JP2005341359A - Common mode noise filter - Google Patents

Common mode noise filter Download PDF

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JP2005341359A
JP2005341359A JP2004159143A JP2004159143A JP2005341359A JP 2005341359 A JP2005341359 A JP 2005341359A JP 2004159143 A JP2004159143 A JP 2004159143A JP 2004159143 A JP2004159143 A JP 2004159143A JP 2005341359 A JP2005341359 A JP 2005341359A
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conductor
insulating layer
coil
common mode
magnetic
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JP2004159143A
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JP4670262B2 (en
Inventor
Atsushi Shinkai
淳 新海
Hironobu Chiba
博伸 千葉
Shogo Nakayama
祥吾 中山
Hideki Tanaka
秀樹 田中
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Priority to JP2004159143A priority Critical patent/JP4670262B2/en
Priority to TW094116860A priority patent/TW200609956A/en
Priority to EP05743318A priority patent/EP1635363A1/en
Priority to KR1020067001847A priority patent/KR100789040B1/en
Priority to PCT/JP2005/009421 priority patent/WO2005117037A1/en
Priority to US10/562,557 priority patent/US7119649B2/en
Publication of JP2005341359A publication Critical patent/JP2005341359A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a common mode noise filter capable of enlarging impedances of common mode components of first and second coils. <P>SOLUTION: The common mode noise filter includes a first coil 20 comprised of a first conductor 12 and an eddy-like second conductor 14, an eddy-like third conductor 16 provided on the upper surface of a third insulating layer 15 on the upper surface of the second conductor 14, a second coil 21 comprised of the third conductor 16 and a fourth conductor 18, and a fifth insulating layer 19 formed on the upper surface of the fourth conductor 18. A first insulating layer 11 and the fifth insulating layer 19 are comprised of magnetic substances, second to fourth insulating layers 13, 15 and 17 are comprised of non-magnetic substances and in the third insulating layer 15, a plurality of magnetic portions 22 comprised of magnetic materials are provided inside the eddy of the second and third conductors. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、各種電子機器に使用される小型で積層型のコモンモードノイズフィルタに関するものである。   The present invention relates to a small and stacked common mode noise filter used in various electronic devices.

図１０は、従来のコモンモードノイズフィルタの分解斜視図である。   FIG. 10 is an exploded perspective view of a conventional common mode noise filter.

従来のコモンモードノイズフィルタは、図１０に示すように、第１〜第４の絶縁層１ａ〜１ｄの各々の上面にそれぞれ第１〜第４の導体２ａ、２ｂ、３ａ、３ｂを設け、そして第１の導体２ａと渦巻き状の第２の導体２ｂとをバイア電極４ａを介して接続することにより第１のコイル２を形成するとともに、渦巻き状の第３の導体３ａと第４の導体３ｂとをバイア電極４ｂを介して接続することにより第２のコイル３を形成し、さらに第４の導体３ｂの上面に磁性体からなる第５の絶縁層１ｅを設けていた。   As shown in FIG. 10, the conventional common mode noise filter is provided with first to fourth conductors 2a, 2b, 3a, and 3b on the upper surfaces of the first to fourth insulating layers 1a to 1d, and The first coil 2 is formed by connecting the first conductor 2a and the spiral second conductor 2b via the via electrode 4a, and the spiral third conductor 3a and the fourth conductor 3b are formed. Are connected via the via electrode 4b to form the second coil 3, and a fifth insulating layer 1e made of a magnetic material is provided on the upper surface of the fourth conductor 3b.

また、前記第２の絶縁層１ｂ〜第４の絶縁層１ｄは非磁性体で構成するとともに、この非磁性体で構成された第２の絶縁層１ｂ〜第４の絶縁層１ｄに、渦巻き状の第２の導体２ｂおよび第３の導体３ａの渦巻きの内側に位置する磁性部５をそれぞれ１つ設けていた。   The second insulating layer 1b to the fourth insulating layer 1d are made of a non-magnetic material, and the second insulating layer 1b to the fourth insulating layer 1d made of the non-magnetic material are spirally formed. One magnetic part 5 located inside the spiral of each of the second conductor 2b and the third conductor 3a is provided.

なお、磁性部５は第２の絶縁層１ｂ〜第４の絶縁層１ｄにそれぞれ孔を設けた後、ペースト状の磁性材料を充填、熱硬化することにより形成していた。   In addition, the magnetic part 5 was formed by providing holes in the second insulating layer 1b to the fourth insulating layer 1d, and then filling and thermosetting the paste-like magnetic material.

上記のような構成とすることにより、第１のコイル２と第２のコイル３の間を交差する磁界を強めて、第１のコイル２と第２のコイル３のコモンモード成分のインピーダンスを大きくし、これにより、コモンモードノイズを除去するようにしていた。   By configuring as described above, the magnetic field intersecting between the first coil 2 and the second coil 3 is strengthened, and the impedance of the common mode component of the first coil 2 and the second coil 3 is increased. Thus, common mode noise is removed.

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。
特開２００１−７６９３０号公報 For example, Patent Document 1 is known as prior art document information related to the invention of this application.
JP 2001-76930 A

上記した従来のコモンモードノイズフィルタにおいては、磁性部５をそれぞれ１つしか設けていないため、磁性部５を設けるための孔の径を大きくする必要があるが、孔の径を大きくすれば充填時においてペースト状の磁性材料は表面張力の影響を受け易いため、磁性部５の充填量が孔の容積よりも小さくなり、これにより、磁性部５の周辺に空間が生じるため、第１のコイル２と第２のコイル３との間を交差する磁界が弱くなり、この結果、第１のコイル２、第２のコイル３のコモンモード成分のインピーダンスを大きくすることができないという課題を有していた。   In the above-described conventional common mode noise filter, since only one magnetic part 5 is provided, it is necessary to increase the diameter of the hole for providing the magnetic part 5, but if the diameter of the hole is increased, the filling is performed. At this time, since the paste-like magnetic material is easily affected by the surface tension, the filling amount of the magnetic part 5 becomes smaller than the volume of the hole, thereby creating a space around the magnetic part 5. The magnetic field intersecting between the second coil 3 and the second coil 3 is weakened. As a result, the impedance of the common mode component of the first coil 2 and the second coil 3 cannot be increased. It was.

本発明は上記従来の課題を解決するもので、コモンモード成分のインピーダンスを大きくすることができるコモンモードノイズフィルタを提供することを目的とするものである。   The present invention solves the above-described conventional problems, and an object thereof is to provide a common mode noise filter capable of increasing the impedance of a common mode component.

上記目的を達成するために本発明は、第１の絶縁層および第５の絶縁層を磁性体で構成し、かつ第２〜第４の絶縁層を非磁性体で構成するとともに、第３の絶縁層において第２の導体および第３の導体の渦巻きの内側に磁性材料からなる磁性部を複数設けたもので、磁性部を設けるための孔の径が小さくて済むため、充填時においてペースト状の磁性材料は表面張力の影響を受けにくくなり、これにより、磁性部の充填量が孔の容積とほぼ同じになるため、磁性部の周辺に空間はほとんど生じず、この結果、第１のコイルと第２のコイルとの間を交差する磁界が強くなり、第１のコイル、第２のコイルのコモンモード成分のインピーダンスを大きくすることができる。また、空間がほとんど生じないため、クラックの防止も図ることができるという作用効果が得られるものである。   To achieve the above object, according to the present invention, the first insulating layer and the fifth insulating layer are made of a magnetic material, and the second to fourth insulating layers are made of a non-magnetic material. In the insulating layer, a plurality of magnetic parts made of a magnetic material are provided inside the spirals of the second conductor and the third conductor, and the diameter of the hole for providing the magnetic part can be small, so that it is pasty when filling. The magnetic material is less susceptible to the influence of surface tension, so that the filling amount of the magnetic part is almost the same as the volume of the hole, so that there is almost no space around the magnetic part. As a result, the first coil The magnetic field crossing between the first coil and the second coil becomes stronger, and the impedance of the common mode component of the first coil and the second coil can be increased. Further, since almost no space is generated, the effect of preventing cracks can be obtained.

