JP2009158735A

JP2009158735A - Surface-mounting coil component

Info

Publication number: JP2009158735A
Application number: JP2007335548A
Authority: JP
Inventors: Satoshi Kimura; 悟士木村; Makoto Aoki; 誠青木; Jin Ogino; 仁荻野
Original assignee: Taiyo Yuden Co Ltd
Current assignee: Taiyo Yuden Co Ltd
Priority date: 2007-12-27
Filing date: 2007-12-27
Publication date: 2009-07-16

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface-mounting coil component that can suppress variation in height and can be made low. <P>SOLUTION: The surface-mounting coil component includes a drum type core comprising a core portion 11a, an upper flange portion 11b and a lower flange portion 11c, a coil conductor 12 wound around the core portion, and a magnetic-powder containing resin 18 covering the wound coil conductor, wherein the lower flange portion has a protrusion portion protruding from a projection region of the upper flange portion, the upper flange portion has, on its upper surface side, a thickness-directional step portion along an edge, and the magnetic-powder containing resin is discharged to between the upper flange portion and lower flange portion along a side surface of the upper flange portion and cured. Consequently, the magnetic-powder containing resin projecting to the upper surface side of the upper flange portion is received in a space on the step portion of the upper flange portion to suppress height variation of the surface-mounting coil component. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、携帯型電子機器や薄型の電子機器に用いられる巻線タイプの面実装コイル部品に関する。 The present invention relates to a winding type surface mount coil component used for portable electronic devices and thin electronic devices.

携帯型電話機やデジタルスチルカメラ等の携帯型の電子機器におけるＤＣ／ＤＣ電源の降昇圧コイルや各種のフラットパネルディスプレイの周辺回路のチョークコイル等として、面実装コイル部品が用いられている。特に上記用途に向けて、良好な磁気特性を確保しつつ低背な外形寸法を有するものが要請されている。面実装コイル部品は、例えば、ドラム型コアと該ドラム型コアに設けられた接続電極と前記ドラム型コアに巻回されるとともにその端部が前記接続電極に接続されたコイル導線とを有する。より具体的には、前記ドラム型コアは、巻芯部と該巻芯部の上端に設けられた上鍔部と前記巻芯部の下端に設けられた下鍔部とから成る。前記一対の接続電極は、例えば前記ドラム型コアの下鍔部の表面に形成されている。また、前記コイル導線は、前記ドラム型コアの巻芯部の周囲に巻回されるとともに一方及び他方の端部が前記接続電極にそれぞれ半田等により接続された絶縁被覆導線からなるものである。 Surface mounted coil components are used as step-up / down coils for DC / DC power supplies and choke coils for peripheral circuits of various flat panel displays in portable electronic devices such as portable telephones and digital still cameras. In particular, for the above applications, there is a demand for one having a low profile while ensuring good magnetic properties. The surface mount coil component includes, for example, a drum core, a connection electrode provided on the drum core, and a coil conductor wound around the drum core and having an end connected to the connection electrode. More specifically, the drum core includes a core part, an upper collar part provided at the upper end of the core part, and a lower collar part provided at the lower end of the core part. The pair of connection electrodes are formed, for example, on the surface of the lower collar portion of the drum core. The coil conductor is formed of an insulation-coated conductor that is wound around the core of the drum core and has one and other ends connected to the connection electrode by solder or the like.

上述した面実装コイル部品の一例が特許文献１に記載されている。具体的には、図９（Ａ）及び図９（Ｂ）に示すように、コア１１１の図示省略した巻芯部に図示省略したコイル導線を巻回した巻線型コイル部品１１０である。そして、前記コア１１１は、前記巻芯部と、該巻芯部の上端に設けられた上鍔部１１１ｂと、前記巻芯部の下端に設けられた下鍔部１１１ｃとからなる。そして、前記下鍔部１１１ｃの底面１１１Ｂに一対の接続電極１１６ａ，１１６ｂが設けられている。そして、前記コイル導線の端部１１２ａ，１１２ｂのそれぞれ先端の絶縁被覆が剥離されて内部の金属線の端部１１３ａ，１１３ｂが露出され、前記接続電極１１６ａ，１１６ｂにそれぞれ半田等の導電性接合材１１７により導電接続されている。これにより、実装面積を小さくすることが提案されている。
特開２００７−２１４５２１号公報 An example of the surface mount coil component described above is described in Patent Document 1. Specifically, as shown in FIGS. 9A and 9B, a coiled coil component 110 in which a coil lead wire (not shown) is wound around a core portion (not shown) of the core 111 is shown. And the said core 111 consists of the said core part, the upper collar part 111b provided in the upper end of this core part, and the lower collar part 111c provided in the lower end of the said core part. A pair of connection electrodes 116a and 116b are provided on the bottom surface 111B of the lower collar portion 111c. Then, the insulating coatings at the tips of the coil conductor end portions 112a and 112b are peeled off to expose the end portions 113a and 113b of the internal metal wires, and a conductive bonding material such as solder is connected to the connection electrodes 116a and 116b, respectively. The conductive connection is made by 117. Accordingly, it has been proposed to reduce the mounting area.
JP 2007-214521 A

上記背景技術に記載の面実装コイル部品１１０においては、低背化のために上鍔部１１１ｂの厚さを薄くすると、前記巻芯部に巻回されたコイル導線を被覆するために、例えばディスペンサーのノズルを介して前記上鍔部１１１ｂと下鍔部１１１ｃの間に前記磁性粉含有樹脂１１８のペーストを吐出する際に、前記上鍔部１１１ｂの上面１１１Ｔ側の縁部近傍に磁性粉含有樹脂１１８がはみ出し、前記面実装コイル部品１１０の高さ寸法バラツキを生じやすいという課題があった。また、上記のように上鍔部１１１ｂの上面１１１Ｔ側に磁性粉含有樹脂１１８のはみ出しを生じると、例えば回路配線基板上への実装時等において前記コイル部品の上方から外部応力が付加された際に、前記上鍔部１１１ｂの縁部近傍に前記外部応力が集中し、該上鍔部１１１ｂを破損する虞があった。 In the surface mount coil component 110 described in the above background art, when the thickness of the upper collar portion 111b is reduced in order to reduce the height, for example, a dispenser is used to cover the coil conductor wound around the winding core portion. When the paste of the magnetic powder-containing resin 118 is discharged between the upper flange portion 111b and the lower flange portion 111c through the nozzle, the magnetic powder-containing resin is near the edge on the upper surface 111T side of the upper flange portion 111b. There is a problem that 118 protrudes and the surface mounting coil component 110 is likely to have a height variation. In addition, when the magnetic powder-containing resin 118 protrudes on the upper surface 111T side of the upper collar portion 111b as described above, for example, when external stress is applied from above the coil component during mounting on the circuit wiring board, for example. In addition, the external stress concentrates in the vicinity of the edge of the upper collar portion 111b, which may damage the upper collar portion 111b.

本発明は、高さ寸法バラツキの発生を抑制して低背化が可能な面実装コイル部品を提供することを目的とする。 An object of the present invention is to provide a surface mount coil component that can be reduced in height by suppressing the occurrence of height dimension variations.

