JP2015122387A - Surface-mount inductor - Google Patents

Surface-mount inductor Download PDF

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JP2015122387A
JP2015122387A JP2013264712A JP2013264712A JP2015122387A JP 2015122387 A JP2015122387 A JP 2015122387A JP 2013264712 A JP2013264712 A JP 2013264712A JP 2013264712 A JP2013264712 A JP 2013264712A JP 2015122387 A JP2015122387 A JP 2015122387A
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coil
terminal electrode
molded body
mount inductor
molding
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JP6206164B2 (en
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齋藤　公一
Koichi Saito
公一 齋藤
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Toko Inc
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Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive and high-performance surface-mount inductor which eliminates directivity due to polarity.SOLUTION: The surface-mount inductor includes a coil 11 formed by winding a conductor, and a molding 12 in which the coil is sealed with a sealing material containing a resin and a filler. The coil is embedded in the columnar molding, and a lead-out end of the coil is led out to the bottom surface of the molding. A first terminal electrode 13A is formed at the center of the bottom surface of the molding, and a second terminal electrode 13B surrounding the first terminal electrode is formed on the bottom surface of the molding.

Description

本発明は、導線を巻回して形成したコイルと、コイルが樹脂と充填材を含む封止材で封止した成形体を備えた表面実装インダクタに関するものである。   The present invention relates to a surface mount inductor including a coil formed by winding a conductive wire and a molded body in which the coil is sealed with a sealing material including a resin and a filler.

従来の表面実装インダクタに、図４に示す様に、導線を巻回してコイル４１を形成し、このコイル４１を磁性粉末と樹脂を含む封止材で形成された成形体４２内に埋設したものがある（例えば、特許文献１を参照。）。コイル４１は、その巻軸が実装面と垂直になる様に成形体４２内に埋設され、引き出し端が成形体４２の表面に引き出される。コイルの引き出し端は成形体に形成された外部端子４３に接続される。   As shown in FIG. 4, a coil 41 is formed by winding a conducting wire on a conventional surface mount inductor, and this coil 41 is embedded in a molded body 42 formed of a sealing material containing magnetic powder and resin. (For example, refer to Patent Document 1). The coil 41 is embedded in the molded body 42 so that the winding axis thereof is perpendicular to the mounting surface, and the lead-out end is pulled out to the surface of the molded body 42. The lead end of the coil is connected to an external terminal 43 formed on the molded body.

特開２０１０−２４５４７３号公報JP 2010-245473 A

この様な従来の表面実装インダクタは、端子間に流す電流の向きにより、磁界の方向が変わるため、実装する向きによって磁気回路の磁気抵抗が変わり、特性が変動するという問題があった。そのため、この様な従来の表面実装インダクタは、成形体に極性表示を設ける必要があった。また、従来の表面実装インダクタは、製品を出荷するために用いられるテーピング内で表面実装インダクタの方向を揃える必要があるため、成形体に極性表示を設けているにも係らず画像検査による方向選別や配列をする工程が必要だった。
また、従来の別の表面実装インダクタに、巻軸の両端に円板状の鍔を設けたフェライトコアの巻軸に導線を巻回し、導線の端部をフェライトコアの鍔に設けた外部端子に接続したものがある。この様な従来の表面実装インダクタは、安価で加工性も良いため、広く用いられているが、テーピング内で回転しない様に、外部端子に形状に工夫をした金属板を用いて製品の上面から見た形状を長方形や正方形したり、フェライトコアの鍔の形状を多角形の板状にしたりする必要があり、電気特性の設計上の制約があった。
さらに、この種の表面実装インダクタは、製造工程の作業性を考えた場合も、治具によるハンドリングやパーツフィーダーで流動するうえで、方向性を持たない方が好ましいという状況にあった。 Such a conventional surface-mount inductor has a problem that the direction of the magnetic field changes depending on the direction of the current flowing between the terminals, so that the magnetic resistance of the magnetic circuit changes depending on the mounting direction and the characteristics fluctuate. Therefore, such a conventional surface-mount inductor needs to be provided with a polarity indication on the molded body. In addition, since conventional surface mount inductors require the orientation of the surface mount inductor to be aligned within the taping used to ship products, direction selection by image inspection despite the presence of polarity indication on the molded product And the process of arranging was necessary.
Also, in another conventional surface mount inductor, a conducting wire is wound around the winding core of a ferrite core provided with a disk-like collar on both ends of the winding axis, and the end of the conducting wire is connected to an external terminal provided on the collar of the ferrite core. There is something connected. Such conventional surface-mount inductors are widely used because they are inexpensive and have good workability, but from the top surface of the product using a metal plate that is devised for the external terminals so that they do not rotate within the taping. It was necessary to make the shape of the rectangle rectangular or square, and the shape of the ferrite core ridge to be a polygonal plate, which had restrictions on the design of electrical characteristics.
Furthermore, this type of surface-mount inductor is in a situation where it is preferable that the surface-mount inductor does not have directionality in terms of handling with a jig or a parts feeder, considering the workability of the manufacturing process.