以上のように本発明のコモンモードノイズフィルタは、第１の絶縁層の上面に設けられた第１の導体と、前記第１の導体の上面に設けられた第２の絶縁層と、前記第２の絶縁層の上面に設けられかつ前記第１の導体に接続されてこの第１の導体とにより第１のコイルを構成する渦巻き状の第２の導体と、前記第２の導体の上面に設けられた第３の絶縁層と、前記第３の絶縁層の上面に設けられた渦巻き状の第３の導体と、前記第３の導体の上面に設けられた第４の絶縁層と、前記第４の絶縁層の上面に設けられかつ前記第３の導体に接続されてこの第３の導体とにより第２のコイルを構成する第４の導体と、前記第４の導体の上面に設けられた第５の絶縁層とを備え、前記第１の絶縁層および第５の絶縁層を磁性体で構成し、かつ前記第２〜第４の絶縁層を非磁性体で構成するとともに、前記第３の絶縁層において前記第２の導体および第３の導体の渦巻きの内側に磁性材料からなる磁性部を複数設けているため、磁性部を設けるための孔の径が小さくて済み、これにより、充填時においてペースト状の磁性材料は表面張力の影響を受けにくくなるため、磁性部の充填量が孔の容積とほぼ同じになり、磁性部の周辺に空間はほとんど生じず、この結果、第１のコイルと第２のコイルとの間を交差する磁界が強くなるため、第１のコイル、第２のコイルのコモンモード成分のインピーダンスを大きくすることができるという効果を奏するものである。   As described above, the common mode noise filter of the present invention includes the first conductor provided on the upper surface of the first insulating layer, the second insulating layer provided on the upper surface of the first conductor, and the first conductor. A spiral second conductor provided on the upper surface of the two insulating layers and connected to the first conductor to form a first coil with the first conductor; and an upper surface of the second conductor. A third insulating layer provided; a spiral third conductor provided on the top surface of the third insulating layer; a fourth insulating layer provided on the top surface of the third conductor; A fourth conductor provided on an upper surface of the fourth insulating layer and connected to the third conductor to form a second coil by the third conductor; and provided on an upper surface of the fourth conductor. A fifth insulating layer, the first insulating layer and the fifth insulating layer are made of a magnetic material, and the second to second insulating layers 4 is made of a non-magnetic material, and a plurality of magnetic parts made of a magnetic material are provided inside the spiral of the second conductor and the third conductor in the third insulating layer. Since the diameter of the hole for providing the gap is small and the paste-like magnetic material is less susceptible to the surface tension during filling, the filling amount of the magnetic part is almost the same as the volume of the hole, and the magnetic As a result, the magnetic field intersecting between the first coil and the second coil becomes stronger, so that the impedance of the common mode component of the first coil and the second coil is reduced. There is an effect that it can be enlarged.

（実施の形態１）
以下、実施の形態１を用いて、本発明の特に請求項１に記載の発明について説明する。 (Embodiment 1)
Hereinafter, the first aspect of the present invention will be described with reference to the first embodiment.

図１は本発明の実施の形態１におけるコモンモードノイズフィルタの分解斜視図、図２は同コモンモードノイズフィルタの斜視図である。   FIG. 1 is an exploded perspective view of a common mode noise filter according to Embodiment 1 of the present invention, and FIG. 2 is a perspective view of the common mode noise filter.

本発明の実施の形態１におけるコモンモードノイズフィルタは、図１に示すように、第１の絶縁層１１の上面に設けられた第１の導体１２と、前記第１の導体１２の上面に設けられた第２の絶縁層１３と、前記第２の絶縁層１３の上面に設けられかつ前記第１の導体１２に接続された渦巻き状の第２の導体１４と、前記第２の導体１４の上面に設けられた第３の絶縁層１５と、前記第３の絶縁層１５の上面に設けられた渦巻き状の第３の導体１６と、前記第３の導体１６の上面に設けられた第４の絶縁層１７と、前記第４の絶縁層１７の上面に設けられかつ前記第３の導体１６に接続された第４の導体１８と、前記第４の導体１８の上面に設けられた第５の絶縁層１９とを備えている。   As shown in FIG. 1, the common mode noise filter according to the first exemplary embodiment of the present invention is provided with a first conductor 12 provided on the upper surface of the first insulating layer 11 and an upper surface of the first conductor 12. Of the formed second insulating layer 13, a spiral second conductor 14 provided on the upper surface of the second insulating layer 13 and connected to the first conductor 12, and the second conductor 14 A third insulating layer 15 provided on the upper surface, a spiral third conductor 16 provided on the upper surface of the third insulating layer 15, and a fourth provided on the upper surface of the third conductor 16. An insulating layer 17, a fourth conductor 18 provided on the upper surface of the fourth insulating layer 17 and connected to the third conductor 16, and a fifth conductor 18 provided on the upper surface of the fourth conductor 18. The insulating layer 19 is provided.

そして、前記第１の導体１２とこの第１の導体１２に接続された第２の導体１４とにより第１のコイル２０が構成され、かつ第３の導体１６とこの第３の導体１６に接続された第４の導体１８とにより第２のコイル２１が構成されている。   A first coil 20 is constituted by the first conductor 12 and the second conductor 14 connected to the first conductor 12, and is connected to the third conductor 16 and the third conductor 16. The second coil 21 is configured by the fourth conductor 18 thus formed.

また、前記第１の絶縁層１１、第５の絶縁層１９は磁性体で構成し、かつ第２の絶縁層１３、第３の絶縁層１５、第４の絶縁層１７は非磁性体で構成している。   The first insulating layer 11 and the fifth insulating layer 19 are made of a magnetic material, and the second insulating layer 13, the third insulating layer 15 and the fourth insulating layer 17 are made of a non-magnetic material. doing.

そしてまた、前記第３の絶縁層１５において第２の導体１４および第３の導体１６の渦巻きの内側に磁性材料からなる磁性部２２を複数設けている。   In the third insulating layer 15, a plurality of magnetic portions 22 made of a magnetic material are provided inside the spirals of the second conductor 14 and the third conductor 16.

上記構成において、前記第１の絶縁層１１は、Ｆｅ2Ｏ3をベースとしたフェライト等の磁性材料によりシート状に構成されているもので、絶縁性を有している。 In the above structure, the first insulating layer 11 is one that is configured into a sheet of a magnetic material such as ferrite which is based on Fe 2 O 3, and has an insulating property.

前記第１の導体１２は、銀等の導電材料をめっきすることにより形成されるもので、第１の絶縁層１１の上面に設けられている。また、この第１の導体１２の一端部には、第１の絶縁層１１の側部に露出する第１の引出電極２３が接続されている。   The first conductor 12 is formed by plating a conductive material such as silver, and is provided on the upper surface of the first insulating layer 11. A first lead electrode 23 exposed at the side of the first insulating layer 11 is connected to one end of the first conductor 12.

前記第２の絶縁層１３は、Ｃｕ−Ｚｎフェライト、ガラスセラミック等の非磁性材料によりシート状に構成されているもので、絶縁性を有し、かつ第１の導体１２の上面に設けられている。また、この第２の絶縁層１３の中央部には第１のバイア電極２４が形成されている。なお、この第１のバイア電極２４は、第１の導体１２の他端部１２ａと接続されている。   The second insulating layer 13 is formed in a sheet shape from a non-magnetic material such as Cu—Zn ferrite or glass ceramic, has an insulating property, and is provided on the upper surface of the first conductor 12. Yes. A first via electrode 24 is formed at the center of the second insulating layer 13. The first via electrode 24 is connected to the other end portion 12 a of the first conductor 12.

前記第２の導体１４は、渦巻き状に銀等の導電材料をめっきすることにより形成されるもので、第２の絶縁層１３の上面に設けられている。また、この第２の導体１４の一端部には、第２の絶縁層１３の側部に露出する第２の引出電極２５が接続されている。そしてまた、この第２の導体１４の他端部１４ａ、すなわち渦巻きの中心部は第１のバイア電極２４と接続され、これにより、第１のバイア電極２４を介して第１の導体１２の他端部１２ａと第２の導体１４の他端部１４ａとが電気的に接続されるため、第１の導体１２と第２の導体１４は接続されることになり、これにより、第１の導体１２と第２の導体１４とからなる第１のコイル２０が形成される。   The second conductor 14 is formed by plating a conductive material such as silver in a spiral shape, and is provided on the upper surface of the second insulating layer 13. A second lead electrode 25 exposed at the side of the second insulating layer 13 is connected to one end of the second conductor 14. Further, the other end portion 14 a of the second conductor 14, that is, the central portion of the spiral is connected to the first via electrode 24, whereby the other of the first conductor 12 is connected via the first via electrode 24. Since the end portion 12a and the other end portion 14a of the second conductor 14 are electrically connected, the first conductor 12 and the second conductor 14 are connected, whereby the first conductor A first coil 20 composed of 12 and the second conductor 14 is formed.

