JP6524409B2 - Common mode noise filter and method of manufacturing the same - Google Patents

Common mode noise filter and method of manufacturing the same Download PDF

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JP6524409B2
JP6524409B2 JP2014231836A JP2014231836A JP6524409B2 JP 6524409 B2 JP6524409 B2 JP 6524409B2 JP 2014231836 A JP2014231836 A JP 2014231836A JP 2014231836 A JP2014231836 A JP 2014231836A JP 6524409 B2 JP6524409 B2 JP 6524409B2
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common mode
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mode noise
noise filter
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JP2016096259A (en
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託司 川嶋
託司 川嶋
亮平 原田
亮平 原田
賢一 松島
賢一 松島
吉田 則隆
則隆 吉田
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Panasonic Intellectual Property Management Co Ltd
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Description

本発明は、デジタル機器やAV機器、情報通信端末等の各種電子機器に使用される小形で薄型のコモンモードノイズフィルタ及びその製造方法に関するものである。   The present invention relates to a small and thin common mode noise filter used in various electronic devices such as digital devices, AV devices, and information communication terminals, and a method of manufacturing the same.

従来のこの種のコモンモードノイズフィルタは、図6に示すように、第1の積層部1と、第1の積層部1上に設けられ2つのコイル2が内蔵された非磁性体部3と、非磁性体部3上に設けられた第2の積層部4とを備え、非磁性体部3のコイル2の巻軸部に磁性体部5を形成していた。   As shown in FIG. 6, the conventional common mode noise filter of this type includes a first laminated portion 1 and a nonmagnetic portion 3 provided on the first laminated portion 1 and in which two coils 2 are incorporated. The second laminated portion 4 provided on the nonmagnetic portion 3 is provided, and the magnetic portion 5 is formed on the winding shaft portion of the coil 2 of the nonmagnetic portion 3.

また、このコモンモードノイズフィルタは、図7に示すように、第1の積層部1上に2つのコイル2が内蔵された非磁性体部3を積層した後、2つのコイル2の巻軸部にレーザを照射して凹部6を形成していた。そして、この凹部6に磁性材料を充填して磁性体部5を形成し、その後、非磁性体部3に第2の積層部2を積層してから焼成し、さらに、外部電極を形成するようにしていた。   Further, as shown in FIG. 7, in this common mode noise filter, after laminating the nonmagnetic portion 3 in which the two coils 2 are built in on the first laminated portion 1, the winding shaft portions of the two coils 2 are The concave portion 6 is formed by irradiating the Then, a magnetic material is filled in the concave portion 6 to form the magnetic portion 5, and thereafter, the second laminated portion 2 is laminated on the nonmagnetic portion 3 and fired, and further, an external electrode is formed. I was on my mind.

このコモンモードノイズフィルタでは、2つのコイル2を交差する磁界を磁性体部5で強め、コモンモード成分のインピーダンスを大きくして、コモンモードノイズを除去するようにしていた。   In this common mode noise filter, the magnetic field crossing the two coils 2 is strengthened by the magnetic portion 5, and the impedance of the common mode component is increased to remove the common mode noise.

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

特開2006−229105号公報Unexamined-Japanese-Patent No. 2006-229105

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、レーザを照射して形成された凹部6は、テーパー状になるため、非磁性体部3の下側部分の直径が小さくなる。   In the above-described conventional common mode noise filter, since the concave portion 6 formed by irradiating the laser is tapered, the diameter of the lower portion of the nonmagnetic portion 3 is reduced.

また、レーザの強度を上げれば、凹部6の非磁性体部3の下側部分の直径を大きくすることはできるが、第1の積層部1を貫通してしまう恐れがある。このため、レーザの強度を下げざるを得ず、この結果、非磁性体部3の下側部分の直径を大きくすることができないため、磁性体部5を通る磁束が少なくなり、これにより、2つのコイル2を交差する磁界を強くすることができない。したがって、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ず、コモンモードノイズの除去機能が低下してしまうという課題を有していた。   In addition, if the laser intensity is increased, the diameter of the lower portion of the nonmagnetic portion 3 of the recess 6 can be increased, but there is a possibility that the first laminated portion 1 may be penetrated. For this reason, the intensity of the laser must be reduced, and as a result, the diameter of the lower portion of the nonmagnetic portion 3 can not be increased, so that the magnetic flux passing through the magnetic portion 5 decreases. The magnetic field crossing the two coils 2 can not be intensified. Therefore, the impedance of the common mode component can not be increased, and the function of removing the common mode noise is degraded.