上記目的を達成するため、本発明者らが鋭意検討した結果、ドラム型コアの形状及び磁性粉含有樹脂外装樹脂の塗布方法を工夫することにより、高さ寸法ばらつきの発生を抑制可能であることを見出し、本発明に至った。本発明の面実装コイル部品は、（１）巻芯部と該巻芯部の上端に設けられた上鍔部と前記巻芯部の下端に設けられた下鍔部とから成るドラム型コアと、前記巻芯部の周囲に巻回されたコイル導線と、前記巻回されたコイル導線を被覆する磁性粉含有樹脂と、を有する面実装コイル部品において、前記下鍔部は前記上鍔部の投影領域よりも外側に突出する張り出し部を備え、前記上鍔部は上面側に該上鍔部の縁に沿って厚さ方向の段部が形成されており、前記磁性粉含有樹脂は前記上鍔部と前記下鍔部との間に前記上鍔部の側面から前記下鍔部の対向する縁に亘って形成されたものである。（・・・以下第１の課題解決手段と称する。） As a result of intensive studies by the present inventors to achieve the above object, it is possible to suppress the occurrence of height dimension variations by devising the shape of the drum core and the coating method of the magnetic powder-containing resin sheathing resin. And found the present invention. The surface mount coil component according to the present invention includes: (1) a drum-type core including a core portion, an upper collar portion provided at the upper end of the core portion, and a lower collar portion provided at the lower end of the core portion; In the surface mount coil component having a coil conductor wound around the winding core part and a magnetic powder-containing resin covering the wound coil conductor, the lower collar part is a part of the upper collar part. A projecting portion projecting outward from the projection region, the upper collar portion has a step in the thickness direction formed along the edge of the upper collar portion on the upper surface side, and the magnetic powder-containing resin is Between the collar part and the lower collar part, it is formed from the side surface of the upper collar part to the opposite edge of the lower collar part. (... hereinafter referred to as first problem solving means)

上記第１の課題解決手段による作用は次の通りである。すなわち、前記下鍔部は前記上鍔部の投影領域よりも外側に突出する張り出し部を備え、前記上鍔部は上面側に該上鍔部の縁に沿って厚さ方向の段部が形成されており、前記磁性粉含有樹脂は前記上鍔部と前記下鍔部との間に前記上鍔部の側面から前記下鍔部の対向する縁に亘って形成されている。これによれば、前記上鍔部と下鍔部との間に前記上鍔部の側面に沿って吐出された磁性粉含有樹脂が前記上鍔部の上面側にはみ出した際に、前記上鍔部の厚さ方向の段部と前記上鍔部の上面とで規制される前記段部上の空間に受容される。 The operation of the first problem solving means is as follows. That is, the lower collar portion includes an overhanging portion that projects outward from the projection region of the upper collar portion, and the upper collar portion is formed with a step in the thickness direction along the edge of the upper collar portion on the upper surface side. The magnetic powder-containing resin is formed between the upper collar part and the lower collar part from the side surface of the upper collar part to the opposite edge of the lower collar part. According to this, when the magnetic powder-containing resin discharged along the side surface of the upper collar part between the upper collar part and the lower collar part protrudes to the upper surface side of the upper collar part, the upper collar It is received in the space on the step part which is regulated by the step part in the thickness direction of the part and the upper surface of the upper collar part.

本発明の面実装コイル部品によれば、上鍔部の上面側にはみ出した磁性粉含有樹脂が前記上鍔部の段部上の空間に受容されるので、前記面実装コイル部品の高さ寸法バラツキの発生を抑制することができる。また、上鍔部の上面側にはみ出した磁性粉含有樹脂が前記上鍔部の段部上の空間に受容されるので、例えば回路配線基板上への実装時等において前記巻線型コイル部品の上方から外部応力Ｆが付加された際に、前記上鍔部の上面全体に分散される。このため、前記上鍔部の縁部近傍に外部応力が集中するのを回避することができる。本発明の上記目的とそれ以外の目的、構成特徴、作用効果は、以下の説明と添付図面によって明らかとなろう。 According to the surface mount coil component of the present invention, the magnetic powder-containing resin that protrudes to the upper surface side of the upper flange portion is received in the space on the step portion of the upper flange portion. The occurrence of variation can be suppressed. Further, since the magnetic powder-containing resin that protrudes from the upper surface of the upper collar is received in the space above the step of the upper collar, for example, when mounted on the circuit wiring board, When the external stress F is applied from above, the entire upper surface of the upper collar is dispersed. For this reason, it can avoid that external stress concentrates on the edge part vicinity of the said upper collar part. The above object and other objects, structural features, and operational effects of the present invention will become apparent from the following description and the accompanying drawings.

以下、本発明の面実装コイル部品の第１の実施形態について、図１〜図６を参照して説明する。図１は第１の実施形態の面実装コイル部品１０の全体構造を示す外観斜視図である。図２は、上記実施形態の面実装コイル部品１０の内部構造を示す上記図１のＡ−Ａ線における縦断面図である。図３は上記実施形態の面実装コイル部品１０の要部を示す上記図２の破線Ｂで囲まれる領域の要部拡大断面図である。図４は上記実施形態の面実装コイル部品１０に用いるドラム型コア１１の一例を示す外観斜視図である。図５は、上記実施形態の面実装コイル部品１０の磁性粉含有樹脂１８の塗布方法を示す縦断面図である。図６は、上記実施形態の面実装コイル部品１０に外部応力Ｆが付加される様子を示す縦断面図である。 Hereinafter, a first embodiment of a surface mount coil component of the present invention will be described with reference to FIGS. FIG. 1 is an external perspective view showing the overall structure of the surface mount coil component 10 of the first embodiment. FIG. 2 is a longitudinal sectional view taken along line AA of FIG. 1 showing the internal structure of the surface mount coil component 10 of the above embodiment. FIG. 3 is an enlarged cross-sectional view of a main part of a region surrounded by a broken line B in FIG. 2 showing a main part of the surface mount coil component 10 of the above embodiment. FIG. 4 is an external perspective view showing an example of the drum core 11 used in the surface mount coil component 10 of the above embodiment. FIG. 5 is a longitudinal sectional view showing a method for applying the magnetic powder-containing resin 18 of the surface mount coil component 10 of the above embodiment. FIG. 6 is a longitudinal sectional view showing a state in which an external stress F is applied to the surface mount coil component 10 of the above embodiment.

図１〜図４に示すように、本実施形態の面実装コイル部品１０は、軟磁性材料からなるドラム型コア１１と、該ドラム型コア１１に巻回されたコイル導線１２と、を有するものである。さらに、上記コイル導線１２の端部１３ａ，１３ｂはそれぞれ該ドラム型コア１１の下鍔部１１ｃの表面に形成された一対の接続電極１６ａ，１６ｂに半田等の導電性接合材１７により導電接続されている。そして、前記巻回されたコイル導線１２を被覆する磁性粉含有樹脂１８を有する。 As shown in FIGS. 1 to 4, the surface mount coil component 10 of the present embodiment includes a drum core 11 made of a soft magnetic material, and a coil conductor 12 wound around the drum core 11. It is. Further, the end portions 13a and 13b of the coil conductor 12 are conductively connected to a pair of connection electrodes 16a and 16b formed on the surface of the lower collar portion 11c of the drum core 11 by a conductive bonding material 17 such as solder. ing. And it has the magnetic powder containing resin 18 which coat | covers the said wound coil conducting wire 12. FIG.