前記第３の絶縁層１５は、Ｃｕ−Ｚｎフェライト、ガラスセラミック等の非磁性材料によりシート状に構成されているもので、絶縁性を有し、かつ第２の導体１４の上面に設けられている。   The third insulating layer 15 is formed in a sheet shape from a nonmagnetic material such as Cu—Zn ferrite or glass ceramic, has an insulating property, and is provided on the upper surface of the second conductor 14. Yes.

また、前記第３の絶縁層１５を介して上下方向に隣り合う第２の導体１４と第３の導体１６は、互いに磁気的な影響を及ぼし合うため、第１のコイル２０と第２のコイル２１との間で磁気結合することになり、これにより、第１のコイル２０、第２のコイル２１のコモンモード成分のインピーダンスを大きくすることができる。   In addition, the second conductor 14 and the third conductor 16 that are adjacent in the vertical direction via the third insulating layer 15 exert a magnetic influence on each other, so the first coil 20 and the second coil Thus, the impedance of the common mode component of the first coil 20 and the second coil 21 can be increased.

そしてまた、この第３の絶縁層１５において、その中央部には第２の導体１４および第３の導体１６の渦巻きの内側に位置するように磁性材料からなる磁性部２２が４つ設けられている。そして、この磁性部２２は、第３の絶縁層１５を貫通する孔にＦｅ2Ｏ3をベースとしたフェライト等の磁性材料を充填することにより形成している。また、この磁性部２２は渦巻き状の第２の導体１４および第３の導体１６における最も内側にある導体よりも内側に形成され、かつ第２の導体１４および第３の導体１６とは接触しないように設けられている。 Further, in the third insulating layer 15, four magnetic portions 22 made of a magnetic material are provided in the central portion so as to be located inside the spirals of the second conductor 14 and the third conductor 16. Yes. The magnetic portion 22 is formed by filling a hole penetrating the third insulating layer 15 with a magnetic material such as ferrite based on Fe 2 O 3 . The magnetic portion 22 is formed on the inner side of the innermost conductor of the spiral second conductor 14 and the third conductor 16, and does not contact the second conductor 14 and the third conductor 16. It is provided as follows.

なお、磁性部２２は、複数であれば必ずしも４つ設ける必要はないし、第３の絶縁層１５を貫通させる必要もない。また、磁性部２２の材料として、磁性材料からなる第１の絶縁層１１等と同じ材料を用いれば、コスト面で有利である。さらに、同一の絶縁層には、異なる材料からなる磁性部２２とバイア電極２４、２７の両方を設けないようにすれば、容易に磁性部２２あるいはバイア電極２４、２７を形成することができる。   If there are a plurality of magnetic portions 22, it is not always necessary to provide four, and it is not necessary to penetrate the third insulating layer 15. Further, if the same material as the first insulating layer 11 made of a magnetic material is used as the material of the magnetic portion 22, it is advantageous in terms of cost. Further, if both the magnetic part 22 and the via electrodes 24 and 27 made of different materials are not provided in the same insulating layer, the magnetic part 22 or the via electrodes 24 and 27 can be easily formed.

前記第３の導体１６は、渦巻き状に銀等の導電材料をめっきすることにより形成されるもので、第３の絶縁層１５の上面に設けられている。また、この第３の導体１６の一端部には、第３の絶縁層１５の側部に露出する第３の引出電極２６が接続されている。そしてまた、この第３の導体１６は、その大部分が第２の導体１４と第３の絶縁層１５を介して上面視にて重なるように対向している。   The third conductor 16 is formed by plating a conductive material such as silver in a spiral shape, and is provided on the upper surface of the third insulating layer 15. In addition, a third lead electrode 26 exposed at a side portion of the third insulating layer 15 is connected to one end portion of the third conductor 16. Further, the third conductor 16 is opposed so that most of the third conductor 16 overlaps with the second conductor 14 through the third insulating layer 15 in a top view.

前記第４の絶縁層１７は、Ｃｕ−Ｚｎフェライト、ガラスセラミック等の非磁性材料によりシート状に構成されているもので、絶縁性を有し、かつ第３の導体１６の上面に設けられている。また、この第４の絶縁層１７の中央部には第２のバイア電極２７が形成されている。なお、この第２のバイア電極２７は、第３の導体１６の他端部１６ａすなわち渦巻きの中心部と接続されている。   The fourth insulating layer 17 is formed in a sheet shape from a nonmagnetic material such as Cu—Zn ferrite or glass ceramic, has an insulating property, and is provided on the upper surface of the third conductor 16. Yes. A second via electrode 27 is formed at the center of the fourth insulating layer 17. The second via electrode 27 is connected to the other end 16a of the third conductor 16, that is, the center of the spiral.

また、前記第３の絶縁層１５の厚みは、第２の絶縁層１３および第４の絶縁層１７の厚みより厚くなっている。   The third insulating layer 15 is thicker than the second insulating layer 13 and the fourth insulating layer 17.

前記第４の導体１８は、銀等の導電材料をめっきすることにより形成されるもので、第４の絶縁層１７の上面に設けられている。また、この第４の導体１８の一端部には、第４の絶縁層１７の側部に露出する第４の引出電極２８が接続されている。そしてまた、この第４の導体１８の他端部１８ａ、すなわち渦巻きの中心部は第２のバイア電極２７と接続されているもので、これにより、第２のバイア電極２７を介して第３の導体１６の他端部１６ａと第４の導体１８の他端部１８ａとが電気的に接続されるため、第３の導体１６と第４の導体１８は接続されることになり、これにより、第３の導体１６と第４の導体１８とからなる第２のコイル２１が形成される。なお、前記第２の導体１４、第３の導体１６を渦巻き状にすることによって、第１のコイル２０、第２のコイル２１のインピーダンスを大きくすることができる。また、第１のバイア電極２４および第２のバイア電極２７は、それぞれ第２の絶縁層１３を貫通する孔および第４の絶縁層１７を貫通する孔に銀等の導電体を充填することにより構成している。   The fourth conductor 18 is formed by plating a conductive material such as silver, and is provided on the upper surface of the fourth insulating layer 17. In addition, a fourth lead electrode 28 exposed at a side portion of the fourth insulating layer 17 is connected to one end portion of the fourth conductor 18. Further, the other end portion 18a of the fourth conductor 18, that is, the central portion of the spiral is connected to the second via electrode 27, so that the third via the second via electrode 27 Since the other end 16a of the conductor 16 and the other end 18a of the fourth conductor 18 are electrically connected, the third conductor 16 and the fourth conductor 18 are connected. A second coil 21 composed of the third conductor 16 and the fourth conductor 18 is formed. The impedance of the first coil 20 and the second coil 21 can be increased by making the second conductor 14 and the third conductor 16 spiral. The first via electrode 24 and the second via electrode 27 are formed by filling a hole penetrating the second insulating layer 13 and a hole penetrating the fourth insulating layer 17 with a conductor such as silver, respectively. It is composed.

前記第５の絶縁層１９は、Ｆｅ2Ｏ3をベースとしたフェライト等の磁性材料によりシート状に構成されているもので、絶縁性を有し、かつ第４の導体１８の上面に設けられている。 The fifth insulating layer 19 is formed in a sheet shape from a magnetic material such as ferrite based on Fe 2 O 3 , has an insulating property, and is provided on the upper surface of the fourth conductor 18. ing.

ここで、前記第２の絶縁層１３、第３の絶縁層１５、第４の絶縁層１７において、非磁性材料としてフェライト系のものを使用すると、第１の絶縁層１１、第５の絶縁層１９とともにフェライト同士となるため、各絶縁層を同時に焼成しても、各絶縁層の接合性が良くなり、安定した製品ができる。   Here, when the second insulating layer 13, the third insulating layer 15, and the fourth insulating layer 17 are made of a ferrite-based material as the nonmagnetic material, the first insulating layer 11 and the fifth insulating layer are used. Since it becomes ferrite together with 19, even if each insulating layer is fired simultaneously, the bondability of each insulating layer is improved and a stable product can be obtained.

