JP2022135228A - Method for manufacturing inductor - Google Patents

Method for manufacturing inductor Download PDF

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JP2022135228A
JP2022135228A JP2021034893A JP2021034893A JP2022135228A JP 2022135228 A JP2022135228 A JP 2022135228A JP 2021034893 A JP2021034893 A JP 2021034893A JP 2021034893 A JP2021034893 A JP 2021034893A JP 2022135228 A JP2022135228 A JP 2022135228A
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magnetic powder
resin
inductor
runner
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JP7482352B2 (en
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暁洋 星合
Akihiro Hoshiai
洋一 西嶋
Yoichi Nishijima
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Panasonic Intellectual Property Management Co Ltd
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Abstract

To provide a method for manufacturing an inductor that enable efficient production of an inductor having small variation in inductance value.SOLUTION: In a method for manufacturing an inductor in which a coil element 12 mounted on a coil mounting portion of a serial type lead frame 11 and a terminal portion are connected to each other, and then clamped into a mold 14 having a plurality of cavity portions 13 and runner portions 17 which are arranged in series, and resin-kneaded magnetic powder 16 heated in a pot 15 is injected into the cavity portions 13 via a cull runner 18 by a plunger 19, and solidified by heat curing to seal a coil element assembly, the magnetic powder weight ratio of the resin-kneaded magnetic powder 16 at a portion near the cull-runner 18 is set to be smaller than the magnetic powder weight ratio of the resin-kneaded magnetic powder 16 at a portion far from the cull-runner 18.SELECTED DRAWING: Figure 2

Description

本発明は、導線を巻いてコイルが形成され、コイルが磁性体粉末とバインダ材料とを含有する複合磁性材料で形成された成形体内に埋設されたインダクタの製造方法に関するものである。 The present invention relates to a method of manufacturing an inductor in which a conductor wire is wound to form a coil, and the coil is embedded in a compact made of a composite magnetic material containing magnetic powder and a binder material.

近年携帯電話や車載デバイスにおける電子部品に対する小型化のニーズが高まっている。これに対し、コイルを磁性材料の内部に埋設することによって、小さいサイズにおいても所定のインダクタンス値が得られるように設計されたコイル部品が開発されている。従来のインダクタはコイルと圧粉磁性粉を金型に入れ、圧力を加えて成形する圧粉成形が多く使われてきた。しかしながらインダクタが小型になってくると個々の成形が難しくなり、量産性に欠けていた。これに対して、半導体部品で多く用いられているトランスファーモールドを応用することも可能である。 In recent years, there has been an increasing need for miniaturization of electronic components in mobile phones and in-vehicle devices. On the other hand, a coil component designed to obtain a predetermined inductance value even in a small size has been developed by embedding a coil inside a magnetic material. For conventional inductors, powder compaction, in which a coil and compacted magnetic powder are placed in a mold and molded by applying pressure, has often been used. However, as inductors became smaller, individual molding became difficult, and mass production was lacking. On the other hand, it is also possible to apply transfer molding, which is often used for semiconductor parts.

なお、この出願の発明に関連する先行技術文献情報としては、例えば、特許文献1が知られている。 For example, Patent Document 1 is known as prior art document information related to the invention of this application.

特開2012-18974号公報JP 2012-18974 A

しかしながら、複数個連結した成形型でトランスファー成形を行うと、成形樹脂にフィラーが含有されていると、注入口から遠い部分では樹脂分が多く流れ込み、結果として場所によりフィラーの量が異なってしまう場合がある。半導体部品でもモールド樹脂にシリカフィラーを混ぜて成形するものの、半導体部品の場合シリカフィラーが偏在しても特性にはほとんど影響しない。これに対してインダクタの場合、磁性体粉末が偏在すると透磁率が変動し、結果としてインダクタンス値にばらつきが生じてしまう。 However, when transfer molding is performed with multiple connected molds, if the molding resin contains filler, a large amount of resin will flow into the part far from the injection port, and as a result, the amount of filler will vary depending on the location. There is Although semiconductor parts are also molded by mixing silica filler with molding resin, in the case of semiconductor parts, uneven distribution of silica filler has little effect on the characteristics. On the other hand, in the case of an inductor, if the magnetic powder is unevenly distributed, the magnetic permeability will fluctuate, resulting in variations in the inductance value.