より具体的には、前記ドラム型コア１１は、図４に示すように、巻芯部１１ａと該巻芯部１１ａの上端に設けられた上鍔部１１ｂと前記巻芯部１１ａの下端に設けられた下鍔部１１ｃとから成る。前記上鍔部１１ｂは、平面視形状が多角形（例えば８角形）に形成されている。そして、該上鍔部１１ｂは上面１１Ｔ側に該上鍔部１１ｂの縁１１ｅに沿って厚さ方向の段部１５が形成されている。本実施形態の面実装コイル部品１０において、前記厚さ方向の段部１５は、図３に示すように、前記上鍔部１１ｂの上面１１Ｔと並行な段差１５ａと、該段差１５ａと前記上面１１Ｔとをつなぐ斜面１５ｂとからなり、該厚さ方向の段部１５と前記上鍔部１１ｂの上面１１Ｔとで規制される前記段部１５上の空間１５Ｓを有する。前記下鍔部１１ｃは略矩形状に形成されている。そして図４に示すように、前記下鍔部１１ｃは一点鎖線Ｃで囲まれる前記上鍔部１１ｂの投影領域よりも外側に突出するハッチングで示された張り出し部１１ＯＨを有する。また、前記下鍔部１１ｃは、図２に示すように前記巻芯部１１ａの延長上を挟むように底面１１Ｂに一対の平行な溝１１Ｅを備える。前記接続電極１６ａ，１６ｂは、例えば前記下鍔部１１ｃの底面１１Ｂに形成された溝１１Ｅの内面に沿って、それぞれ短冊状に形成されている。そして、ドラム型コア１１の巻芯部１１ａの周囲に巻回された前記コイル導線１２の端部１２ａ，１２ｂは、前記下鍔部１１ｃの底面１１Ｂの前記溝１１Ｅに沿って折り返されている。そして、その先端側の絶縁被覆が剥離され、露出された金属線の端部１３ａ，１３ｂが前記接続電極１６ａ、１６ｂに半田等の導電性接合材１７により導電接続されている。 More specifically, as shown in FIG. 4, the drum core 11 is provided at the winding core portion 11a, the upper collar portion 11b provided at the upper end of the winding core portion 11a, and the lower end of the winding core portion 11a. And the lower collar portion 11c. The upper collar portion 11b is formed in a polygonal shape (for example, an octagon) in plan view. The upper flange portion 11b is formed with a step 15 in the thickness direction along the edge 11e of the upper flange portion 11b on the upper surface 11T side. In the surface mount coil component 10 of the present embodiment, as shown in FIG. 3, the step portion 15 in the thickness direction includes a step 15a parallel to the upper surface 11T of the upper collar portion 11b, and the step 15a and the upper surface 11T. And a space 15S on the step portion 15 that is regulated by the step portion 15 in the thickness direction and the upper surface 11T of the upper flange portion 11b. The lower collar portion 11c is formed in a substantially rectangular shape. And as shown in FIG. 4, the said lower collar part 11c has the overhang | projection part 11OH shown by the hatching protruded outside the projection area | region of the said upper collar part 11b enclosed with the dashed-dotted line C. As shown in FIG. Further, as shown in FIG. 2, the lower flange portion 11c includes a pair of parallel grooves 11E on the bottom surface 11B so as to sandwich the extension of the core portion 11a. The connection electrodes 16a and 16b are each formed in a strip shape, for example, along the inner surface of the groove 11E formed in the bottom surface 11B of the lower collar portion 11c. Then, the end portions 12a and 12b of the coil conductor 12 wound around the core portion 11a of the drum core 11 are folded back along the groove 11E of the bottom surface 11B of the lower flange portion 11c. The insulating coating on the tip side is peeled off, and the exposed ends 13a and 13b of the metal wire are conductively connected to the connection electrodes 16a and 16b by a conductive bonding material 17 such as solder.

また、本実施形態の面実装コイル部品１０は、図５に示すように、前記ドラム型コア１１の巻芯部１１ａに巻回されたコイル導線１２を被覆するように、例えば図示省略したディスペンサーを用い、ノズルＮＺを介して前記上鍔部１１ｂの側面１１Ｓに沿って磁性粉含有樹脂１８が吐出され硬化されている。この結果、前記磁性粉含有樹脂１８が前記上鍔部１１ｂと前記下鍔部１１ｃとの間に前記上鍔部１１ｂの側面１１Ｓから前記下鍔部１１ｃの対向する縁に亘って、例えば裾野状に形成されている。また、前記上鍔部１１ｂの側面１１Ｓに沿って吐出された磁性粉含有樹脂１８が前記上鍔部１１ｂの上面１１Ｔ側にはみ出した際に、前記上鍔部１１ｂの厚さ方向の段部１５と前記上鍔部１１ｂの上面１１Ｔとで規制される前記段部１５上の空間１５Ｓにはみ出し部１８Ｓが受容される。また、図６に示すように、例えば図示省略した回路基板等への実装時において、前記面実装コイル部品１０の上方から外部応力Ｆが付加された際に、該外部応力Ｆが前記上鍔部１１ｂの上面１１Ｔ全体に分散され、上鍔部１１ｂの縁部近傍に外部応力が集中するのを回避することができる。 Further, as shown in FIG. 5, the surface mount coil component 10 according to the present embodiment includes, for example, a dispenser (not shown) so as to cover the coil conductor 12 wound around the core 11 a of the drum core 11. The magnetic powder-containing resin 18 is discharged and cured along the side surface 11S of the upper flange portion 11b through the nozzle NZ. As a result, the magnetic powder-containing resin 18 extends from the side surface 11S of the upper collar portion 11b to the opposite edge of the lower collar portion 11c between the upper collar portion 11b and the lower collar portion 11c. Is formed. Further, when the magnetic powder-containing resin 18 discharged along the side surface 11S of the upper collar portion 11b protrudes to the upper surface 11T side of the upper collar portion 11b, the step portion 15 in the thickness direction of the upper collar portion 11b. And the protruding portion 18S is received in the space 15S on the step portion 15 which is regulated by the upper surface 11T of the upper flange portion 11b. Further, as shown in FIG. 6, when external stress F is applied from above the surface mount coil component 10 when mounted on a circuit board (not shown), for example, the external stress F is applied to the upper collar portion. It is possible to avoid the external stress from being concentrated in the vicinity of the edge of the upper flange portion 11b by being dispersed over the entire upper surface 11T of the 11b.