なお、前記第１の絶縁層１１の下面と第５の絶縁層１９の上面にはダミー絶縁層２９が設けられているもので、このダミー絶縁層２９は、シート状に構成され、絶縁性を有しているが、その材料は磁性材料、非磁性材料のどちらで構成しても構わない。また、第１〜第５の絶縁層１１、１３、１５、１７、１９、ダミー絶縁層２９の枚数は、図１に示された枚数に限られるものではない。   A dummy insulating layer 29 is provided on the lower surface of the first insulating layer 11 and the upper surface of the fifth insulating layer 19, and the dummy insulating layer 29 is formed in a sheet shape and has an insulating property. However, the material may be either a magnetic material or a non-magnetic material. Further, the number of the first to fifth insulating layers 11, 13, 15, 17, 19, and the dummy insulating layer 29 is not limited to the number shown in FIG.

そして、上記した構成により、ノイズフィルタ本体部３０が形成される。また、このノイズフィルタ本体部３０の両側面には、第１〜第４の外部電極３１、３２、３３、３４が設けられ、そしてこの第１〜第４の外部電極３１、３２、３３、３４はそれぞれ前記第１〜第４の引出電極２３、２５、２６、２８と接続されている。   And the noise filter main-body part 30 is formed by the above-mentioned structure. The first to fourth external electrodes 31, 32, 33, 34 are provided on both side surfaces of the noise filter main body 30, and the first to fourth external electrodes 31, 32, 33, 34 are provided. Are connected to the first to fourth extraction electrodes 23, 25, 26, 28, respectively.

上記したように、上下方向に隣り合い互いに磁気的な影響を及ぼし合う第２の導体１４と第３の導体１６は渦巻き状にしているため、互いに磁気的に影響を及ぼす導体の長さは長くなり、さらに、磁性を有する第１の絶縁層１１、第５の絶縁層１９の磁界を効果的に活用でき、この結果、第１のコイル２０と第２のコイル２１のコモンモード成分のインピーダンスが大きくなるものである。   As described above, since the second conductor 14 and the third conductor 16 that are adjacent to each other in the vertical direction and have a magnetic influence on each other are spiral, the length of the conductor that has a magnetic influence on each other is long. Furthermore, the magnetic fields of the first insulating layer 11 and the fifth insulating layer 19 having magnetism can be effectively used. As a result, the impedance of the common mode component of the first coil 20 and the second coil 21 can be reduced. It will be bigger.

なお、前記第１の導体１２、第４の導体１８の形状は、コモンモードノイズ成分のインピーダンスが小さくならなければ、特に限定されるものではないが、図１に示すような形状にすれば、第１の導体１２、第４の導体１８のディファレンシャル成分のインピーダンスが低くなり、その分だけコモンモード成分のインピーダンスを大きくすることができる。   The shapes of the first conductor 12 and the fourth conductor 18 are not particularly limited as long as the impedance of the common mode noise component is not reduced. However, if the shape is as shown in FIG. The impedance of the differential component of the first conductor 12 and the fourth conductor 18 is lowered, and the impedance of the common mode component can be increased accordingly.

また、第１〜第４の引出電極２３、２５、２６、２８も銀等の導電材料をめっきすることにより形成するが、この場合、第１〜第４の引出電極２３、２５、２６、２８は、第１〜第４の導体１２、１４、１６、１８と同時に同じ材料で形成するのが好ましい。なお、第１〜第４の導体１２、１４、１６、１８および第１〜第４の引出電極２３、２５、２６、２８は、めっきで形成するのではなく、その他の印刷や蒸着等の方法で形成してもよい。   The first to fourth extraction electrodes 23, 25, 26, and 28 are also formed by plating a conductive material such as silver. In this case, the first to fourth extraction electrodes 23, 25, 26, and 28 are formed. Is preferably made of the same material as the first to fourth conductors 12, 14, 16, 18 simultaneously. The first to fourth conductors 12, 14, 16, 18 and the first to fourth lead electrodes 23, 25, 26, 28 are not formed by plating, but other methods such as printing and vapor deposition. May be formed.

次に、本発明の実施の形態１におけるコモンモードノイズフィルタの製造方法について説明する。   Next, a method for manufacturing the common mode noise filter in the first embodiment of the present invention will be described.

図１、図２において、まず、それぞれの原材料である磁性材料や非磁性材料の粉体および樹脂からなる混合物により、方形の第１〜第５の絶縁層１１、１３、１５、１７、１９、ダミー絶縁層２９をそれぞれ所定枚数作製する。このとき、第２の絶縁層１３、第４の絶縁層１７の所定箇所に、レーザ、パンチング等で孔あけ加工をし、この孔に銀を充填して、第１、第２のバイア電極２４、２７を形成する。さらに、第３の絶縁層１５の中央部に孔を複数設け、その孔にペースト状の磁性材料を充填し、磁性部２２を複数形成する。   In FIG. 1 and FIG. 2, first, rectangular first to fifth insulating layers 11, 13, 15, 17, 19, 19 are made of a mixture of powders and resins of magnetic materials and nonmagnetic materials as raw materials. A predetermined number of dummy insulating layers 29 are formed. At this time, holes are formed in predetermined portions of the second insulating layer 13 and the fourth insulating layer 17 by laser, punching, or the like, and the holes are filled with silver, whereby the first and second via electrodes 24 are filled. , 27 are formed. Further, a plurality of holes are provided in the central portion of the third insulating layer 15, and the holes are filled with a paste-like magnetic material to form a plurality of magnetic portions 22.

次に、所定枚数のダミー絶縁層２９の上面に、第１の絶縁層１１を配置する。   Next, the first insulating layer 11 is disposed on the upper surface of the predetermined number of dummy insulating layers 29.

次に、第１の絶縁層１１の上面に、第１の導体１２および第１の引出電極２３を、めっきによって形成する。   Next, the first conductor 12 and the first extraction electrode 23 are formed on the upper surface of the first insulating layer 11 by plating.

次に、第１の導体１２の上面に、第１のバイア電極２４が設けられた第２の絶縁層１３を配置する。このとき、第１の導体１２の他端部１２ａと第１のバイア電極２４とを接続する。   Next, the second insulating layer 13 provided with the first via electrode 24 is disposed on the upper surface of the first conductor 12. At this time, the other end portion 12a of the first conductor 12 and the first via electrode 24 are connected.

次に、第２の絶縁層１３の上面に、渦巻き状の第２の導体１４および第２の引出電極２５をめっきによって形成する。このとき、第２の導体１４の他端部１４ａと第１のバイア電極２４とを接続する。   Next, the spiral second conductor 14 and the second extraction electrode 25 are formed on the upper surface of the second insulating layer 13 by plating. At this time, the other end portion 14a of the second conductor 14 and the first via electrode 24 are connected.

次に、第２の導体１４の上面に、磁性部２２が形成された第３の絶縁層１５を配置する。   Next, the third insulating layer 15 in which the magnetic part 22 is formed is disposed on the upper surface of the second conductor 14.

次に、第３の絶縁層１５の上面に、渦巻き状の第３の導体１６および第３の引出電極２６をめっきによって形成する。このとき、第２の導体１４、第３の導体１６は、最も内側にある導体よりも内側に磁性部２２が位置するように設ける。   Next, the spiral third conductor 16 and the third extraction electrode 26 are formed on the upper surface of the third insulating layer 15 by plating. At this time, the second conductor 14 and the third conductor 16 are provided so that the magnetic part 22 is located inside the innermost conductor.

次に、第３の導体１６の上面に、第２のバイア電極２７が設けられた第４の絶縁層１７を配置する。このとき、第３の導体１６の他端部１６ａと第２のバイア電極２７とを接続する。   Next, the fourth insulating layer 17 provided with the second via electrode 27 is disposed on the upper surface of the third conductor 16. At this time, the other end 16a of the third conductor 16 and the second via electrode 27 are connected.

