６ 接合部[Brief description of the drawings] FIG. 1 illustrates an embodiment. FIG. 2 illustrates a conventional example. FIG. 3 is an exploded perspective view of a conventional example. FIG. 4 is a diagram showing frequency characteristics of Q. [Explanation of symbols] 1 ring core 21 Tsubabe 22 Core 2 Drum core 3 winding 4 terminals 40 terminal body 47 Terminal fixing part 61 Thermosetting synthetic resin adhesive 6 Joint
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｈ０１Ｆ 27/29 Ｈ０１Ｆ 15/10 Ｄ Ｆ (58)調査した分野(Int.Cl.7，ＤＢ名) H01F 37/00 H01F 17/04 H01F 27/29 ──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. 7 identification symbol FI H01F 27/29 H01F 15/10 DF (58) Investigated field (Int.Cl. 7 , DB name) H01F 37/00 H01F 17 / 04 H01F 27/29
Claims (1)
連結する捲芯部より成るドラムコア、捲芯部に捲回され
る巻線、および巻線の端末を接続する端子を有し、ドラ
ムコアおよび巻線側をリングコアに圧入嵌合し、 端子は幅をリングコアの厚みにほぼ等しい金属板金細長
片より成る端子本体部を有し、この端子本体部の一方の
側辺には端子本体部の延伸方向と交差する方向に端子固
定部４７が突出形成され、 鍔部の下面と端子固定部４７と熱硬化性合成樹脂接着剤
より成る接合部をドラムコアの鍔部の下面に形成した表
面実装チョークコイルにおいて、 端子固定部４７は、板面から上向きに屈曲浮上せしめら
れた浮上部４７１と浮上部から端子本体部とは逆の方向
に板面に平行に屈曲せしめられた小面積の接合片４７２
より成り、 リングコアの高さはドラムコアの高さより僅かに高く構
成し、 接合片４７２は熱硬化性合成樹脂接着剤６１に埋設され
た状態に接合固定した ことを特徴とする表面実装チョー
クコイル。(57) [Claim 1] A drum core comprising a ring core, a pair of flanges and a core connecting the two flanges, a winding wound around the core, and a terminal of the winding. have a terminal for connecting to press fit the drum core and the winding side ring core, the terminal has a terminal body portion made of approximately equal sheet metal strip width to the thickness of the ring core, one of the terminal body portion A terminal fixing portion 47 protrudes in a direction intersecting the extending direction of the terminal main body portion on a side of the drum core, and a lower surface of the flange portion, a joint portion made of the terminal fixing portion 47 and a thermosetting synthetic resin adhesive, Table formed on the lower surface of the part
In the surface mount choke coil, the terminal fixing portion 47 is bent upward from the plate surface to be floated.
From the floating part 471 and the terminal body part from the floating part
Small-sized joint piece 472 bent in parallel to the plate surface
The height of the ring core is slightly higher than the height of the drum core.
The bonding piece 472 is embedded in the thermosetting synthetic resin adhesive 61.
A surface-mounted choke coil that is joined and fixed in an inclined state .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000150096A JP3426564B2 (en) | 2000-05-22 | 2000-05-22 | Surface mount choke coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000150096A JP3426564B2 (en) | 2000-05-22 | 2000-05-22 | Surface mount choke coil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001332431A JP2001332431A (en) | 2001-11-30 |
| JP3426564B2 true JP3426564B2 (en) | 2003-07-14 |
Family
ID=18655859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000150096A Expired - Fee Related JP3426564B2 (en) | 2000-05-22 | 2000-05-22 | Surface mount choke coil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3426564B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7986208B2 (en) * | 2008-07-11 | 2011-07-26 | Cooper Technologies Company | Surface mount magnetic component assembly |
| KR101087962B1 (en) * | 2009-08-03 | 2011-12-01 | 아비코전자 주식회사 | Surface mount inductor and manufacturing method |
| JP6330330B2 (en) * | 2014-01-10 | 2018-05-30 | Tdk株式会社 | Coil device |
| JP6330332B2 (en) * | 2014-01-14 | 2018-05-30 | Tdk株式会社 | Coil device |
-
2000
- 2000-05-22 JP JP2000150096A patent/JP3426564B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001332431A (en) | 2001-11-30 |
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