上記ドラム型コア１１の好ましい実施形態は次の通りである。すなわち、上記ドラム型コア１１としては、軟磁性材料からなることが好ましく、Ｎｉ−Ｚｎ系フェライト、Ｎｉ−Ｚｎ−Ｃｕ系フェライト等を主成分とする高透磁率磁性材料がより好ましい。前記磁性材料の粉末とバインダーとを混合し、造粒した後、粉末成型プレスを用いて角柱状の成形体を形成し、研削ディスクを用いてセンターレス研摩により凹部を形成してドラム形の成形体を得る。次に、得られたドラム形の成形体を５００℃前後で脱バインダー処理した後、前記磁性材
料の焼結温度に応じて所定の温度で焼成することにドラム型コア１１が得られる。また、前記ドラム形の成形体は、前記角柱状の成形体の周側面にセンターレス研摩により凹部を形成して得る方法に限定するものではなく、例えば、前記と同様に造粒した後、粉末成型プレスを用いて乾式一体成型により得ることもできる。また、上記ドラム型コアは、予めドラム形の成形体を準備して焼成する方法に限定するものではなく、例えば、前記と同様に柱状の成形体を準備した後、前記と同様に脱バインダー処理し、所定の温度で焼成した後に、角柱状の焼結磁性体の周側面にダイヤモンドホイール等を用いて切削加工により凹部を形成してもよい。 A preferred embodiment of the drum core 11 is as follows. That is, the drum core 11 is preferably made of a soft magnetic material, and more preferably a high permeability magnetic material mainly composed of Ni—Zn ferrite, Ni—Zn—Cu ferrite and the like. After the magnetic material powder and binder are mixed and granulated, a prismatic molded body is formed using a powder molding press, and a concave portion is formed by centerless polishing using a grinding disk to form a drum shape. Get the body. Next, after the obtained drum-shaped molded body is debindered at around 500 ° C., the drum-type core 11 is obtained by firing at a predetermined temperature according to the sintering temperature of the magnetic material. Further, the drum-shaped molded body is not limited to a method obtained by forming a concave portion on the peripheral side surface of the prismatic molded body by centerless polishing. For example, after the granulation in the same manner as described above, the powder It can also be obtained by dry integral molding using a molding press. The drum-type core is not limited to a method in which a drum-shaped molded body is prepared and fired in advance. For example, after preparing a columnar molded body in the same manner as described above, the binder removal treatment is performed in the same manner as described above. Then, after firing at a predetermined temperature, a concave portion may be formed by cutting using a diamond wheel or the like on the peripheral side surface of the prismatic sintered magnetic body.

上記ドラム型コア１１の巻芯部１１ａは、所定の巻回数を得るために必要なコイル導線１２の長さをより短くできるように断面が略円形もしくは円形が好ましいが、これに限定するものではなく、特に乾式一体成型によりドラム形の成形体を得る方法で作成する場合にあっては、金型の耐久性やバリ取りの容易性などを考慮して適宜変更することができる。前記巻芯部１１ａの直径は例えば３．６ｍｍ、長さ（高さ）は例えば０．３ｍｍである。 The core part 11a of the drum core 11 preferably has a substantially circular or circular cross section so that the length of the coil conductor 12 necessary for obtaining a predetermined number of turns can be shortened. However, the present invention is not limited to this. In particular, in the case of producing by a method of obtaining a drum-shaped molded body by dry integral molding, it can be appropriately changed in consideration of the durability of the mold and the ease of deburring. The diameter of the core part 11a is, for example, 3.6 mm, and the length (height) is, for example, 0.3 mm.

上記ドラム型コア１１の上鍔部１１ｂの外形は、高密度実装に対応して小型化をはかるために、平面視形状は多角形状が好ましく前記下鍔部１１ｃに対応して類似の形状が好ましい。 The outer shape of the upper collar portion 11b of the drum core 11 is preferably a polygonal shape in plan view, and preferably has a similar shape corresponding to the lower collar portion 11c in order to reduce the size in response to high-density mounting. .

次に、上記上鍔部１１ｂの厚さ方向の段部１５の好ましい実施形態について説明する。すなわち、上記段部１５としては、前記上鍔部１１ｂの上面１１Ｔ側に該上鍔部１１ｂの縁１１ｅに沿って厚さ方向に形成されることが好ましい。前記厚さ方向の段部１５の断面形状は、例えば段差や斜面が好ましいが、これに限定するものではなく、複数の段差や複数の斜面、あるいは段差と斜面の組み合わせ等から構成することができる。また、上記ドラム型コア１１の上鍔部１１ｂへの厚さ方向の段部１５の形成は、例えば、上述と同様に粉末成型プレスを用いて、予め上面１１Ｔ側の縁１１ｅに沿って段差や斜面等からなる段部１５が形成された略角柱状の成形体を形成し、その後、前記と同様のプロセスにより作成することが好ましい。また、本発明はこれに限定するものではなく、例えば、予め前記プロセスにより形成したドラム型コア１１の上鍔部１１ｂの上面１１Ｔ側に切削加工により段差や斜面等からなる段部１５を形成してもよい。 Next, a preferred embodiment of the step portion 15 in the thickness direction of the upper collar portion 11b will be described. That is, the step portion 15 is preferably formed in the thickness direction along the edge 11e of the upper flange portion 11b on the upper surface 11T side of the upper flange portion 11b. The cross-sectional shape of the step portion 15 in the thickness direction is preferably, for example, a step or a slope, but is not limited to this, and can be composed of a plurality of steps, a plurality of slopes, or a combination of steps and slopes. . In addition, the stepped portion 15 in the thickness direction on the upper flange portion 11b of the drum-type core 11 is formed by using a powder molding press in the same manner as described above, in advance along the edge 11e on the upper surface 11T side. It is preferable to form a substantially prismatic shaped body in which the step portion 15 made of an inclined surface or the like is formed, and then create it by the same process as described above. The present invention is not limited to this. For example, a step portion 15 made of a step, a slope, or the like is formed by cutting on the upper surface 11T side of the upper flange portion 11b of the drum core 11 formed in advance by the above process. May be.

上記ドラム型コア１１の下鍔部１１ｃの外形は、高密度実装に対応して小型化をはかるために、平面視形状が略矩形状や略多角形状が好ましい。また、前記上鍔部１１ｂの投影領域よりも外側に突出する張り出し部１１ＯＨを備えることが好ましい。 The outer shape of the lower flange portion 11c of the drum core 11 is preferably a substantially rectangular shape or a substantially polygonal shape in plan view in order to reduce the size in correspondence with high-density mounting. Moreover, it is preferable to provide the overhang | projection part 11OH which protrudes outside the projection area | region of the said upper collar part 11b.

また、上記上鍔部１１ｂ及び上記下鍔部１１ｃの厚さは、低背型の面実装コイル部品１０を提供するために、それぞれ０．５ｍｍ以下が好ましい。一方、上記上鍔部１１ｂ及び上記下鍔部１１ｃの厚さの下限値は、上記ドラム型コア１１における前記巻芯部１１ａからの前記上鍔部１１ｂ及び前記下鍔部１１ｃそれぞれの張り出し寸法を考慮して所定の強度を満足するように設定することが好ましい。また、上記下鍔部１１ｃの外形は、例えば、平面視形状が長さ６．８ｍｍ、幅６．０ｍｍの略矩形状で、前記下鍔部１１ｃの厚さは例えば０．３６ｍｍである。また、前記上鍔部１１ｂの外形は、例えば、平面視形状が長さ及び幅がそれぞれ６．０ｍｍの略８角形状で、前記上鍔部１１ｂの厚さは例えば０．３６ｍｍである。また、上記上鍔部１１ｂの上面１１Ｔ側に該上鍔部１１ｂの縁１１ｅに沿って形成される厚さ方向の段部１５は、例えば、縁１１ｅと接する高さ０．０５ｍｍ、幅０．１ｍｍの段差１５ａと、該段差１５ａから前記上鍔部１１ｂの上面１１Ｔに至る幅０．１ｍｍの斜面１５ｂとを有する。また、これに限定するものではなく、例えば高さ０．０５ｍｍ、幅０．１ｍｍの段差を複数段組み合わせたものであってもよい。 Moreover, in order to provide the low profile type surface mount coil component 10, the thickness of the said upper collar part 11b and the said lower collar part 11c is respectively 0.5 mm or less. On the other hand, the lower limit value of the thickness of the upper collar part 11b and the lower collar part 11c is the extension dimension of each of the upper collar part 11b and the lower collar part 11c from the core part 11a in the drum core 11. It is preferable to set so as to satisfy a predetermined strength in consideration. The outer shape of the lower collar portion 11c is, for example, a substantially rectangular shape having a length of 6.8 mm in plan view and a width of 6.0 mm, and the thickness of the lower collar portion 11c is, for example, 0.36 mm. Further, the outer shape of the upper collar part 11b is, for example, a substantially octagonal shape having a length and a width of 6.0 mm in plan view, and the thickness of the upper collar part 11b is, for example, 0.36 mm. Further, the step 15 in the thickness direction formed on the upper surface 11T side of the upper collar portion 11b along the edge 11e of the upper collar portion 11b has, for example, a height of 0.05 mm and a width of 0. A 1 mm step 15a and a slope 15b having a width of 0.1 mm extending from the step 15a to the upper surface 11T of the upper flange portion 11b are provided. Moreover, it is not limited to this, For example, what combined several steps | paragraphs of height 0.05mm and width 0.1mm may be used.