次に、第４の絶縁層１７の上面に、第４の導体１８および第４の引出電極２８を、めっきによって形成する。このとき、第４の導体１８の他端部１８ａと第２のバイア電極２７とを接続する。   Next, the fourth conductor 18 and the fourth extraction electrode 28 are formed on the upper surface of the fourth insulating layer 17 by plating. At this time, the other end 18a of the fourth conductor 18 and the second via electrode 27 are connected.

なお、第１の導体１２、第２の導体１４、第３の導体１６、第４の導体１８の形成方法は、別途用意したベース板（図示せず）に所定パターン形状の導体をめっきによって形成し、その後、この導体を各絶縁層に転写することにより形成する。   In addition, the formation method of the 1st conductor 12, the 2nd conductor 14, the 3rd conductor 16, and the 4th conductor 18 forms the conductor of a predetermined pattern shape by plating on the base plate (not shown) prepared separately. Then, the conductor is formed by transferring it to each insulating layer.

次に、第４の導体１８の上面に、第５の絶縁層１９を配置し、その後、第５の絶縁層１９の上面に所定枚数のダミー絶縁層２９を配置して、ノイズフィルタ本体部３０を形成する。   Next, the fifth insulating layer 19 is disposed on the upper surface of the fourth conductor 18, and then a predetermined number of dummy insulating layers 29 are disposed on the upper surface of the fifth insulating layer 19, and the noise filter main body 30. Form.

なお、上記製造工程において、製造上の効率を向上させるために、各絶縁層に第１の導体１２、第２の導体１４、第３の導体１６、第４の導体１８をそれぞれ複数設けた後、各個片に切断するようにして、同時に複数のノイズフィルタ本体部３０を得るようにしてもよい。   In the above manufacturing process, after providing a plurality of first conductors 12, second conductors 14, third conductors 16, and fourth conductors 18 in each insulating layer in order to improve manufacturing efficiency. A plurality of noise filter main body portions 30 may be obtained at the same time by cutting into individual pieces.

次に、ノイズフィルタ本体部３０を所定の温度、時間で焼成する。   Next, the noise filter main body 30 is fired at a predetermined temperature and time.

次に、ノイズフィルタ本体部３０の両側面に、第１〜第４の引出電極２３、２５、２６、２８とそれぞれ接続されるように銀を印刷することにより、第１〜第４の外部電極３１、３２、３３、３４を形成する。   Next, the first to fourth external electrodes are printed on both side surfaces of the noise filter main body 30 by printing silver so as to be connected to the first to fourth extraction electrodes 23, 25, 26, and 28, respectively. 31, 32, 33 and 34 are formed.

最後に、第１〜第４の外部電極３１、３２、３３、３４の表面にめっきによってニッケルめっき層を形成するとともに、さらにこのニッケルめっき層の表面にめっきによってすずやはんだ等の低融点金属めっき層を形成する。   Finally, a nickel plating layer is formed on the surfaces of the first to fourth external electrodes 31, 32, 33, and 34 by plating, and a low melting point metal plating layer such as tin or solder is further formed on the surface of the nickel plating layer by plating. Form.

上記した本発明の実施の形態１においては、第１の絶縁層１１の上面に設けられた第１の導体１２と、前記第１の導体１２の上面に設けられた第２の絶縁層１３と、前記第２の絶縁層１３の上面に設けられかつ前記第１の導体１２に接続されてこの第１の導体１２とにより第１のコイル２０を構成する渦巻き状の第２の導体１４と、前記第２の導体１４の上面に設けられた第３の絶縁層１５と、前記第３の絶縁層１５の上面に設けられた渦巻き状の第３の導体１６と、前記第３の導体１６の上面に設けられた第４の絶縁層１７と、前記第４の絶縁層１７の上面に設けられかつ前記第３の導体１６に接続されてこの第３の導体１６とにより第２のコイル２１を構成する第４の導体１８と、前記第４の導体１８の上面に設けられた第５の絶縁層１９と、前記第１〜第４の導体１２、１４、１６、１８の各々の一端部にそれぞれ接続された第１〜第４の引出電極２３、２５、２６、２８とを備え、前記第１の絶縁層１１および第５の絶縁層１９を磁性体で構成し、かつ前記第２〜第４の絶縁層１３、１５、１７を非磁性体で構成するとともに、前記第３の絶縁層１５において前記第２の導体１４および第３の導体１６の渦巻きの内側に磁性材料からなる磁性部２２を複数設けているため、磁性部２２を設けるための孔の径が小さくて済み、これにより、充填時においてペースト状の磁性材料は表面張力の影響を受けにくくなるため、磁性部２２の充填量が孔の容積とほぼ同じになり、磁性部２２の周辺に空間はほとんど生じず、この結果、第１のコイル２０と第２のコイル２１との間を交差する磁界が強くなるため、第１のコイル２０と第２のコイル２１との間を交差する磁界が強くなるため、第１のコイル２０、第２のコイル２１のコモンモード成分のインピーダンスを大きくすることができる。また、空間がほとんど生じないため、クラックの防止も図ることができる。   In the first embodiment of the present invention described above, the first conductor 12 provided on the upper surface of the first insulating layer 11, the second insulating layer 13 provided on the upper surface of the first conductor 12, and A spiral second conductor 14 provided on the upper surface of the second insulating layer 13 and connected to the first conductor 12 to form the first coil 20 with the first conductor 12; A third insulating layer 15 provided on the upper surface of the second conductor 14, a spiral third conductor 16 provided on the upper surface of the third insulating layer 15, and the third conductor 16 The second coil 21 is formed by the fourth insulating layer 17 provided on the upper surface and the third conductor 16 provided on the upper surface of the fourth insulating layer 17 and connected to the third conductor 16. A fourth conductor 18 to be configured, and a fifth insulating layer 1 provided on the upper surface of the fourth conductor 18 And first to fourth extraction electrodes 23, 25, 26, 28 respectively connected to one ends of the first to fourth conductors 12, 14, 16, 18, The insulating layer 11 and the fifth insulating layer 19 are made of a magnetic material, and the second to fourth insulating layers 13, 15, and 17 are made of a non-magnetic material. Since a plurality of magnetic portions 22 made of a magnetic material are provided inside the spirals of the second conductor 14 and the third conductor 16, the diameter of the hole for providing the magnetic portion 22 can be small, and thus when filling, In this case, since the paste-like magnetic material is not easily affected by the surface tension, the filling amount of the magnetic part 22 is almost the same as the volume of the hole, and there is almost no space around the magnetic part 22. Between the second coil 21 and the second coil 21 Since the magnetic field to be applied becomes stronger, the magnetic field intersecting between the first coil 20 and the second coil 21 becomes stronger, so that the impedance of the common mode component of the first coil 20 and the second coil 21 is increased. be able to. Further, since almost no space is generated, cracks can be prevented.

さらに、第１のコイル２０、第２のコイル２１を構成しかつ磁界が発生する第１〜第４の導体１２、１４、１６、１８は非磁性体に設けているため、磁束の漏れを少なくすることができ、これにより、第１のコイル２０と第２のコイル２１との間の磁気結合が強まるため、第１のコイル２０、第２のコイル２１のコモンモード成分のインピーダンスをさらに大きくすることができる。   Furthermore, since the first to fourth conductors 12, 14, 16, and 18 that constitute the first coil 20 and the second coil 21 and generate a magnetic field are provided in a non-magnetic material, leakage of magnetic flux is reduced. As a result, the magnetic coupling between the first coil 20 and the second coil 21 is strengthened, so that the impedance of the common mode component of the first coil 20 and the second coil 21 is further increased. be able to.

そして、第１のコイル２０と第２のコイル２１との間、すなわち磁気結合する第２の導体１４と第３の導体１６との間に位置する第３の絶縁層１５に磁性材料を設けることができ、これにより、第１のコイル２０と第２のコイル２１の間を交差する磁界を強めることができるため、第１のコイル２０、第２のコイル２１のコモンモード成分のインピーダンスを大きくすることができる。   A magnetic material is provided on the third insulating layer 15 located between the first coil 20 and the second coil 21, that is, between the second conductor 14 and the third conductor 16 that are magnetically coupled. As a result, the magnetic field intersecting between the first coil 20 and the second coil 21 can be strengthened, so that the impedance of the common mode component of the first coil 20 and the second coil 21 is increased. be able to.