本発明は上記課題を解決するために、直列状リードフレームのコイル搭載部に搭載したコイル素子と端子部とを接続した後、直列状に配列された複数個のキャビティ部、ランナー部を有する上金型と下金型の間にクランプし、ポット内で加熱した樹脂混錬磁性粉をプランジャーによりカルランナーを介してキャビティ部に注入し、熱硬化により固化させ当該コイル素子組立品の封止を行うインダクタの製造方法において、カルランナーに近い部分の樹脂混錬磁性粉の磁性粉重量割合をカルランナーから遠い部分の樹脂混錬磁性粉の磁性粉重量割合よりも小さくしたしたものである。 In order to solve the above problems, the present invention has a plurality of cavity portions and runner portions arranged in series after connecting a coil element mounted on a coil mounting portion of a serial lead frame and a terminal portion. It is clamped between the mold and the lower mold, and the resin-mixed magnetic powder heated in the pot is injected into the cavity through the cull runner by a plunger and solidified by heat curing to seal the coil element assembly. In the inductor manufacturing method, the magnetic powder weight ratio of the resin-mixed magnetic powder in the portion near the cull runner is made smaller than the magnetic powder weight ratio of the resin-mixed magnetic powder in the portion far from the cull runner.

以上のように行うことにより、金型の最終端にも十分な磁性粉を行きわたらせることができ、インダクタンス値のばらつきの小さいインダクタを得ることができる。 By carrying out as described above, sufficient magnetic powder can be distributed even at the final end of the mold, and an inductor with a small variation in inductance value can be obtained.

本発明の一実施の形態におけるインダクタの製造方法におけるインダクタの成形後の上面図FIG. 4 is a top view of the inductor after molding in the inductor manufacturing method according to the embodiment of the present invention; 本発明の一実施の形態におけるインダクタの製造方法に用いるインダクタ製造装置の断面図1 is a cross-sectional view of an inductor manufacturing apparatus used in an inductor manufacturing method according to an embodiment of the present invention; FIG. 本発明の一実施の形態におけるインダクタの製造方法におけるキャビティ毎のインダクタンス値を示す図FIG. 4 is a diagram showing inductance values for each cavity in the inductor manufacturing method according to the embodiment of the present invention; 本発明の一実施の形態におけるインダクタの製造方法に用いる別のインダクタ製造装置の断面図Sectional view of another inductor manufacturing apparatus used in the inductor manufacturing method according to the embodiment of the present invention

以下、本発明の一実施の形態におけるインダクタの製造方法について、図面を参照しながら説明する。 A method of manufacturing an inductor according to an embodiment of the present invention will be described below with reference to the drawings.

図1は本発明の一実施の形態におけるインダクタの製造方法におけるインダクタの成形後の上面図、図2は本発明の一実施の形態におけるインダクタの製造方法に用いるインダクタ製造装置の断面図である。この製造装置はトランスファー成形によって、リードフレーム11に取り付けられたコイル素子12を中に入れて、樹脂混錬磁性粉の成形を行う上金型14aおよび下金型14bからなる金型14を有している。金型14の中にはキャビティ部13が10個直列状に設けられており、これらのキャビティ部13がランナー部17で等間隔に接続されている。ポット15内に投入した樹脂混錬磁性粉16をプランジャー19によりカルランナー18を介して圧力を加えてキャビティ部13に注入し、それぞれのキャビティ部13に樹脂混錬磁性粉16を充填するものである。 FIG. 1 is a top view of an inductor after molding in an inductor manufacturing method according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of an inductor manufacturing apparatus used in the inductor manufacturing method according to an embodiment of the present invention. This manufacturing apparatus has a mold 14 consisting of an upper mold 14a and a lower mold 14b for molding resin-mixed magnetic powder by inserting a coil element 12 attached to a lead frame 11 by transfer molding. ing. Ten cavity portions 13 are provided in series in the mold 14, and these cavity portions 13 are connected by runner portions 17 at regular intervals. The resin kneaded magnetic powder 16 put into the pot 15 is pressurized by the plunger 19 through the cull runner 18 to be injected into the cavity 13, and each cavity 13 is filled with the resin kneaded magnetic powder 16. is.