次に、上記コイル導線１２の好ましい実施形態は次の通りである。すなわち、上記コイル導線１２としては、上記ドラム型コア１１の巻芯部１１ａの周囲に巻回されるものであって、良導電性の金属（例えば銅）線１３の外周にポリウレタン樹脂、ポリエステル樹脂等の絶縁層が被覆されている。また、上記コイル導線１２の金属線は、単線に限定するものではなく、撚り線であってもよい。また、該コイル導線１２の金属線は円形の断面形状に限定するものではなく、例えば長方形の断面形状の平角線や正方形の断面形状の四角線等を用いることもできる。 Next, a preferred embodiment of the coil conductor 12 is as follows. That is, the coil conductor 12 is wound around the core portion 11a of the drum core 11, and has a polyurethane resin or a polyester resin on the outer periphery of a highly conductive metal (for example, copper) wire 13. Etc. are covered with an insulating layer. Moreover, the metal wire of the said coil conducting wire 12 is not limited to a single wire, A twisted wire may be sufficient. Further, the metal wire of the coil conductor 12 is not limited to a circular cross-sectional shape, and for example, a rectangular wire having a rectangular cross-sectional shape, a square wire having a square cross-sectional shape, or the like may be used.

上記接続電極１６ａ，１６ｂの好ましい実施形態は次の通りである。すなわち、上記接続電極１６ａ，１６ｂとしては、例えば上記ドラム型コア１１の下鍔部１１ｃの底面１１ＢにＡｇ粉末とホウ珪酸亜鉛系のガラスフリットとを主成分とする焼付型の電極ペーストを転写法、スクリーン印刷法、インクジェット法等により塗布し、焼付処理して得られる厚膜タイプの接続電極が好ましい。また、これに限定するものではなく、銅等の良導電性の金属の箔や板を例えば打ち抜きプレス成型で所定形状に成形した金属片を前記下鍔部１１ｃの底面１１Ｂに接着剤等により固着したものであってもよい。 A preferred embodiment of the connection electrodes 16a and 16b is as follows. That is, as the connection electrodes 16a and 16b, for example, a baking type electrode paste mainly composed of Ag powder and zinc borosilicate glass frit is applied to the bottom surface 11B of the lower flange portion 11c of the drum core 11. A thick-film type connection electrode obtained by coating by a screen printing method, an ink jet method or the like and baking treatment is preferable. Further, the present invention is not limited to this, and a metal piece obtained by forming a foil or plate of a highly conductive metal such as copper into a predetermined shape by, for example, punching press molding is fixed to the bottom surface 11B of the lower collar portion 11c with an adhesive or the like. It may be what you did.

上記磁性粉含有樹脂１８の好ましい実施形態は次の通りである。すなわち、上記磁性粉含有樹脂１８は前記上鍔部１１ｂと前記下鍔部１１ｃとの間に前記上鍔部１１ｂの側面１１Ｓから前記下鍔部１１ｃの対向する縁に亘って、例えば裾野状等に形成されていることが好ましい。上記磁性粉含有樹脂１８としては、上記面実装コイル部品１０の使用温度範囲において粘弾性を有するものが好ましい。より具体的には、硬化時の物性として温度に対する剛性率の変化においてガラス状態からゴム状態に移行する過程におけるガラス転移温度が−２０℃以下の磁性粉含有樹脂が好ましく、硬化時の物性として温度に対する剛性率の変化においてガラス状態からゴム状態に移行する過程におけるガラス転移温度が−５０℃以下の磁性粉含有樹脂がより好ましい。上記磁性粉含有樹脂１８に用いる樹脂としては、シリコーン樹脂が好ましく、前記上鍔部１１ｂと下鍔部１１ｃとの間に磁性粉含有樹脂１８を吐出し、硬化する工程のリードタイムを短縮できるのでエポキシ樹脂とカルボキシル基変性プロピレングリコールとの混合樹脂がより好ましい。 A preferred embodiment of the magnetic powder-containing resin 18 is as follows. That is, the magnetic powder-containing resin 18 extends from the side surface 11S of the upper collar part 11b to the opposite edge of the lower collar part 11c between the upper collar part 11b and the lower collar part 11c. It is preferable to be formed. As said magnetic powder containing resin 18, what has viscoelasticity in the operating temperature range of the said surface mount coil component 10 is preferable. More specifically, a magnetic powder-containing resin having a glass transition temperature of −20 ° C. or lower in the process of transition from a glass state to a rubber state in a change in rigidity with respect to temperature as a physical property upon curing is preferable, and a temperature as a physical property upon curing is More preferable is a magnetic powder-containing resin having a glass transition temperature of −50 ° C. or lower in the process of transition from the glass state to the rubber state in the change in the rigidity ratio. The resin used for the magnetic powder-containing resin 18 is preferably a silicone resin, because the lead time of the step of discharging and curing the magnetic powder-containing resin 18 between the upper collar portion 11b and the lower collar portion 11c can be shortened. A mixed resin of an epoxy resin and a carboxyl group-modified propylene glycol is more preferable.

次に、上記磁性粉含有樹脂１８に用いる磁性粉としては、種々の磁性粉を用いることができる。具体的には、Ｎｉ−Ｚｎ系フェライトの粉末、Ｎｉ−Ｚｎ−Ｃｕ系フェライトの粉末、Ｍｎ−Ｚｎ系フェライトの粉末、金属磁性粉末等のうちから選択された１種、もしくは複数種を混合して用いることが好ましい。また、上記磁性粉の粒径は、５〜２０μｍが好ましい。また、上記磁性粉含有樹脂１８中の前記磁性粉の含有量は３０〜８５ｗｔ％が好ましい。 Next, various magnetic powders can be used as the magnetic powder used for the magnetic powder-containing resin 18. Specifically, one or more selected from Ni—Zn ferrite powder, Ni—Zn—Cu ferrite powder, Mn—Zn ferrite powder, metal magnetic powder, and the like are mixed. Are preferably used. The particle size of the magnetic powder is preferably 5 to 20 μm. Further, the content of the magnetic powder in the magnetic powder-containing resin 18 is preferably 30 to 85 wt%.