本発明は、極性による方向性をなくして安価で高性能な表面実装インダクタを提供することを目的とする。   An object of the present invention is to provide an inexpensive and high-performance surface-mount inductor that eliminates directionality due to polarity.

本発明は、導線を巻回して形成したコイルと、コイルが樹脂と充填材を含む封止材で封止された成形体を備えた表面実装インダクタにおいて、コイルは、柱状の成形体内に埋設され、引き出し端が成形体の底面に引き出され、成形体の底面に、第１の端子電極と、第１の端子電極を取り囲む様に形成された第２の端子電極を形成する。   The present invention relates to a surface-mount inductor including a coil formed by winding a conductive wire and a molded body in which the coil is sealed with a sealing material including a resin and a filler. The coil is embedded in a columnar molded body. The lead-out end is pulled out to the bottom surface of the molded body, and the first terminal electrode and the second terminal electrode formed so as to surround the first terminal electrode are formed on the bottom surface of the molded body.

本発明は、導線を巻回して形成したコイルと、コイルが樹脂と充填材を含む封止材で封止された成形体を備えた表面実装インダクタにおいて、コイルは、柱状の成形体内に埋設され、引き出し端が成形体の底面に引き出され、成形体の底面に、第１の端子電極と、第１の端子電極を取り囲む様に形成された第２の端子電極を形成するので、極性による方向性をなくすことができ、製造コストを削減でき、さらに、磁気特性を向上させることができる。   The present invention relates to a surface-mount inductor including a coil formed by winding a conductive wire and a molded body in which the coil is sealed with a sealing material including a resin and a filler. The coil is embedded in a columnar molded body. The lead end is drawn out to the bottom surface of the molded body, and the first terminal electrode and the second terminal electrode formed so as to surround the first terminal electrode are formed on the bottom surface of the molded body. Performance can be eliminated, manufacturing costs can be reduced, and magnetic properties can be improved.

本発明の表面実装インダクタの実施例を示す斜視図である。It is a perspective view which shows the Example of the surface mount inductor of this invention. 本発明の表面実装インダクタの製造方法を示す斜視図である。It is a perspective view which shows the manufacturing method of the surface mount inductor of this invention. 本発明の表面実装インダクタの別の製造方法を示す斜視図である。It is a perspective view which shows another manufacturing method of the surface mount inductor of this invention. 従来の表面実装インダクタを示す斜視図である。It is a perspective view which shows the conventional surface mount inductor.