本発明は上記従来の課題を解決するもので、コモンモードノイズの除去機能を向上させ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-mentioned conventional problems, and an object of the present invention is to provide a common mode noise filter that can improve the function of removing common mode noise.

上記目的を解決するために本発明は、第1の積層部と、前記第1の積層部上に設けられ2つのコイルを有する非磁性体部と、前記非磁性体部上に設けられた第2の積層部とを備え、前記非磁性体部の前記コイルの巻軸部に、下方になるにつれて徐々に面積が小さくなる磁性体部を形成し、前記第1の積層部の厚みを前記第2の積層部の厚みより厚くし、前記第1の積層部と前記磁性体部を同じ磁性材料で構成した構成を有する。 In order to solve the above object, the present invention provides a first laminated portion, a nonmagnetic portion provided on the first laminated portion and having two coils, and a second portion provided on the nonmagnetic portion. Forming a magnetic body portion having a gradually decreasing area toward the lower side on the winding shaft portion of the coil of the nonmagnetic body portion, and forming a thickness of the first lamination portion The first laminated portion and the magnetic portion are made of the same magnetic material and have a thickness greater than the thickness of the laminated portion 2.

本発明のコモンモードノイズフィルタは、第1の積層部の厚みが厚いことから、レーザの強度を上げても第1の積層部を貫通してしまう可能性が小さくなるため、磁性体部の非磁性体部の下側部分の直径を大きくすることができ、これにより、コイルを交差する磁界を強くすることができるため、コモンモードノイズの除去機能を向上させることができるという効果を奏するものである。   In the common mode noise filter of the present invention, since the thickness of the first laminated portion is thick, the possibility of penetrating the first laminated portion is reduced even if the laser intensity is increased. The diameter of the lower portion of the magnetic portion can be increased, and thereby the magnetic field crossing the coils can be strengthened, so that the function of removing common mode noise can be improved. is there.

また、磁性体部の面積が大きい側(上面部分)の第2の積層部の厚みを薄くしているが、磁性体部の面積が大きい側から出る磁束の量が多いため、第2の積層部の厚みが薄くても、磁束が2つのコイル全体を回るようにすることができ、逆に磁性体部の面積が小さい側から出る磁束の量は小さいため、磁性体部の面積が小さい側(下面部分)の第1の積層部の厚みを厚くして、磁束が2つのコイル全体を回るようにしている。この結果、コイルの磁気結合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。   In addition, although the thickness of the second stacked portion on the side (upper surface portion) where the area of the magnetic portion is large is reduced, the amount of magnetic flux emitted from the side where the area of the magnetic portion is large is large. Even if the thickness of the portion is small, the magnetic flux can be made to go around the entire two coils, and conversely, the amount of magnetic flux coming out from the side with a small area of the magnetic portion is small. The thickness of the first laminated portion (lower surface portion) is increased so that the magnetic flux travels around the entire two coils. As a result, the magnetic coupling of the coil can be intensified, so that the impedance of the common mode component can be increased.

本発明の一実施の形態におけるコモンモードノイズフィルタの断面図Sectional view of a common mode noise filter according to an embodiment 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 same common mode noise filter 同コモンモードノイズフィルタの製造方法を示す断面図Sectional view showing a method of manufacturing the same common mode noise filter 同コモンモードノイズフィルタの磁性体部のテーパー率とコモンモードインピーダンス変化率との関係を示す図The figure which shows the relationship between the taper rate of the magnetic body part of the common mode noise filter and common mode impedance change rate 同コモンモードノイズフィルタの積層部厚みとコモンモードインピーダンス変化率との関係を示す図The figure which shows the relationship between the lamination | stacking part thickness of the same common mode noise filter, and a common mode impedance change rate 従来のコモンモードノイズフィルタの断面図Cross-sectional view of a conventional common mode noise filter 同コモンモードノイズフィルタの製造方法を示す断面図Sectional view showing a method of manufacturing the same common mode noise filter

図1は本発明の一実施の形態におけるコモンモードノイズフィルタの断面図、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 a sectional view of a common mode noise filter according to an embodiment of the present invention, and FIG. 2 is a perspective view of the common mode noise filter.