上記ドラム型コア１１の巻芯部１１ａの周囲に巻回されたコイル導線１２の外周上に上記磁性粉含有樹脂１８を被覆する方法としては、例えば、前記磁性粉含有樹脂１８のペーストを図示省略したディスペンサーを用いて例えばノズルＮＺを介して前記上鍔部１１ｂの側面１１Ｓに沿って前記上鍔部１１ｂと前記下鍔部１１ｃとの間の前記コイル導線１２の外周上に吐出させ、硬化させることが好ましい。 As a method of coating the magnetic powder-containing resin 18 on the outer periphery of the coil conductor 12 wound around the core portion 11a of the drum core 11, for example, the magnetic powder-containing resin 18 paste is not shown. Using the dispenser, for example, discharged onto the outer periphery of the coil conductor 12 between the upper flange portion 11b and the lower flange portion 11c along the side surface 11S of the upper flange portion 11b through the nozzle NZ and cured. It is preferable.

尚、上記磁性粉含有樹脂１８は、上記接続電極１６ａ，１６ｂと上記コイル導線１２の端部１３a、１３ｂとの導電性接合材１７による接続の後に上記巻回されたコイル導線１２の外周を被覆するように形成される場合には、該面実装コイル部品１０の接続電極１６ａ，１６ｂを該面実装コイル部品１０が実装される回路配線基板のランド電極上に半田実装する際に、半田フラックス成分の上記巻回されたコイル導線１２への濡れ上がりを抑制することができる。 The magnetic powder-containing resin 18 covers the outer periphery of the wound coil conductor 12 after the connection electrodes 16a and 16b and the ends 13a and 13b of the coil conductor 12 are connected by the conductive bonding material 17. When the connection electrodes 16a and 16b of the surface mount coil component 10 are solder-mounted on the land electrodes of the circuit wiring board on which the surface mount coil component 10 is mounted, the solder flux component is formed. It is possible to suppress the wetting of the wound coil conductor wire 12.

（実施例）まず、Ｃｕからなる直径８０μｍの断面丸形の金属線の外周に、厚さ６μｍのポリウレタン樹脂からなる被覆層が形成された市販のポリウレタン被覆導線からなるコイル導線１２を準備した。また、ドラム型コア１１は、磁性材料としてＮｉ−Ｚｎ−Ｃｕ系フェライトの粉末を用い、粉末成型用の有機バインダーを混合して上面１１Ｔ側に段差１５ａ及び斜面１５ｂからなる段部１５を備えた略角柱状の成形体を作成し、研削ホイールを用いて前記成形体の周側面に凹部を形成し、５００℃で脱バインダー処理した後、１１００℃で焼成した。得られたドラム型コア１１は、上鍔部の外形が長さ、幅ともに６．０ｍｍの略８角形状で厚さ０．３６ｍｍである。そして、上面１１Ｔ側の縁１１ｅに沿って、高さ０．０５ｍｍ、幅０．１ｍｍの段差１５ａおよび幅０．１ｍｍの斜面１５ｂからなる段部１５が形成されている。下鍔部１１ｃは、外形が長さ６．８ｍｍ、幅６．０ｍｍの略矩形状で対向する一対の短辺側にそれぞれ前記上鍔部１１ｂの投影領域よりも外側に０．４ｍｍ突出する張り出し部１１ＯＨを有する。そして、前記下鍔部１１ｃの厚さは０．３６ｍｍであり、該下鍔部１１ｃの底面１１Ｂに一対の平行な溝１１Ｅが形成されている。該溝１１Ｅの最大深さは例えば０．１ｍｍである。また、巻芯部１１ａの高さが０．３ｍｍ、巻芯部の直径が３．６ｍｍである。上記ドラム型コア１１の前記下鍔部１１ｃの底面１１Ｂの前記溝１１Ｅに沿って、Ａｇ粉末とホウ珪酸亜鉛系のガラスフリットとを主成分とする焼付型の電極ペーストをラバーパッドを用いた転写法により塗布し焼き付けして、それぞれ接続電極１６ａ，１６ｂを形成した。次に、前記ドラム型コア１１の接続電極１６ａ，１６ｂの表面に、銅めっきを施した後、前記ドラム型コア１１の巻芯１１ａの周囲に前記コイル導線１２を巻回した。次に、前記コイル導１２の端部１２ａ，１２ｂの絶縁被覆を除去し、露出された金属線の端部１３ａ，１３ｂを前記一対の接続電極１６ａ，１６ｂ上に配置して半田鏝を用いて導電性接合剤（半田）により導電接続した。次に、エポキシ樹脂とカルボキシル基変性プロピレングリコールとを５０：５０の重量比で混合した樹脂にＮｉ−Ｚｎ系フェライトの粉末を５０重量％、硬化剤を５重量％、溶剤を１０重量％混合して磁性粉含有樹脂１８のペーストを準備し、上記コイル導線１２が巻回されたドラム型コア１１における前記巻回されたコイル導線１２の外周の上鍔部１１ｂと下鍔部１１ｃとの間に図示省略したディスペンサーを用いて前記上鍔部１１ｂの側面１１Ｓに沿ってノズルＮＺを介して吐出させたのち、１５０℃で１時間加熱して硬化させ、実施例の面実装コイル部品１０を得た。 (Example) First, a coil conductor 12 made of a commercially available polyurethane-coated conductor in which a coating layer made of a polyurethane resin having a thickness of 6 µm was formed on the outer periphery of a metal wire having a round section of 80 µm in diameter made of Cu was prepared. The drum-type core 11 includes Ni-Zn-Cu ferrite powder as a magnetic material, mixed with an organic binder for powder molding, and provided with a step portion 15 including a step 15a and a slope 15b on the upper surface 11T side. A substantially prismatic molded body was prepared, a concave portion was formed on the peripheral side surface of the molded body using a grinding wheel, a binder removal treatment was performed at 500 ° C., and fired at 1100 ° C. The obtained drum core 11 has a substantially octagonal shape with an upper collar portion of 6.0 mm in length and width, and a thickness of 0.36 mm. Then, a step portion 15 including a step 15a having a height of 0.05 mm, a width of 0.1 mm, and a slope 15b having a width of 0.1 mm is formed along the edge 11e on the upper surface 11T side. The lower collar portion 11c has a substantially rectangular shape with a length of 6.8 mm and a width of 6.0 mm, and protrudes 0.4 mm outward from the projection region of the upper collar portion 11b on a pair of opposing short sides. Part 11OH. And the thickness of the said lower collar part 11c is 0.36 mm, and a pair of parallel groove | channels 11E are formed in the bottom face 11B of this lower collar part 11c. The maximum depth of the groove 11E is, for example, 0.1 mm. Moreover, the height of the core part 11a is 0.3 mm, and the diameter of the core part is 3.6 mm. Transfer of a baking type electrode paste mainly composed of Ag powder and zinc borosilicate glass frit along the groove 11E of the bottom surface 11B of the lower collar portion 11c of the drum core 11 using a rubber pad. The coating electrodes 16a and 16b were formed by applying and baking by the method. Next, copper plating was applied to the surfaces of the connection electrodes 16 a and 16 b of the drum core 11, and then the coil conductor 12 was wound around the core 11 a of the drum core 11. Next, the insulation coating of the end portions 12a and 12b of the coil conductor 12 is removed, and the exposed end portions 13a and 13b of the metal wires are placed on the pair of connection electrodes 16a and 16b, and a soldering iron is used. Conductive connection was made with a conductive bonding agent (solder). Next, 50% by weight of Ni—Zn ferrite powder, 5% by weight of a curing agent, and 10% by weight of a solvent are mixed with a resin in which an epoxy resin and a carboxyl group-modified propylene glycol are mixed at a weight ratio of 50:50. The magnetic powder-containing resin 18 paste is prepared, and the drum core 11 around which the coil conductor 12 is wound is wound between the upper flange portion 11b and the lower flange portion 11c of the outer periphery of the wound coil conductor wire 12. After discharging through the nozzle NZ along the side surface 11S of the upper collar portion 11b using a dispenser (not shown), the surface mounting coil component 10 of the example was obtained by heating at 150 ° C. for 1 hour to cure. .