このとき、図３に示すように、第２の導体１４の他端部１４ａ、第３の導体１６の他端部１６ａすなわち渦巻きの中心部を、複数の磁性部２２に囲まれた部分に位置させるようにしてもよく、この場合は、第２の導体１４および第３の導体１６の渦巻きの中心部を延長することができるため、延長された導体の長さの分だけ、互いに磁気的に影響を及ぼす導体の長さを長くすることができ、これにより、コモンモード成分のインピーダンスをさらに大きくすることができる。   At this time, as shown in FIG. 3, the other end portion 14 a of the second conductor 14 and the other end portion 16 a of the third conductor 16, that is, the center portion of the spiral are positioned in a portion surrounded by a plurality of magnetic portions 22. In this case, since the central portions of the spirals of the second conductor 14 and the third conductor 16 can be extended, they can be magnetically connected to each other by the length of the extended conductor. The length of the influencing conductor can be increased, thereby further increasing the impedance of the common mode component.

また、磁性部２２は、第２の導体１４、第３の導体１６の渦巻きの内側のみに設けたが、図４に示すように、磁性部２２を第２の導体１４、第３の導体１６の渦巻きの外側にも設けるようにしてもよい。このとき、磁性部２２は、渦巻き状の第２の導体１４、第３の導体１６の最も外側にある導体よりも外側、すなわち第３の絶縁層１５の周囲部に設けるようにする。これにより、第１のコイル２０、第２のコイル２１の内側だけでなく、外側においても第１のコイル２０と第２のコイル２１の間を交差する磁界を強めることができるため、コモンモード成分のインピーダンスをさらに大きくすることができる。なお、図４において、磁性部２２は第３の絶縁層１５の周囲の４辺に、第３の絶縁層１５から露出するようにそれぞれ設けているが、必ずしも４辺すべてに設ける必要はなく、また第３の絶縁層１５から露出させる必要もない。さらに、第２の導体１４、第３の導体１６を囲むように連続して設けるようにしてもよい。   Further, although the magnetic part 22 is provided only inside the spirals of the second conductor 14 and the third conductor 16, the magnetic part 22 is provided with the second conductor 14 and the third conductor 16 as shown in FIG. It may also be provided outside the spirals. At this time, the magnetic portion 22 is provided outside the outermost conductors of the spiral second conductor 14 and the third conductor 16, that is, at the periphery of the third insulating layer 15. Thereby, since the magnetic field which cross | intersects between the 1st coil 20 and the 2nd coil 21 can be strengthened not only inside the 1st coil 20 and the 2nd coil 21, but the outside, it is common mode component. The impedance can be further increased. In FIG. 4, the magnetic portions 22 are provided on the four sides around the third insulating layer 15 so as to be exposed from the third insulating layer 15, but are not necessarily provided on all four sides. Further, it is not necessary to expose the third insulating layer 15. Further, the second conductor 14 and the third conductor 16 may be provided continuously so as to surround them.

そしてまた、磁性部２２は、第２の導体１４、第３の導体１６と接触しないように設けたが、図５に示すように、磁性部２２を第２の導体１４、第３の導体１６の一部と上面視にて接触するように設けてもよく、この場合は、磁性部２２の大きさを大きくできるため、コモンモード成分のインピーダンスをさらに大きくすることができる。   In addition, the magnetic part 22 is provided so as not to contact the second conductor 14 and the third conductor 16, but as shown in FIG. 5, the magnetic part 22 is provided with the second conductor 14 and the third conductor 16. In this case, since the size of the magnetic part 22 can be increased, the impedance of the common mode component can be further increased.

ここで、図３〜図５は、説明を簡単にするために、第３の絶縁層１５、第３の導体１６、磁性部２２のみを示す。   Here, FIGS. 3 to 5 show only the third insulating layer 15, the third conductor 16, and the magnetic part 22 in order to simplify the description.

また、前記磁性部２２は第３の絶縁層１５のみに設けたが、図６に示すように、磁性部２２を第４の絶縁層１７にも設けるようにしてもよい。このとき、第３の絶縁層１５に設けられた磁性部２２と連続してもよいし、連続しなくてもよく、この場合は、第１のコイル２０と第２のコイル２１の間を交差する磁界をさらに強めることができるため、コモンモード成分のインピーダンスをさらに大きくすることができる。なお、図６においては、磁性部２２を第４の絶縁層１７に設けるようになっているが、第２の絶縁層１３に設けてもよく、あるいは第２の絶縁層１３、第４の絶縁層１７の両方に設けてもよい。   Further, although the magnetic part 22 is provided only in the third insulating layer 15, the magnetic part 22 may be provided also in the fourth insulating layer 17 as shown in FIG. 6. At this time, the magnetic part 22 provided on the third insulating layer 15 may or may not be continuous. In this case, the first coil 20 and the second coil 21 are crossed. Since the magnetic field to be applied can be further increased, the impedance of the common mode component can be further increased. In FIG. 6, the magnetic part 22 is provided in the fourth insulating layer 17, but it may be provided in the second insulating layer 13, or the second insulating layer 13 and the fourth insulating layer 13. It may be provided on both layers 17.

（実施の形態２）
以下、実施の形態２を用いて、本発明の特に請求項２〜４に記載の発明について説明する。 (Embodiment 2)
Hereinafter, the invention described in the second to fourth aspects of the present invention will be described using the second embodiment.

図７は本発明の実施の形態２におけるコモンモードノイズフィルタの分解斜視図である。なお、上記した本発明の実施の形態１の構成と同様の構成を有するものについては、同一符号を付しその説明を省略する。   FIG. 7 is an exploded perspective view of the common mode noise filter according to Embodiment 2 of the present invention. In addition, about what has the structure similar to the structure of Embodiment 1 of the above-mentioned this invention, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

図７において、上記した本発明の実施の形態１と相違する点は、第４の引出電極２８を、第１の引出電極２３が設けられた第１の絶縁層１１の同一面に設けるようにした点である。なお、図７においては、第４の引出電極２８は第２の絶縁層１３に隠れているため、図示されていない。   In FIG. 7, the difference from the first embodiment of the present invention described above is that the fourth extraction electrode 28 is provided on the same surface of the first insulating layer 11 provided with the first extraction electrode 23. This is the point. In FIG. 7, the fourth extraction electrode 28 is not shown because it is hidden behind the second insulating layer 13.

この場合は、第２のバイア電極２７を、第２の絶縁層１３および第３の絶縁層１５に設け、かつ第４の導体１８および第４の引出電極２８を第１の絶縁層１１の上面に設けて、第３の導体１６の他端部１６ａと第４の導体１８とを接続する必要がある。また、第１の引出電極２３は、第４の引出電極２８が設けられた第４の絶縁層１７の同一面に設けるようにしてもよく、このようにした場合は、第１の引出電極２３、第４の引出電極２８が同一面内に設けられることになるため、第１の引出電極２３、第４の引出電極２８同士でも磁気結合させることができ、これにより、第１のコイル２０と第２のコイル２１との間の磁気結合が強まるため、コモンモード成分のインピーダンスをさらに大きくすることができる。   In this case, the second via electrode 27 is provided on the second insulating layer 13 and the third insulating layer 15, and the fourth conductor 18 and the fourth lead electrode 28 are provided on the upper surface of the first insulating layer 11. It is necessary to connect the other end portion 16 a of the third conductor 16 and the fourth conductor 18. In addition, the first extraction electrode 23 may be provided on the same surface of the fourth insulating layer 17 provided with the fourth extraction electrode 28. In this case, the first extraction electrode 23 is provided. Since the fourth extraction electrode 28 is provided in the same plane, the first extraction electrode 23 and the fourth extraction electrode 28 can be magnetically coupled to each other. Since the magnetic coupling with the second coil 21 is strengthened, the impedance of the common mode component can be further increased.