本発明の一実施の形態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の積層部11と、前記第1の積層部11上に設けられ2つのコイル12が内蔵された非磁性体部13と、前記非磁性体部13上に設けられた第2の積層部14とを備え、前記非磁性体部13の前記コイル12の巻軸部に、下方になるにつれて徐々に面積が小さくなる磁性体部15を形成し、前記第1の積層部11の厚みを前記第2の積層部14の厚みより厚くしている。   The common mode noise filter according to one embodiment of the present invention is, as shown in FIG. 1, a first laminated portion 11 and a nonmagnetic material provided on the first laminated portion 11 and incorporating two coils 12. A body portion 13 and a second laminated portion 14 provided on the nonmagnetic portion 13 are provided, and the winding shaft portion of the coil 12 of the nonmagnetic portion 13 has an area gradually decreasing toward the lower side. The magnetic portion 15 is formed to be small, and the thickness of the first laminated portion 11 is made larger than the thickness of the second laminated portion 14.

上記構成において、前記第1の積層部11は、シート状に構成されたNi−Cu−Znフェライト等の磁性材料からなる複数の磁性体層で構成されている。   In the above-described configuration, the first laminated portion 11 is formed of a plurality of magnetic layers made of a magnetic material such as Ni-Cu-Zn ferrite which is formed in a sheet shape.

また、前記2つのコイル12は、それぞれ渦巻状のコイル導体で構成され、独立した2つのコイル12同士が磁気結合するようになっている。   The two coils 12 are each formed of a spiral coil conductor, and two independent coils 12 are magnetically coupled to each other.

そして、前記非磁性体部13は、第1の積層部11の上面に積層され、複数の非磁性体層を積層することによって形成され、また、この非磁性体部13は、シート状に構成されたCu−Znフェライト、ガラスセラミック等の非磁性材料からなる非磁性体層で構成されている。   The nonmagnetic portion 13 is stacked on the upper surface of the first stacked portion 11 and formed by stacking a plurality of nonmagnetic layers, and the nonmagnetic portion 13 is formed in a sheet shape. It is comprised by the nonmagnetic material layer which consists of nonmagnetic materials, such as the said Cu-Zn ferrite and glass ceramic.

さらに、非磁性体部13の内部には、2つのコイル12が形成され、また、2つのコイル12を構成するコイル導体は、それぞれ非磁性体層に銀等の導電材料を渦巻状にめっきまたは印刷することにより形成されている。なお、2つのコイル12は、非磁性体部13と第1、第2の積層部11、14との界面に形成してもよい。   Furthermore, two coils 12 are formed inside the nonmagnetic portion 13, and coil conductors constituting the two coils 12 are each plated with a conductive material such as silver in a nonmagnetic layer, It is formed by printing. The two coils 12 may be formed at the interface between the nonmagnetic portion 13 and the first and second stacked portions 11 and 14.

そして、前記第2の積層部14は、非磁性体部13の上面に積層され、シート状に構成されたNi−Cu−Znフェライト等の磁性材料からなる複数の磁性体層で構成されている。また、この第2の積層部14全体の積層方向の厚みは、第1の積層部11全体の積層方向の厚みより薄くなっている。   The second laminated portion 14 is formed of a plurality of magnetic layers made of a magnetic material such as Ni-Cu-Zn ferrite which is laminated on the upper surface of the nonmagnetic portion 13 and is formed in a sheet shape. . Moreover, the thickness in the stacking direction of the entire second stacked portion 14 is thinner than the thickness in the stacking direction of the entire first stacked portion 11.

なお、第1の積層部11の下面にさらに非磁性材料からなる他の非磁性層を形成してもよい。同様に、第2の積層部14の上面にさらに非磁性材料からなる他の非磁性層を形成してもよい。さらに、前記他の非磁性層の代わりに磁性層と他の非磁性層からなる積層物を形成してもよい。また、第1の積層部11または第2の積層部14を一体の磁性物で構成し、非磁性体部13に接着剤を介して接合させるようにしてもよい。   Note that another nonmagnetic layer made of a nonmagnetic material may be further formed on the lower surface of the first stacked portion 11. Similarly, another nonmagnetic layer made of nonmagnetic material may be formed on the upper surface of the second stacked portion 14. Furthermore, instead of the other nonmagnetic layer, a laminate comprising a magnetic layer and another nonmagnetic layer may be formed. Alternatively, the first stacked portion 11 or the second stacked portion 14 may be formed of an integral magnetic material, and may be bonded to the nonmagnetic portion 13 via an adhesive.