本発明の表面実装インダクタは、導線を巻回して形成したコイルと、コイルが樹脂と充填材を含む封止材で封止した成形体を備える。コイルは、導線を巻回して空芯コイルが形成され、内周と外周から底面側に引き出し端が引き出される。このコイルは、引き出し端が成形体の底面に露出する様に、樹脂と充填材を含む封止材で封止され、柱状の成形体が形成される。コイルが埋設された成形体の底面には、中央部に第１の端子電極が形成され、外縁部にこの第１の端子電極を取り囲む様に第２の端子電極が形成される。この第１の端子電極と第２の端子電極にそれぞれコイルの引き出し端が接続されることにより、第１の端子電極と第２の端子電極間にコイルが接続される。従って、本発明の表面実装インダクタは、成形体の底面に、一方の端子を取り囲む様に他方の端子が形成されるので、成形体の底面をどの様に配置しても磁気回路の磁気抵抗は同じにすることができる。
また、本発明の表面実装インダクタは、引き出し端が成形体の底面に露出する様に形成されるので、製造工程を簡素化できると共に、表面実装インダクタの大きさを変えることなく、成形体のコイル以外の部分の体積を大きくでき、それによって磁気特性を改善できる。 The surface-mount inductor of the present invention includes a coil formed by winding a conductive wire, and a molded body in which the coil is sealed with a sealing material including a resin and a filler. The coil is formed by winding a conducting wire to form an air-core coil, and a leading end is drawn from the inner periphery and outer periphery to the bottom surface side. The coil is sealed with a sealing material including a resin and a filler so that the drawn end is exposed on the bottom surface of the molded body, thereby forming a columnar molded body. A first terminal electrode is formed at the center of the bottom surface of the molded body in which the coil is embedded, and a second terminal electrode is formed at the outer edge so as to surround the first terminal electrode. By connecting the leading end of the coil to the first terminal electrode and the second terminal electrode, respectively, the coil is connected between the first terminal electrode and the second terminal electrode. Therefore, in the surface mount inductor of the present invention, since the other terminal is formed so as to surround one terminal on the bottom surface of the molded body, the magnetic resistance of the magnetic circuit is not limited by any arrangement of the bottom surface of the molded body. Can be the same.
Further, since the surface mount inductor of the present invention is formed so that the lead-out end is exposed on the bottom surface of the molded body, the manufacturing process can be simplified and the coil of the molded body can be changed without changing the size of the surface mounted inductor. The volume of the other part can be increased, thereby improving the magnetic properties.

以下、本発明の表面実装インダクタの実施例を図１乃至図３を参照して説明する。
図１は本発明の表面実装インダクタの実施例を示す斜視図である。
図１において、１１はコイル、１２は成形体である。
コイル１１は、導線を巻回して空芯コイルが形成される。導線は断面が円形の丸線が用いられる。このコイル１１の内周側からは引き出し端１１Ａが引き出される。また、このコイル１１の外周側からは引き出し端１１Ｂが引き出される。この引き出し端１１Ａと引き出し端１１Ｂは、コイルの底面側に引き出される。
成形体１２は、樹脂と充填材を含む封止材を用いて円柱状に形成されて、内部にコイル１１が埋設され、底面にコイルの引き出し端１１Ａと引き出し端１１Ｂが露出する。充填材としては、フェライト等の磁性体粉や金属磁性体粉が用いられる。この成形体１２の底面には第１の端子電極１３Ａと第２の端子電極１３Ｂが形成される。第１の端子電極１３Ａと第２の端子電極１３Ｂは、銀、銀パラジウム、銀、銅等の導電材料を用いて形成される。第１の端子電極１３Ａは、成形体１２の底面の中央部に円形に形成され、コイル１１の引き出し端１１Ａと接続される。また、第２の端子電極１３Ｂは、成形体１２の底面の外縁部に、第１の端子電極１３Ａと離間して、第１の端子電極１３Ａを取り囲む様に、環状に形成され、コイル１１の引き出し端１１Ｂと接続される。 Embodiments of the surface mount inductor according to the present invention will be described below with reference to FIGS.
FIG. 1 is a perspective view showing an embodiment of a surface mount inductor according to the present invention.
In FIG. 1, 11 is a coil and 12 is a molded body.
The coil 11 is formed by winding a conducting wire to form an air-core coil. As the conducting wire, a round wire having a circular cross section is used. A lead end 11A is drawn from the inner peripheral side of the coil 11. Further, a lead-out end 11B is drawn out from the outer peripheral side of the coil 11. The lead-out end 11A and the lead-out end 11B are drawn out to the bottom surface side of the coil.
The molded body 12 is formed in a cylindrical shape using a sealing material including a resin and a filler, and the coil 11 is embedded therein, and the lead-out end 11A and the lead-out end 11B of the coil are exposed on the bottom surface. As the filler, magnetic powder such as ferrite or metal magnetic powder is used. A first terminal electrode 13A and a second terminal electrode 13B are formed on the bottom surface of the molded body 12. The first terminal electrode 13A and the second terminal electrode 13B are formed using a conductive material such as silver, silver palladium, silver, or copper. The first terminal electrode 13 </ b> A is formed in a circular shape at the center of the bottom surface of the molded body 12 and is connected to the lead-out end 11 </ b> A of the coil 11. Further, the second terminal electrode 13B is formed in an annular shape on the outer edge of the bottom surface of the molded body 12 so as to be separated from the first terminal electrode 13A and surround the first terminal electrode 13A. Connected to the drawer end 11B.