また、第１〜第４の引出電極２３、２５、２６、２８のそれぞれの幅は、第１〜第４の導体１２、１４、１６、１８のそれぞれの幅より広くしてもよく、このようにした場合は、第１のコイル２０と第２のコイル２１との磁気結合に関係しない第１〜第４の導体１２、１４、１６、１８の磁気的な影響を低減することができるため、磁気結合する部分のほとんどを互いに磁気的な影響を及ぼし合う第２の導体１４と第３の導体１６とにすることができ、これにより、コモンモード成分のインピーダンスをさらに大きくすることができる。   The widths of the first to fourth extraction electrodes 23, 25, 26, and 28 may be wider than the widths of the first to fourth conductors 12, 14, 16, and 18, respectively. In this case, since it is possible to reduce the magnetic influence of the first to fourth conductors 12, 14, 16, 18 that are not related to the magnetic coupling between the first coil 20 and the second coil 21, Most of the portions to be magnetically coupled can be the second conductor 14 and the third conductor 16 that have a magnetic influence on each other, whereby the impedance of the common mode component can be further increased.

そしてまた、第１の導体１２および第４の導体１８のそれぞれの幅は、第２の導体１４および第３の導体１６のそれぞれの幅より広くしてもよく、このようにした場合は、第１の導体１２および第４の導体１８で発生するディファレンシャルモード成分のインピーダンスを小さくできるため、その分だけ第１のコイル２０、第２のコイル２１のコモンモード成分のインピーダンスをさらに大きくすることができる。   Further, the widths of the first conductor 12 and the fourth conductor 18 may be wider than the widths of the second conductor 14 and the third conductor 16, respectively. Since the impedance of the differential mode component generated in the first conductor 12 and the fourth conductor 18 can be reduced, the impedance of the common mode component of the first coil 20 and the second coil 21 can be further increased accordingly. .

（実施の形態３）
以下、実施の形態３を用いて、本発明の特に請求項５、６に記載の発明について説明する。 (Embodiment 3)
Hereinafter, the invention described in claims 5 and 6 of the present invention will be described using the third embodiment.

図８は本発明の実施の形態３におけるコモンモードノイズフィルタの分解斜視図である。なお、上記した本発明の実施の形態１の構成と同様の構成を有するものについては、同一符号を付しその説明を省略する。   FIG. 8 is an exploded perspective view of the common mode noise filter according to Embodiment 3 of the present invention. In addition, about what has the structure similar to the structure of Embodiment 1 of the above-mentioned this invention, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

図８において、上記した本発明の実施の形態１と相違する点は、第２の絶縁層１３、第４の絶縁層１７の厚みを２０μｍ以下とした点である。   In FIG. 8, the difference from the above-described first embodiment of the present invention is that the thickness of the second insulating layer 13 and the fourth insulating layer 17 is 20 μm or less.

このようにした場合、第１の絶縁層１１と第２の導体１４との距離および第５の絶縁層１９と第３の導体１６との距離をそれぞれ短くでき、これにより、磁性体で構成された第１の絶縁層１１および第５の絶縁層１９で発生する磁界を有効に活用できるため、第１のコイル２０、第２のコイル２１のコモンモード成分のインピーダンスを大きくすることができる。このとき、磁性部２２は複数でも、あるいは１個でもよい。   In this case, the distance between the first insulating layer 11 and the second conductor 14 and the distance between the fifth insulating layer 19 and the third conductor 16 can be shortened, respectively, so that the magnetic material is used. In addition, since the magnetic fields generated in the first insulating layer 11 and the fifth insulating layer 19 can be used effectively, the impedance of the common mode component of the first coil 20 and the second coil 21 can be increased. At this time, the magnetic part 22 may be plural or one.

図９は、本発明の実施の形態３におけるコモンモードノイズフィルタにおいて、第２の絶縁層１３および第４の絶縁層１７の厚みと、第１のコイル２０、第２のコイル２１の結合係数との関係を示す図である。   FIG. 9 shows the thicknesses of the second insulating layer 13 and the fourth insulating layer 17 and the coupling coefficients of the first coil 20 and the second coil 21 in the common mode noise filter according to the third embodiment of the present invention. It is a figure which shows the relationship.

このとき、試料として、第３の絶縁層１５の厚みを２６μｍとした図１に示す構造を備えたコモンモードノイズフィルタを作製した。そして、その結合係数が０．９６以下のものを不良とした。なお、この結合係数が大きいほど、第１のコイル２０、第２のコイル２１のコモンモード成分のインピーダンスを大きくすることができる。   At this time, a common mode noise filter having the structure shown in FIG. 1 in which the thickness of the third insulating layer 15 was 26 μm was produced as a sample. Those having a coupling coefficient of 0.96 or less were regarded as defective. In addition, the impedance of the common mode component of the 1st coil 20 and the 2nd coil 21 can be enlarged, so that this coupling coefficient is large.

図９から明らかなように、第２の絶縁層１３および第４の絶縁層１７の厚みは２０μｍ以下にする必要があることがわかる。２０μｍより厚いと磁性を有する第１の絶縁層１１、第５の絶縁層１９の磁界を効果的に活用できないからである。なお、第２の絶縁層１３および第４の絶縁層１７の厚みが２０μｍ以下のときは、第３の絶縁層１５の厚みを厚くしても結合係数は高いまま、かつほとんど変動はなかった。   As can be seen from FIG. 9, the thickness of the second insulating layer 13 and the fourth insulating layer 17 needs to be 20 μm or less. This is because if the thickness is greater than 20 μm, the magnetic fields of the first insulating layer 11 and the fifth insulating layer 19 having magnetism cannot be effectively used. When the thickness of the second insulating layer 13 and the fourth insulating layer 17 was 20 μm or less, the coupling coefficient remained high and hardly changed even when the thickness of the third insulating layer 15 was increased.

また、第２の絶縁層１３および第４の絶縁層１７の厚みの下限値は、要求される特性に応じて適宜決めればよいが、取り扱い易さを考慮して例えば５μｍ以上とするのが好ましい。   Further, the lower limit value of the thickness of the second insulating layer 13 and the fourth insulating layer 17 may be appropriately determined according to the required characteristics, but is preferably set to 5 μm or more in consideration of ease of handling. .

さらに、第３の絶縁層１５の厚みは、第２の絶縁層１３および第４の絶縁層１７の厚みより厚くしているもので、これにより、第３の絶縁層１５を介して設けられた第２の導体１４と第３の導体１６との間、すなわち第１のコイル２０と第２のコイル２１との間で絶縁不良やマイグレーション等が発生するのを防止することができ、かつ第２の絶縁層１３、第４の絶縁層１７の厚みを薄くできるため、第１の絶縁層１１と第２の導体１４との距離、第５の絶縁層１９と第３の導体１６との距離をそれぞれ短くすることができ、これにより、第５の絶縁層１９が磁性体で構成されている場合、磁性体で構成された第１の絶縁層１１、第５の絶縁層１９で発生する磁界を有効に活用できるため、第１のコイル２０、第２のコイル２１のコモンモード成分のインピーダンスを大きくすることができる。   Further, the thickness of the third insulating layer 15 is larger than the thickness of the second insulating layer 13 and the fourth insulating layer 17, so that the third insulating layer 15 is provided via the third insulating layer 15. It is possible to prevent the occurrence of poor insulation or migration between the second conductor 14 and the third conductor 16, that is, between the first coil 20 and the second coil 21, and the second Therefore, the distance between the first insulating layer 11 and the second conductor 14 and the distance between the fifth insulating layer 19 and the third conductor 16 can be reduced. Accordingly, when the fifth insulating layer 19 is made of a magnetic material, the magnetic fields generated in the first insulating layer 11 and the fifth insulating layer 19 made of a magnetic material can be reduced. Since it can be used effectively, the common mode of the first coil 20 and the second coil 21 is reduced. It is possible to increase the impedance of the components.

なお、上記本発明の実施の形態１〜３におけるコモンモードノイズフィルタにおいては、第１のコイル２０、第２のコイル２１をそれぞれ１つ設けたが、第１のコイル２０、第２のコイル２１をそれぞれ複数設けたアレイタイプとしてもよい。   In the common mode noise filter according to the first to third embodiments of the present invention, one first coil 20 and one second coil 21 are provided. However, the first coil 20 and the second coil 21 are provided. It is good also as an array type which provided multiple each.

本発明に係るコモンモードノイズフィルタは、第１のコイル、第２のコイルのコモンモード成分のインピーダンスを大きくすることができ、携帯電話、情報機器等のノイズ対策として使用されるノイズフィルタ等として有用である。   The common mode noise filter according to the present invention can increase the impedance of the common mode component of the first coil and the second coil, and is useful as a noise filter used as a noise countermeasure for mobile phones, information devices, etc. It is.