さらにまた、前記磁性体部15は、2つのコイル12の巻軸部において、下方になるにつれて徐々に面積が小さくなる(テーパー状になっている)ように非磁性体部13に設けられている。したがって、上面視にて最上部の面積が最下部の面積より大きくなっている。さらに、断面から見て磁性体部15は線対称に形成される。また、磁性体部15は、第1、第2の積層部11、14と同一の磁性材料で形成され、焼成後に、磁性体部15は、第1、第2の積層部11、14と一体化される。   Furthermore, the magnetic body portion 15 is provided in the nonmagnetic body portion 13 so that the area becomes smaller (tapered) gradually toward the lower side in the winding shaft portion of the two coils 12 . Therefore, the area of the top in the top view is larger than the area of the bottom. Furthermore, the magnetic portion 15 is formed in line symmetry when viewed from the cross section. Further, the magnetic portion 15 is formed of the same magnetic material as the first and second laminated portions 11 and 14, and after firing, the magnetic portion 15 is integrated with the first and second laminated portions 11 and 14. Be

そして、上記した構成により、図2に示すようなコモンモードノイズフィルタの本体部16が形成される。また、この本体部16の両端面には、4つの外部電極17が設けられ、そしてこの外部電極17はそれぞれ2つのコイル12の各両端部と接続されている。さらに、外部電極17は、本体部16の端面に銀を印刷することにより形成され、またこれら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、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。   Then, with the above-described configuration, the main body portion 16 of the common mode noise filter as shown in FIG. 2 is formed. Further, four external electrodes 17 are provided on both end surfaces of the main body portion 16, and the external electrodes 17 are connected to both ends of the two coils 12 respectively. Furthermore, the external electrode 17 is formed by printing silver on the end face of the main body portion 16, and while forming a nickel plating layer on these surfaces by plating, plating such as tin or solder on the surface of this nickel plating layer A low melting point metal plating layer is formed.

以下、図3において、本発明の一実施の形態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。   Hereinafter, in FIG. 3, a method of manufacturing the common mode noise filter according to the embodiment of the present invention will be described.

まず、図3(a)に示すように、第1の積層部11の上面に、内部に2つのコイル12が形成された非磁性体部13を積層する。   First, as shown in FIG. 3A, the nonmagnetic portion 13 in which the two coils 12 are formed is stacked on the upper surface of the first stacked portion 11.

次に、図3(b)に示すように、コイル12の最も内側にある部分よりも内側でコイル巻軸中心となる部分に、レーザを照射して、非磁性体部13を貫通し下方になるにつれて徐々に面積が小さくなる(テーパー状になっている)凹部18を形成する。このとき、同時に第1の積層部11の上部の一部分にも凹部18を連続するように形成する。また、凹部18は第1の積層部11の底面まで貫通しないようにする。   Next, as shown in FIG. 3 (b), a laser is irradiated to a portion located inside the innermost portion of the coil 12 and centered on the coil winding axis, penetrating the nonmagnetic portion 13 and downward. As a result, the recess 18 is formed in which the area is gradually reduced (tapered). At this time, the recess 18 is formed continuously to a part of the upper portion of the first stacked portion 11 at the same time. In addition, the recess 18 is prevented from penetrating to the bottom surface of the first stacked portion 11.

次に、図3(c)に示すように、凹部18にNi−Cu−Znフェライト等の磁性材料15aを充填し、非磁性体部13に磁性体部15を形成する。そして、第1の積層部11に形成された凹部18にも磁性材料15aが充填されるので、第1の積層部11に異種材料が形成されることはなく、第1の積層部11全体が最終的に、磁性材料で構成されることになり、さらに、焼成時に一体化される。   Next, as shown in FIG. 3C, the recess 18 is filled with a magnetic material 15 a such as Ni—Cu—Zn ferrite, and the magnetic portion 15 is formed in the nonmagnetic portion 13. And since the magnetic material 15a is also filled in the recess 18 formed in the first laminated portion 11, different materials are not formed in the first laminated portion 11, and the entire first laminated portion 11 is Eventually, it will be composed of a magnetic material and be further integrated at the time of firing.

次に、図3(d)に示すように、非磁性体部13の上面に第2の積層部14を積層して本体部16を構成する。その後、850℃〜950℃の温度で焼成する。   Next, as shown in FIG. 3D, the second laminated portion 14 is laminated on the upper surface of the nonmagnetic portion 13 to form the main body portion 16. Then, it bakes at the temperature of 850 degreeC-950 degreeC.