まずはコイル搭載部を直列状に形成したリードフレーム11の端子部にそれぞれのコイル素子12を接続する。コイル素子12を接続する方法としては、溶接等を用いることができる。 First, each coil element 12 is connected to a terminal portion of a lead frame 11 in which coil mounting portions are formed in series. Welding or the like can be used as a method for connecting the coil elements 12 .

次にこのリードフレーム11を、コイル素子12が各キャビティ部13に入るように金型14に設定する。金型14は上金型14aと下金型14bとからなり、この間にリードフレーム11を入れて金型14を閉じる。このとき金型14は約165℃に保持されている。 Next, this lead frame 11 is set in a mold 14 so that the coil element 12 is placed in each cavity portion 13 . The mold 14 consists of an upper mold 14a and a lower mold 14b, and the lead frame 11 is placed between them and the mold 14 is closed. At this time, the mold 14 is held at approximately 165°C.

次にポット15内にタブレット状に成形した樹脂混錬粉16を入れて、約165℃に加熱しながら樹脂を溶解させて、プランジャー19によりカルランナー19を介して圧力を加えてキャビティ部13に注入し、それぞれのキャビティ部13に樹脂混錬磁性粉16を充填し熱硬化により固化させ、金型14から取り出して個片化することによりインダクタを得る。ポット15内に樹脂混錬粉16を入れる場合は、下金型14bを下げて上金型14aとの間に隙間を作り、その隙間の間から樹脂混錬磁性粉16をポット15内に投入する等の方法を用いることができる。 Next, a resin kneaded powder 16 molded into a tablet shape is placed in the pot 15, and the resin is melted while being heated to about 165°C. , each cavity 13 is filled with resin-mixed magnetic powder 16, which is solidified by heat curing, taken out from the mold 14, and separated into individual pieces to obtain inductors. When the resin kneaded powder 16 is put into the pot 15, the lower mold 14b is lowered to form a gap with the upper mold 14a, and the resin kneaded magnetic powder 16 is put into the pot 15 through the gap. It is possible to use a method such as

本実施の形態ではポット15の両側にそれぞれ10個のキャビティを設けているが、例えば4個のリードフレームを並列に設け、同時に成形するようにしても構わない。このようにすることにより、さらに効率よく生産することができる。 Although ten cavities are provided on each side of the pot 15 in this embodiment, for example, four lead frames may be provided in parallel and molded at the same time. By doing so, more efficient production can be achieved.

通常このように成形した場合、磁性粉の方が樹脂に比べて密度が高いため、プランジャーで樹脂混錬磁性粉を押し出したときに磁性粉の運動エネルギーの方が樹脂の運動エネルギーよりも大きくなり、キャビティの先端部に磁性粉の方がより多く到達しやすくなる。そのためキャビティ間で磁性粉の割合が異なるインダクタができ、インダクタン値のばらつきが大きくなってしまう。 Normally, when molded in this way, the magnetic powder has a higher density than the resin, so when the resin-mixed magnetic powder is pushed out with a plunger, the kinetic energy of the magnetic powder is greater than that of the resin. This makes it easier for more magnetic powder to reach the tip of the cavity. As a result, inductors with different magnetic powder ratios are formed between cavities, resulting in large variations in inductance values.