本発明の実施の形態１におけるコモンモードノイズフィルタの分解斜視図1 is an exploded perspective view of a common mode noise filter according to Embodiment 1 of the present invention. 同コモンモードノイズフィルタの斜視図Perspective view of the common mode noise filter 同コモンモードノイズフィルタの他の例を示す主要部の斜視図Perspective view of main part showing another example of the common mode noise filter 同コモンモードノイズフィルタの他の例を示す主要部の斜視図Perspective view of main part showing another example of the common mode noise filter 同コモンモードノイズフィルタの他の例を示す主要部の斜視図Perspective view of main part showing another example of the common mode noise filter 同コモンモードノイズフィルタの他の例を示す分解斜視図An exploded perspective view showing another example of the common mode noise filter 本発明の実施の形態２におけるコモンモードノイズフィルタの分解斜視図The disassembled perspective view of the common mode noise filter in Embodiment 2 of this invention 本発明の実施の形態３におけるコモンモードノイズフィルタの分解斜視図The disassembled perspective view of the common mode noise filter in Embodiment 3 of this invention 同コモンモードノイズフィルタにおいて、第２の絶縁層および第４の絶縁層の厚みと、第１のコイル、第２のコイルの結合係数との関係を示す図The figure which shows the relationship between the thickness of a 2nd insulating layer and a 4th insulating layer, and the coupling coefficient of a 1st coil and a 2nd coil in the common mode noise filter 従来のコモンモードノイズフィルタの分解斜視図Exploded perspective view of a conventional common mode noise filter

符号の説明Explanation of symbols

１１ 第１の絶縁層
１２ 第１の導体
１３ 第２の絶縁層
１４ 第２の導体
１５ 第３の絶縁層
１６ 第３の導体
１７ 第４の絶縁層
１８ 第４の導体
１９ 第５の絶縁層
２０ 第１のコイル
２１ 第２のコイル
２２ 磁性部
２３ 第１の引出電極
２５ 第２の引出電極
２６ 第３の引出電極
２８ 第４の引出電極 DESCRIPTION OF SYMBOLS 11 1st insulating layer 12 1st conductor 13 2nd insulating layer 14 2nd conductor 15 3rd insulating layer 16 3rd conductor 17 4th insulating layer 18 4th conductor 19 5th insulating layer 20 1st coil 21 2nd coil 22 Magnetic part 23 1st extraction electrode 25 2nd extraction electrode 26 3rd extraction electrode 28 4th extraction electrode

Claims (6)

第１の絶縁層の上面に設けられた第１の導体と、前記第１の導体の上面に設けられた第２の絶縁層と、前記第２の絶縁層の上面に設けられかつ前記第１の導体に接続されてこの第１の導体とにより第１のコイルを構成する渦巻き状の第２の導体と、前記第２の導体の上面に設けられた第３の絶縁層と、前記第３の絶縁層の上面に設けられた渦巻き状の第３の導体と、前記第３の導体の上面に設けられた第４の絶縁層と、前記第４の絶縁層の上面に設けられかつ前記第３の導体に接続されてこの第３の導体とにより第２のコイルを構成する第４の導体と、前記第４の導体の上面に設けられた第５の絶縁層と、前記第１〜第４の導体の各々の一端部にそれぞれ接続された第１〜第４の引出電極とを備え、前記第１の絶縁層および第５の絶縁層を磁性体で構成し、かつ前記第２〜第４の絶縁層を非磁性体で構成するとともに、前記第３の絶縁層において前記第２の導体および第３の導体の渦巻きの内側に磁性材料からなる磁性部を複数設けたコモンモードノイズフィルタ。 A first conductor provided on an upper surface of the first insulating layer; a second insulating layer provided on an upper surface of the first conductor; and an upper surface of the second insulating layer and the first conductor A spiral second conductor that is connected to the first conductor to form a first coil with the first conductor, a third insulating layer provided on an upper surface of the second conductor, and the third conductor A spiral third conductor provided on the upper surface of the insulating layer; a fourth insulating layer provided on the upper surface of the third conductor; and an upper surface of the fourth insulating layer and A fourth conductor which is connected to the third conductor and constitutes a second coil with the third conductor, a fifth insulating layer provided on the upper surface of the fourth conductor, and the first to first First to fourth lead electrodes respectively connected to one end of each of the four conductors, and the first insulating layer and the fifth insulating layer are magnetically connected to each other. And the second to fourth insulating layers are made of a non-magnetic material, and the third insulating layer is made of a magnetic material inside the spirals of the second conductor and the third conductor. Common mode noise filter with multiple magnetic parts. 第１の引出電極および第４の引出電極を、第１の絶縁層または第４の絶縁層の同一面に設けるようにした請求項１記載のコモンモードノイズフィルタ。 The common mode noise filter according to claim 1, wherein the first extraction electrode and the fourth extraction electrode are provided on the same surface of the first insulating layer or the fourth insulating layer. 第１〜第４の引出電極のそれぞれの幅を、第１〜第４の導体のそれぞれの幅より広くした請求項１記載のコモンモードノイズフィルタ。 The common mode noise filter according to claim 1, wherein each of the first to fourth extraction electrodes has a width wider than each of the first to fourth conductors. 第１の導体および第４の導体のそれぞれの幅を、第２の導体および第３の導体のそれぞれの幅より広くした請求項１記載のコモンモードノイズフィルタ。 The common mode noise filter according to claim 1, wherein the width of each of the first conductor and the fourth conductor is wider than the width of each of the second conductor and the third conductor. 第１の絶縁層の上面に設けられた第１の導体と、前記第１の導体の上面に設けられた第２の絶縁層と、前記第２の絶縁層の上面に設けられかつ前記第１の導体に接続されてこの第１の導体とにより第１のコイルを構成する渦巻き状の第２の導体と、前記第２の導体の上面に設けられた第３の絶縁層と、前記第３の絶縁層の上面に設けられた渦巻き状の第３の導体と、前記第３の導体の上面に設けられた第４の絶縁層と、前記第４の絶縁層の上面に設けられかつ前記第３の導体に接続されてこの第３の導体とにより第２のコイルを構成する第４の導体と、前記第４の導体の上面に設けられた第５の絶縁層と、前記第１〜第４の導体の各々の一端部にそれぞれ接続された第１〜第４の引出電極とを備え、前記第１の絶縁層および第５の絶縁層を磁性体で構成し、かつ前記第２〜第４の絶縁層を非磁性体で構成するとともに、前記第３の絶縁層において前記第２の導体および第３の導体の渦巻きの内側に磁性材料からなる磁性部を設け、前記第２、第４の絶縁層の厚みを２０μｍ以下としたコモンモードノイズフィルタ。 A first conductor provided on an upper surface of the first insulating layer; a second insulating layer provided on an upper surface of the first conductor; and an upper surface of the second insulating layer and the first conductor A spiral second conductor that is connected to the first conductor to form a first coil with the first conductor, a third insulating layer provided on an upper surface of the second conductor, and the third conductor A spiral third conductor provided on the upper surface of the insulating layer; a fourth insulating layer provided on the upper surface of the third conductor; and an upper surface of the fourth insulating layer and A fourth conductor which is connected to the third conductor and constitutes a second coil with the third conductor, a fifth insulating layer provided on the upper surface of the fourth conductor, and the first to first First to fourth lead electrodes respectively connected to one end of each of the four conductors, and the first insulating layer and the fifth insulating layer are magnetically connected to each other. And the second to fourth insulating layers are made of a non-magnetic material, and the third insulating layer is made of a magnetic material inside the spirals of the second conductor and the third conductor. A common mode noise filter provided with a magnetic part, wherein the thickness of the second and fourth insulating layers is 20 μm or less. 第３の絶縁層の厚みを、第２の絶縁層および第４の絶縁層の厚みより厚くした請求項５記載のコモンモードノイズフィルタ。 The common mode noise filter according to claim 5, wherein the third insulating layer is thicker than the second insulating layer and the fourth insulating layer.
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PCT/JP2005/009421 WO2005117037A1 (en) 2004-05-28 2005-05-24 Common mode noise filter
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