最後に、図2に示すように、本体部16に2つのコイル12の両端部と接続する外部電極17を形成する。   Finally, as shown in FIG. 2, external electrodes 17 connected to both ends of the two coils 12 are formed in the main body portion 16.

上記したように本発明の一実施の形態におけるコモンモードノイズフィルタにおいては、第1の積層部11の厚みが厚いことから、レーザの強度を上げても第1の積層部11を貫通してしまう可能性が小さくなるため、磁性体部15の非磁性体部13の下側部分の直径を大きくすることができ、これにより、コイル12を交差する磁界を強くすることができるため、コモンモードノイズの除去機能を向上させることができるという効果が得られるものである。   As described above, in the common mode noise filter according to the embodiment of the present invention, the first laminated portion 11 is penetrated even if the laser intensity is increased because the thickness of the first laminated portion 11 is thick. Since the possibility is reduced, the diameter of the lower portion of the nonmagnetic portion 13 of the magnetic portion 15 can be increased, and thereby the magnetic field crossing the coil 12 can be intensified. The effect of being able to improve the removal function of is obtained.

さらに、第2の積層部14の厚みを薄くしているため、製品厚みが厚くなることはない。すなわち、製品の薄型化とコモンモードノイズの除去機能向上を両立することができる。また、第1の積層部11の厚みを厚くした分だけ第2の積層部14の厚みを薄くすれば製品の厚みは変わらない。   Furthermore, since the thickness of the second laminated portion 14 is reduced, the product thickness does not increase. That is, it is possible to achieve both thinning of the product and improvement of the function of removing common mode noise. Further, if the thickness of the second laminated portion 14 is reduced by an amount corresponding to the increase of the thickness of the first laminated portion 11, the thickness of the product does not change.

そして、凹部18の全体を同時に一体的に形成しているため、生産性が低下することもない。   And since the whole of the recessed part 18 is simultaneously formed integrally, productivity does not fall.

図4は、本発明の一実施の形態におけるコモンモードノイズフィルタの磁性体部のテーパー率とコモンモードインピーダンス変化率との関係を示す図である。ここで横軸は、非磁性体部13の上面における磁性体部15の面積に対する、上面視で非磁性体部13の上面における磁性体部15が形成された部分における非磁性体部13の下面での磁性体部15となっていない部分の面積の比率(テーパー率)を表し、縦軸はテーパー率0%(すなわちテーパーが全く付いてない状態)におけるコモンモードインピーダンスに対するコモンモードインピーダンス変化率を表す。   FIG. 4 is a diagram showing the relationship between the taper ratio of the magnetic material portion of the common mode noise filter and the rate of change in common mode impedance according to the embodiment of the present invention. Here, the horizontal axis is the lower surface of the nonmagnetic portion 13 in the portion where the magnetic portion 15 is formed in the upper surface of the nonmagnetic portion 13 with respect to the area of the magnetic portion 15 in the upper surface of the nonmagnetic portion 13 Represents the ratio (taper ratio) of the area of the portion that is not the magnetic body portion 15 in the vertical axis, the vertical axis indicates the common mode impedance change ratio to the common mode impedance at a taper ratio of 0% (that is, no taper attached). Represent.

図4から明らかなように、テーパー率が50%以下の場合、コモンモードインピーダンス変化率を−20%以内に抑えることができ、好ましい。   As apparent from FIG. 4, when the taper rate is 50% or less, the common mode impedance change rate can be suppressed to within -20%, which is preferable.

図5は、本発明の一実施の形態におけるコモンモードノイズフィルタの積層部厚みとコモンモードインピーダンス変化率との関係を示す図である。ここで横軸は上方の第2の積層部14の厚みと下方の第1の積層部11の厚みの比率を表し、縦軸を第2の積層部14の厚みと第1の積層部11の厚みを同じにした場合のコモンモードインピーダンスに対するコモンモードインピーダンス変化率を表す。なお、テーパー率を50%としている。   FIG. 5 is a diagram showing the relationship between the thickness of the laminated portion of the common mode noise filter and the rate of change in common mode impedance according to the embodiment of the present invention. Here, the horizontal axis represents the ratio of the thickness of the upper second stacked portion 14 to the thickness of the lower first stacked portion 11, and the vertical axis represents the thickness of the second stacked portion 14 and the thickness of the first stacked portion 11. It shows the common mode impedance change rate to the common mode impedance when the thickness is made the same. The taper rate is 50%.