これに対して本発明の一実施形態では、磁性粉重量割合の異なる樹脂混錬磁性粉のタブレットを準備し、カルランナー18に近い部分の第1の樹脂混錬磁性粉16aの磁性粉重量割合をカルランナー18から遠い部分の第2の樹脂混錬磁性粉16bの磁性粉重量割合よりも小さくしたものを用いる。例えば第1の樹脂混錬磁性粉16aとして磁性粉重量割合が92wt%のものを用い、第2の樹脂混錬磁性粉16bとして磁性粉重量割合が95wt%のものを用いている。このようにすることにより、先端部のキャビティの磁性粉重量割合が上がりすぎることを防止し、インダクタンス値のばらつきが小さいインダクタを得ることができる。 On the other hand, in one embodiment of the present invention, tablets of resin-mixed magnetic powder having different magnetic powder weight ratios are prepared, and the magnetic powder weight ratio of the first resin-mixed magnetic powder 16a near the cull runner 18 is is smaller than the magnetic powder weight ratio of the second resin-mixed magnetic powder 16b in the portion far from the cull runner 18. For example, a magnetic powder weight ratio of 92 wt % is used as the first resin-mixed magnetic powder 16a, and a magnetic powder weight ratio of 95 wt% is used as the second resin-mixed magnetic powder 16b. By doing so, it is possible to prevent the weight ratio of the magnetic powder in the cavity at the tip from being excessively increased, and to obtain an inductor with a small variation in inductance value.

図3は本発明の一実施の形態におけるインダクタの製造方法におけるキャビティ毎のインダクタンス値を示す図であり、カルランナーに近いキャビティ部から順に1から10までつながっているものである。この図からわかるように、均一の磁性粉重量割合を用いた従来例に対して、インダクタンス値の変動が少ないインダクタを得ることができている。 FIG. 3 is a diagram showing the inductance values for each cavity in the method of manufacturing an inductor according to one embodiment of the present invention, where 1 to 10 are connected in order from the cavity portion closest to the Cull runner. As can be seen from this figure, compared to the conventional example using a uniform magnetic powder weight ratio, an inductor with less variation in inductance value can be obtained.

磁性粉重量割合は、第1の樹脂混錬磁性粉16aと第2の樹脂混錬磁性粉16bとで、1wt%以上、5wt%異ならせることが望ましい。磁性粉重量割合の差が1wt%未満では十分にインダクタンス値のばらつきを抑えられず、5wt%よりも大きくなると先端部のキャビティ内の磁性分量が少なくなりすぎてインダクタンス値のばらつきが大きくなってしまう可能性があるためである。 It is desirable that the weight ratio of the magnetic powder is different between the first resin-mixed magnetic powder 16a and the second resin-mixed magnetic powder 16b by 1 wt % or more and 5 wt %. If the difference in the magnetic powder weight ratio is less than 1 wt%, the variation in the inductance value cannot be sufficiently suppressed, and if it exceeds 5 wt%, the magnetic content in the cavity at the tip becomes too small, resulting in a large variation in the inductance value. This is because it is possible.

なお、上記実施の形態では磁性粉重量割合の異なる2個のタブレット状の第1の樹脂混錬磁性粉16a、第2の樹脂混錬磁性粉16bを用いたが、粉状の磁性粉重量割合の異なる樹脂混錬磁性粉を順次ポット内に投入しても構わない。さらに磁性粉重量割合の異なる3種類以上の樹脂混錬磁性粉を用いても構わない。 In the above embodiment, two tablet-like first resin-mixed magnetic powders 16a and second resin-mixed magnetic powders 16b having different magnetic powder weight ratios were used. Different resin-mixed magnetic powders may be successively charged into the pot. Furthermore, three or more kinds of resin-mixed magnetic powders having different magnetic powder weight ratios may be used.