（比較例）前記上鍔部１１ｂの上面側に段差１５を設けないこと以外は前記実施例と同様にして比較例の面実装コイル部品を得た。上記で得られた実施例及び比較例の面実装コイル部品各１００００個について、それぞれ前記上鍔部の上面側にはみ出した磁性粉含有樹脂が前記上鍔部の上面より上方に突出した不具合品を外観検査にて検出した。この結果、実施例の不具合品は０．２３％であった。また、比較例の不具合品は３．２％であった。 (Comparative Example) A surface mount coil component of a comparative example was obtained in the same manner as in the above example, except that the step 15 was not provided on the upper surface side of the upper flange portion 11b. For each of the 10,000 surface mount coil components of the examples and comparative examples obtained above, a defective product in which the magnetic powder-containing resin protruding from the upper surface side of the upper collar part protrudes above the upper surface of the upper collar part Detected by appearance inspection. As a result, the defective product of the example was 0.23%. Moreover, the defective product of the comparative example was 3.2%.

次に、本発明の面実装コイル部品の第２の実施形態について、図７及び図８を参照して説明する。図７は第２の実施形態の面実装コイル部品２０の内部構造を示す縦断面図である。図８は上記実施形態の面実装コイル部品２０の要部を示す上記図７の破線Ｄで囲まれる領域の要部拡大断面図である。 Next, a second embodiment of the surface mount coil component of the present invention will be described with reference to FIGS. FIG. 7 is a longitudinal sectional view showing the internal structure of the surface mount coil component 20 of the second embodiment. FIG. 8 is an enlarged cross-sectional view of a main part of a region surrounded by a broken line D in FIG. 7 showing a main part of the surface mount coil component 20 of the above embodiment.

図７に示すように、本実施形態の面実装コイル部品２０は、軟磁性材料からなるドラム型コア２１と、該ドラム型コア２１に巻回されたコイル導線２２と、を有するものである。さらに、上記コイル導線２２の端部２３ａ，２３ｂはそれぞれ該ドラム型コア２１の下鍔部２１ｃの表面に形成された一対の接続電極２６ａ，２６ｂに半田等の導電性接合材２７により導電接続されている。そして、前記巻回されたコイル導線２２を被覆する磁性粉含有樹脂２８を有する。 As shown in FIG. 7, the surface mount coil component 20 of the present embodiment has a drum core 21 made of a soft magnetic material and a coil conductor 22 wound around the drum core 21. Further, the end portions 23a and 23b of the coil conductor 22 are electrically connected to a pair of connection electrodes 26a and 26b formed on the surface of the lower flange portion 21c of the drum core 21 by a conductive bonding material 27 such as solder. ing. And it has the magnetic powder containing resin 28 which coat | covers the said wound coil conducting wire 22. FIG.

より具体的には、前記ドラム型コア２１は、巻芯部２１ａと該巻芯部２１ａの上端に設けられた上鍔部２１ｂと前記巻芯部２１ａの下端に設けられた下鍔部２１ｃとから成る。前記上鍔部２１ｂは、平面視形状が多角形（例えば８角形）に形成されている。そして、該上鍔部２１ｂは上面２１Ｔ側に該上鍔部２１ｂ
の縁２１ｅに沿って厚さ方向の段部２５が形成されている。図８に示すように、本実施形態の面実装コイル部品２０において、前記厚さ方向の段部２５は、前記上鍔部２１ｂの上面２１Ｔと並行な複数段の段差２５ａ，２５ｂからなり、該厚さ方向の段部２５と前記上鍔部２１ｂの上面２１Ｔとで規制される前記段部２５上の空間２５Ｓを有する。前記下鍔部２１ｃは略矩形状に形成されている。そして該下鍔部２１ｃは側面の一部に前記上鍔部２１ｂの投影領域よりも外側に突出する張り出し部２１ＯＨを有する。また、前記下鍔部２１ｃは、前記巻芯部２１ａの延長上を挟むように底面２１Ｂに一対の平行な溝２１Ｅを備える。前記接続電極２６ａ，２６ｂは、例えば前記下鍔部２１ｃの底面２１Ｂに形成された溝２１Ｅの内面に沿って、それぞれ短冊状に形成されている。そして、ドラム型コア２１の巻芯部２１ａの周囲に巻回された前記コイル導線２２の端部は、前記下鍔部２１ｃの底面２１Ｂの前記溝２１Ｅに沿って折り返され、その先端側の絶縁被覆が剥離されて露出された金属線の端部２３ａ，２３ｂが前記接続電極２６ａ、２６ｂに半田等の導電性接合材２７により導電接続されている。 More specifically, the drum core 21 includes a core part 21a, an upper collar part 21b provided at the upper end of the core part 21a, and a lower collar part 21c provided at the lower end of the core part 21a. Consists of. The upper collar portion 21b is formed in a polygonal shape (for example, an octagon) in plan view. The upper collar portion 21b is arranged on the upper surface 21T side.
A step 25 in the thickness direction is formed along the edge 21e. As shown in FIG. 8, in the surface mount coil component 20 of the present embodiment, the step portion 25 in the thickness direction is composed of a plurality of steps 25a and 25b parallel to the upper surface 21T of the upper flange portion 21b. A space 25S on the step portion 25 is defined by the step portion 25 in the thickness direction and the upper surface 21T of the upper flange portion 21b. The lower collar portion 21c is formed in a substantially rectangular shape. The lower flange portion 21c has an overhanging portion 21OH protruding outside the projection region of the upper flange portion 21b on a part of the side surface. Further, the lower collar portion 21c includes a pair of parallel grooves 21E on the bottom surface 21B so as to sandwich the extension of the core portion 21a. The connection electrodes 26a and 26b are each formed in a strip shape, for example, along the inner surface of the groove 21E formed in the bottom surface 21B of the lower collar portion 21c. The end portion of the coil conductor 22 wound around the core portion 21a of the drum core 21 is folded back along the groove 21E of the bottom surface 21B of the lower collar portion 21c, and the tip end side of the end is insulated. The ends 23a and 23b of the metal wire exposed by peeling off the coating are conductively connected to the connection electrodes 26a and 26b by a conductive bonding material 27 such as solder.

また、本実施形態の面実装コイル部品２０は、前記ドラム型コア２１の巻芯部２１ａに巻回されたコイル導線２２を被覆するように、前記上鍔部２１ｂと下鍔部２１ｃとの間に前記上鍔部２１ｂの側面２１Ｓに沿って磁性粉含有樹脂２８が吐出され硬化されている。この結果、前記磁性粉含有樹脂２８は前記上鍔部２１ｂと前記下鍔部２１ｃとの間に前記上鍔部２１ｂの側面２１Ｓから前記下鍔部２１ｃの対向する縁に亘って形成されている。 In addition, the surface mount coil component 20 of the present embodiment is provided between the upper flange portion 21b and the lower flange portion 21c so as to cover the coil conductor 22 wound around the core portion 21a of the drum core 21. The magnetic powder-containing resin 28 is discharged and cured along the side surface 21S of the upper flange portion 21b. As a result, the magnetic powder-containing resin 28 is formed between the upper flange portion 21b and the lower flange portion 21c from the side surface 21S of the upper flange portion 21b to the opposite edge of the lower flange portion 21c. .