図5から明らかなように、上方の第2の積層部14の厚みを、下方の第1の積層部11の厚みより薄くした方が、コモンモードインピーダンスの低下を防ぐことができる。   As apparent from FIG. 5, if the thickness of the upper second stacked portion 14 is thinner than the thickness of the lower first stacked portion 11, the decrease in common mode impedance can be prevented.

すなわち、磁性体部15の非磁性体部13の上面における面積が大きいため、この磁性体部15の面積が大きい側から出る磁束の量が多く、これにより、第2の積層部14の厚みが薄くても、磁束が2つのコイル12全体を回るようにすることができ、逆に磁性体部15の面積が小さい側から出る磁束の量は小さいため、磁性体部15の面積が小さい側(下面部分)の第1の積層部11の厚みを厚くして、磁束が2つのコイル12全体を回るようにしている。この結果、コイル12の磁気結合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大きくすることができる。   That is, since the area of the upper surface of the nonmagnetic portion 13 of the magnetic portion 15 is large, the amount of magnetic flux emitted from the side of the large area of the magnetic portion 15 is large, whereby the thickness of the second stacked portion 14 is Even if it is thin, magnetic flux can be made to go around the whole of the two coils 12, and conversely, the amount of magnetic flux coming out from the side with a small area of the magnetic portion 15 is small. The thickness of the first laminated portion 11 in the lower surface portion is thickened so that the magnetic flux travels around the entire two coils 12. As a result, since the magnetic coupling of the coil 12 can be strengthened, the impedance of the common mode component can be increased.

したがって、第2の積層部14の厚みを第1の積層部11の厚みより薄くすることで、磁性体部15の非磁性体部13の下側部分の直径を大きくすることができ、かつ、コモンモードインピーダンスの低下を防ぐこともできる。   Therefore, by making the thickness of the second stacked portion 14 thinner than the thickness of the first stacked portion 11, the diameter of the lower portion of the nonmagnetic portion 13 of the magnetic portion 15 can be increased, and It is also possible to prevent the decrease in common mode impedance.

本発明に係るコモンモードノイズフィルタおよびその製造方法は、コモンモードノイズの除去機能を向上させることができるという効果を有するものであり、特にデジタル機器やAV機器、情報通信端末等に使用される小形で薄型のコモンモードノイズフィルタ等において有用となるものである。   The common mode noise filter and the method of manufacturing the same according to the present invention have the effect of being able to improve the function of removing common mode noise, and in particular, the small size used in digital devices, AV devices, information communication terminals, etc. Is useful in thin common mode noise filters and the like.

11 第1の積層部
12 コイル
13 非磁性体部
14 第2の積層部
15 磁性体部
11 first stacked portion 12 coil 13 nonmagnetic portion 14 second stacked portion 15 magnetic portion

Claims (3)

第1の積層部と、前記第1の積層部上に設けられ2つのコイルを有する非磁性体部と、前記非磁性体部上に設けられた第2の積層部とを備え、前記非磁性体部の前記コイルの巻軸部に、下方になるにつれて徐々に面積が小さくなる磁性体部を形成し、前記第1の積層部の厚みを前記第2の積層部の厚みより厚くし、前記第1の積層部と前記磁性体部を同じ磁性材料で構成したコモンモードノイズフィルタ。
A non-magnetic material portion provided on the first lamination portion and having two coils, and a second lamination portion provided on the non-magnetic material portion; A magnetic body portion in which the area gradually decreases in the lower direction is formed on the winding shaft portion of the coil of the body portion, the thickness of the first laminated portion is made thicker than the thickness of the second laminated portion , The common mode noise filter which comprised the 1st lamination | stacking part and the said magnetic body part with the same magnetic material .
前記磁性体部のテーパー率を50%以下とした請求項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 a taper rate of the magnetic portion is 50% or less. 請求項1記載のコモンモードノイズフィルタにおいて、レーザ照射によって前記非磁性体部および前記第1の積層部の上部の一部分に同時に凹部を形成した後、前記凹部に磁性材料を充填して前記磁性体部を形成するようにしたコモンモードノイズフィルタの製造方法。 The common mode noise filter according to claim 1, wherein a recess is simultaneously formed in a part of an upper portion of the nonmagnetic material portion and the first laminated portion by laser irradiation, and then the recess is filled with a magnetic material to form the magnetic member. The manufacturing method of the common mode noise filter which formed the part.
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