図4は、本発明の一実施の形態におけるインダクタの製造方法に用いる別のインダクタ製造装置の断面図である。インダクタ製造装置そのものは図2のものと同じであるが、樹脂混錬磁性粉16が異なっている。図2のものは磁性粉重量割合の異なる2個のタブレット状の第1の樹脂混錬磁性粉16aおよび第2の樹脂混錬磁性粉16bを用いているが、図4では磁性粉重量割合の異なる2種類の第1の樹脂混錬磁性粉16aおよび第2の樹脂混錬磁性粉16bを一体化したものを用いている。このようにすることにより樹脂混錬磁性粉の投入する工程を簡略化することができる。この場合タブレットの上下を間違えて投入してしまうとインダクタンス値のばらつきが大きくなってしまう。そのため図4のように、タブレットの形状を上の面から下の面にいくにしたがって径が小さくなる円錐の一部を切り取ったような形状とすることが望ましい。このようにすることにより、上下間違いを防止することができるとともに、投入もしやすくなる。 FIG. 4 is a cross-sectional view of another inductor manufacturing apparatus used in the inductor manufacturing method according to one embodiment of the present invention. The inductor manufacturing apparatus itself is the same as that of FIG. 2, but the resin-mixed magnetic powder 16 is different. 2 uses two tablet-like first resin-kneaded magnetic powders 16a and second resin-kneaded magnetic powders 16b with different magnetic powder weight ratios. Two different types of first resin-mixed magnetic powder 16a and second resin-mixed magnetic powder 16b are integrated. By doing so, the step of charging the resin-mixed magnetic powder can be simplified. In this case, if the tablet is inserted upside down, the inductance value will vary greatly. Therefore, as shown in FIG. 4, it is desirable to form the shape of the tablet in a shape of a truncated cone whose diameter decreases from the upper surface to the lower surface. By doing so, it is possible to prevent an up-down mistake, and it becomes easy to throw in.

本発明のインダクタの製造方法は、インダクタンス値のばらつきが小さいインダクタを効率よく生産することができ、産業上有用である。 INDUSTRIAL APPLICABILITY The method of manufacturing an inductor according to the present invention can efficiently produce inductors with small variations in inductance value, and is industrially useful.

11 リードフレーム
12 コイル素子
13 キャビティ部
14 金型
14a 上金型
14b 下金型
15 ポット
16 樹脂混錬磁性粉
16a 第1の樹脂混錬磁性粉
16b 第2の樹脂混錬磁性粉
17 ランナー部
18 カルランナー
19 プランジャー
11 lead frame 12 coil element 13 cavity part 14 mold 14a upper mold 14b lower mold 15 pot 16 resin-mixed magnetic powder 16a first resin-mixed magnetic powder 16b second resin-mixed magnetic powder 17 runner part 18 Cal runner 19 plunger

Claims (3)

直列状リードフレームのコイル搭載部に搭載したコイル素子と端子部とを接続した後、直列状に配列された複数個のキャビティ部、ランナー部を有する上金型と下金型の間にクランプし、ポット内で加熱した樹脂混錬磁性粉をプランジャーによりカルランナーを介して前記キャビティ部に注入し、熱硬化により固化させ当該コイル素子組立品の封止を行うインダクタの製造方法において、前記カルランナーに近い部分の樹脂混錬磁性粉の磁性粉重量割合を前記カルランナーから遠い部分の前記樹脂混錬磁性粉の磁性粉重量割合よりも小さくしたインダクタの製造方法。 After connecting the coil element mounted on the coil mounting part of the serial lead frame and the terminal part, it is clamped between the upper mold and the lower mold having a plurality of cavity parts and runner parts arranged in series. a method of manufacturing an inductor, in which resin-mixed magnetic powder heated in a pot is injected into the cavity through a cull runner by a plunger, and solidified by heat curing to seal the coil element assembly, A method of manufacturing an inductor, wherein the magnetic powder weight ratio of the resin-mixed magnetic powder in the portion near the runner is smaller than the magnetic powder weight ratio of the resin-mixed magnetic powder in the portion far from the cull runner. 前記樹脂混錬磁性粉はタブレット状の物を用いる請求項1記載のインダクタの製造方法。 2. The method of manufacturing an inductor according to claim 1, wherein the resin-kneaded magnetic powder is in the form of a tablet. 前記樹脂混錬磁性粉は、磁性粉重量割合の異なる複数個のタブレット状の物を用いた請求項2記載のインダクタ製造方法。 3. The method of manufacturing an inductor according to claim 2, wherein said resin kneaded magnetic powder is a plurality of tablets having different weight ratios of magnetic powder.
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