この様な表面実装インダクタは次の様にして製造される。まず、図２（Ａ）に示す様に、導線を巻回して、その内周から引き出し端２１Ａが、外周から引き出し端２１Ｂが底面側にそれぞれ引き出された、空芯のコイル２１が形成される。導線は丸線が用いられる。
次に、図２（Ｂ）に示す様に、このコイル２１を、底面を上にした状態で、樹脂と充填材を含む封止材を用いて有底の円筒状に形成された封止部材２２Ａ内に収容する。充填材としては、フェライト等の磁性体粉や金属磁性体粉が用いられる。
続いて、このコイル２１が収容された封止部材２２Ａ内に、樹脂と充填材を含む封止材を充填してコイル２１を封止し、これを成形金型内に収容し、全体を１２０〜２５０℃で圧縮成型することにより、図２（Ｃ）に示す様に、コイルが埋設された成形体２２が形成される。
最後に、この成形体２２の底面に、銀、銀パラジウム、銀、銅等の導電材料を含有した導体ペーストを塗布して、図１（Ｂ）に示す様に、成形体１２の底面に第１の端子電極１３Ａと第２の端子電極１３Ｂが形成される。第１の端子電極１３Ａはコイルの引き出し端２１Ａと接続される。また、第２の端子電極１３Ｂはコイルの引き出し端２１Ｂと接続される。 Such a surface mount inductor is manufactured as follows. First, as shown in FIG. 2 (A), an air-core coil 21 is formed by winding a conducting wire and drawing out the lead end 21A from the inner periphery and the lead end 21B from the outer periphery to the bottom surface side. . A round wire is used as the conducting wire.
Next, as shown in FIG. 2 (B), a sealing member formed into a bottomed cylindrical shape using a sealing material containing a resin and a filler with the coil 21 facing up. Housed in 22A. As the filler, magnetic powder such as ferrite or metal magnetic powder is used.
Subsequently, the sealing member 22A in which the coil 21 is accommodated is filled with a sealing material containing a resin and a filler, and the coil 21 is sealed. The coil 21 is accommodated in a molding die. By compression molding at ˜250 ° C., a molded body 22 in which a coil is embedded is formed as shown in FIG.
Finally, a conductive paste containing a conductive material such as silver, silver palladium, silver, or copper is applied to the bottom surface of the molded body 22, and as shown in FIG. One terminal electrode 13A and a second terminal electrode 13B are formed. The first terminal electrode 13A is connected to the coil drawing end 21A. The second terminal electrode 13B is connected to the coil drawing end 21B.