本実施形態の面実装コイル部品２０が先の実施形態の面実装コイル部品１０と異なる点は、上記ドラム型コア２１の上鍔部２１ｂの厚さ方向の段部２５が複数段の段差２５ａ，２５ｂからなるものに変更されている。また、上記変更に伴い、前記ドラム型コア２１の上鍔部２１ｂの上面２１Ｔ側の前記段部２５上に形成される空間２５Ｓも複数の段差からなるものに変更されている。その他の構成及び作用効果は先の第１の実施形態と同様であるため、説明を省略する。 The surface mount coil component 20 of the present embodiment is different from the surface mount coil component 10 of the previous embodiment in that the step portion 25 in the thickness direction of the upper collar portion 21b of the drum core 21 has a plurality of steps 25a, 25b has been changed. With the above change, the space 25S formed on the step portion 25 on the upper surface 21T side of the upper flange portion 21b of the drum core 21 is also changed to a plurality of steps. Other configurations and operational effects are the same as in the first embodiment, and a description thereof will be omitted.

本発明によれば、携帯型の電子機器や薄型の電子機器等に用いられる面実装コイル部品に好適である。 The present invention is suitable for surface mount coil components used in portable electronic devices, thin electronic devices, and the like.

本発明の面実装コイル部品の第１の実施形態の全体構造を示す外観斜視図である。It is an external appearance perspective view which shows the whole structure of 1st Embodiment of the surface mount coil components of this invention. 上記第１の実施形態の面実装コイル部品の内部構造を示す上記図１のＡ−Ａ線における縦断面図である。It is a longitudinal cross-sectional view in the AA line of the said FIG. 1 which shows the internal structure of the surface mount coil component of the said 1st Embodiment. 上記第１の実施形態の面実装コイル部品の要部を示す上記図２の破線Ｂで囲まれる領域の要部拡大断面図である。It is a principal part expanded sectional view of the area | region enclosed with the broken line B of the said FIG. 2 which shows the principal part of the surface mount coil components of the said 1st Embodiment. 上記第１の実施形態の面実装コイル部品に用いるドラム型コアの一例を示す外観斜視図である。It is an external appearance perspective view which shows an example of the drum type core used for the surface mount coil components of the said 1st Embodiment. 上記第１の実施形態の面実装コイル部品に磁性粉含有樹脂を塗布する方法の一例を示す縦断面図である。It is a longitudinal cross-sectional view which shows an example of the method of apply | coating magnetic powder containing resin to the surface mount coil components of the said 1st Embodiment. 上記第１の実施形態の面実装コイル部品に上方から外部応力が付加される様子を示す縦断面図である。It is a longitudinal cross-sectional view which shows a mode that external stress is added to the surface mount coil components of the said 1st Embodiment from upper direction. 本発明の面実装コイル部品の第２の実施形態の内部構造を示す縦断面図である。It is a longitudinal cross-sectional view which shows the internal structure of 2nd Embodiment of the surface mount coil components of this invention. 上記第２の実施形態の面実装コイル部品の要部を示す上記図７の破線Ｄで囲まれる領域の要部拡大断面図である。It is a principal part expanded sectional view of the area | region enclosed with the broken line D of the said FIG. 7 which shows the principal part of the surface-mount coil component of the said 2nd Embodiment. 背景技術の面実装コイル部品の一例を示す外観斜視図である。It is an external appearance perspective view which shows an example of the surface mount coil components of background art.

符号の説明Explanation of symbols

１０：面実装コイル部品１１：ドラム型コア１１ａ：巻芯部１１ｂ：上鍔部１１ｃ：下鍔部１１ｅ：縁１１Ｂ：下鍔部の底面１１Ｅ：溝１１ＯＨ：張り出し部１１Ｓ：上鍔部の側面１１Ｔ：上鍔部の上面１２：コイル導線１２ａ，１２ｂ：端部１３ａ，１３ｂ：端部１５：段部１５ａ：段差１５ｂ：斜面１５Ｓ：空間１６ａ，１６ｂ：接続電極１７：導電性接合材１８：磁性粉含有樹脂２０：面実装コイル部品２１：ドラム型コア２１ａ：巻芯部２１ｂ：上鍔部２１ｃ：下鍔部２１ｅ：縁２１Ｂ：下鍔部の底面２１Ｅ：溝２１ＯＨ：張り出し部２１Ｓ：上鍔部の側面２１Ｔ：上鍔部の上面２２：コイル導線２２ａ，２２ｂ：端部２３ａ，２３ｂ：端部２５：段部２５ａ：段差２５ｂ：段差２５Ｓ：空間２６ａ，２６ｂ：接続電極２７：導電性接合材２８：磁性粉含有樹脂ＮＺ：ノズル 10: Surface mount coil component 11: Drum type core 11a: Core part 11b: Upper collar part 11c: Lower collar part 11e: Edge 11B: Bottom surface of lower collar part 11E: Groove 11OH: Overhang part 11S: Side surface of upper collar part 11T: Upper surface of upper collar 12: Coil conductors 12a, 12b: Ends 13a, 13b: End 15: Step 15a: Step 15b: Slope 15S: Spaces 16a, 16b: Connection electrode 17: Conductive bonding material 18: Magnetic powder-containing resin 20: surface mount coil component 21: drum core 21a: core 21b: upper collar 21c: lower collar 21e: edge 21B: bottom surface 21E of lower collar: groove 21OH: overhang 21S: upper Side surface 21T of the collar portion: Upper surface 22 of the upper collar portion: Coil conductors 22a, 22b: End portions 23a, 23b: End portion 25: Step portion 25a: Step 25b: Step 25S: Space 26a, 26b: Connection electrode 27: Conductivity Mixture material 28: magnetic powder-containing resin NZ: nozzle

Claims

巻芯部と該巻芯部の上端に設けられた上鍔部と前記巻芯部の下端に設けられた下鍔部とから成るドラム型コアと、前記巻芯部の周囲に巻回されたコイル導線と、前記巻回されたコイル導線を被覆する磁性粉含有樹脂と、を有する面実装コイル部品において、前記下鍔部は前記上鍔部の投影領域よりも外側に突出する張り出し部を備え、前記上鍔部は上面側に該上鍔部の縁に沿って厚さ方向の段部が形成されており、前記磁性粉含有樹脂は前記上鍔部と前記下鍔部との間に前記上鍔部の側面から前記下鍔部の対向する縁に亘って形成されたことを特徴とする面実装コイル部品。 A drum core comprising a core part, an upper collar part provided at the upper end of the core part, and a lower collar part provided at the lower end of the core part, and wound around the core part In a surface mount coil component having a coil conductor and a magnetic powder-containing resin that covers the wound coil conductor, the lower collar includes a projecting portion that projects outward from the projection region of the upper collar. The upper collar part has a step in the thickness direction formed on the upper surface side along the edge of the upper collar part, and the magnetic powder-containing resin is disposed between the upper collar part and the lower collar part. A surface-mounted coil component formed from a side surface of an upper collar part to an opposite edge of the lower collar part.