以上、本発明の表面実装インダクタの実施例を述べたが、本発明はこれらの実施例に限定されるものではない。例えば、封止部材は、樹脂と充填材を含む封止材を用いて、図３（Ａ）に示す様に、円板状部３２Ａ１とこの円板状部３２Ａ１の上面中央部に凸部３２Ａ２を備えたＴ字状の封止部材３２Ａが用いられても良い。この場合、この封止部材３２Ａの円板状部３２Ａ１上に、コイル２１の底面を上にした状態で、空芯部分が凸部３２に嵌る様に搭載し、これを成形金型内に収容し、成形金型内に樹脂と充填材を含む封止材をさらに充填し、全体を１２０〜２５０℃で圧縮成型することにより、コイルが埋設された成形体が形成される。
また、コイルを形成する導線は、断面が角形の平角線が用いられても良い。
さらに、第１の端子電極と第２の端子電極は、成形体の底面において、第１の端子電極が第２の端子電極に取り囲まれる様に形成されれば良く、その形状は様々な形状にすることができる。
また、封止部材と後に充填される封止材は同じ材料が用いられても良いし、異なる材料が用いられてもよい。
さらに、成形体は柱状に形成されていれば良く、様々な形状に形成することができる。 As mentioned above, although the Example of the surface mount inductor of this invention was described, this invention is not limited to these Examples. For example, as shown in FIG. 3A, the sealing member is made of a sealing material containing a resin and a filler. As shown in FIG. 3A, the disk-shaped portion 32A1 and the convex portion 32A2 at the center of the upper surface of the disk-shaped portion 32A1. A T-shaped sealing member 32 </ b> A including the above may be used. In this case, the sealing member 32A is mounted on the disk-shaped portion 32A1 with the bottom surface of the coil 21 facing up so that the air core portion fits into the convex portion 32, and this is accommodated in the molding die. Then, the molding die is further filled with a sealing material containing a resin and a filler, and the whole is compression-molded at 120 to 250 ° C., thereby forming a molded body in which the coil is embedded.
Moreover, the conducting wire which forms a coil may use a rectangular wire with a square cross section.
Furthermore, the first terminal electrode and the second terminal electrode may be formed on the bottom surface of the molded body so that the first terminal electrode is surrounded by the second terminal electrode. can do.
Moreover, the same material may be used for the sealing member and the sealing material filled later, and different materials may be used.
Furthermore, the molded body only needs to be formed in a columnar shape, and can be formed in various shapes.

１１ コイル
１２ 成形体 11 Coil 12 Molded body

Claims (3)

導線を巻回して形成したコイルと、該コイルが樹脂と充填材を含む封止材で封止された成形体を備えた表面実装インダクタにおいて、
該コイルは、柱状の成形体内に埋設され、引き出し端が該成形体の底面に引き出され、
該成形体の底面に、第１の端子電極と、該第１の端子電極を取り囲む様に形成された第２の端子電極を形成したことを特徴とする表面実装インダクタ。 In a surface mount inductor comprising a coil formed by winding a conductive wire, and a molded body in which the coil is sealed with a sealing material containing a resin and a filler,
The coil is embedded in a columnar molded body, and the leading end is pulled out to the bottom surface of the molded body,
A surface-mount inductor, wherein a first terminal electrode and a second terminal electrode formed so as to surround the first terminal electrode are formed on a bottom surface of the molded body. 前記成形体が円柱状に形成された請求項１に記載の表面実装インダクタ。   The surface-mount inductor according to claim 1, wherein the molded body is formed in a cylindrical shape. 前記第１の端子電極が円形に形成された請求項１又は請求項２に記載の表面実装インダクタ。   The surface mount inductor according to claim 1, wherein the first terminal electrode is formed in a circular shape.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02228013A (en) * 1989-02-28 1990-09-11 Sony Corp Manufacture of molded coil
JPH04337609A (en) * 1991-05-14 1992-11-25 Nippon Parts Kk Surface mounted electronic parts
US5898574A (en) * 1997-09-02 1999-04-27 Tan; Wiling Self aligning electrical component
JP2009253113A (en) * 2008-04-08 2009-10-29 Shinto Holdings Kk Inductor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02228013A (en) * 1989-02-28 1990-09-11 Sony Corp Manufacture of molded coil
JPH04337609A (en) * 1991-05-14 1992-11-25 Nippon Parts Kk Surface mounted electronic parts
US5898574A (en) * 1997-09-02 1999-04-27 Tan; Wiling Self aligning electrical component
JP2009253113A (en) * 2008-04-08 2009-10-29 Shinto Holdings Kk Inductor

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