JP2015012167A - Common mode noise filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a common mode noise filter in which the difference of inductance values of two coils is small, and the common mode impedance is large.SOLUTION: A common mode noise filter includes first through sixth insulation layers 11-16, and first through fourth conductors 21-24. The first and second conductors 21, 22 constitute a reverse direction coil, while the third and fourth conductors 23, 24 constitute a forward direction coil. The first and sixth insulation layers 11, 16 is composed of a magnetic material, and the second through fifth insulation layers 12-15 are composed of a non-magnetic material.

Description

  The present invention relates to a laminated common mode noise filter used in, for example, a differential transmission circuit.

  With the expansion of needs for portable electronic devices and thin electronic devices, common mode noise filters used for differential transmission circuits of these electronic devices are also required to be small and thin. As a small and thin common mode noise filter, Patent Document 1 discloses that two coils forming a common mode noise filter are arranged in a nonmagnetic material layer, and an extraction electrode is formed of the nonmagnetic material layer, the magnetic material layer, and the like. A structure arranged between the two is described.

Japanese Patent Laying-Open No. 2005-340611

  In the structure described in Patent Document 1, in order to increase the common mode impedance, the two extraction electrodes are in contact with the magnetic layer and the distance between the magnetic layer and the coil electrode is reduced. However, one of the lead electrodes is connected in the forward direction to the winding direction of the coil electrode, and the other is connected in the reverse direction. Therefore, the inductance value of the coils connected in the forward direction becomes larger than the inductance value of the coils connected in the reverse direction, and a difference occurs in the transmission characteristics of the two coils. If the difference in transmission characteristics increases, it may lead to problems such as skew deviation. An object of the present invention is to obtain a common mode noise filter having a small difference in inductance value between two coils and a large common mode impedance.

As a result of intensive studies by the present inventors, the present invention having the following characteristics has been completed.
(1) a first insulating layer, 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 the second A spiral second conductor provided on the upper surface of the insulating layer and connected to the first conductor to form the first coil together with the first conductor, and provided on the upper surface of the second conductor A third insulating layer; 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 the upper surface of the insulating layer and connected to the third conductor to form a second coil together with the third conductor; and a fifth conductor provided on the upper surface of the fourth conductor. An insulating layer, a sixth insulating layer provided on the upper surface of the fifth insulating layer, and one end of each of the first to fourth conductors are connected to each other. And the first conductor is connected so that at least a part thereof is directed in the opposite direction with respect to the winding direction of the spiral second conductor. The at least one conductor is connected to the winding direction of the spiral third conductor so that at least a part thereof is directed in the forward direction, the first and sixth insulating layers are made of a magnetic material, and the second The common mode noise filter, wherein the fifth insulating layer is made of a nonmagnetic material, and the first to sixth insulating layers do not contain a resin.
(2) The angle formed between the direction in which the first conductor is directed to the portion connected to the second conductor and the direction in which the second conductor extends from the connected portion is 120 ° or more and smaller than 180 ° (1) Common mode noise filter.
(3) The angle formed between the direction in which the fourth conductor is directed to the portion connected to the third conductor and the direction in which the third conductor extends from the connected portion is greater than 0 ° and not more than 60 °. The common mode noise filter according to (1) or (2).
(4) Any one of (1) to (3), wherein the first and sixth insulating layers are made of Ni—Zn—Cu ferrite, and the third to fifth insulating layers are made of Zn—Cu ferrite. The common mode noise filter described in 1.
(5) In any one of (1) to (3), the first and sixth insulating layers are made of Ni—Zn—Cu ferrite, and the third to fifth insulating layers are made of a dielectric material. Common mode noise filter as described.

  According to the present invention, in the common mode noise filter having a structure in which the extraction electrode and the magnetic layer are in contact, each of the extraction electrodes connected in the forward direction and the reverse direction with respect to the winding direction of the coil electrode in the forward direction. A nonmagnetic layer is inserted between the lead electrode to be connected and the magnetic layer in contact therewith. Therefore, the inductance value of the coil to which the extraction electrode is connected in the forward direction decreases, approaches the inductance value of the coil to which the extraction electrode is connected in the reverse direction, and the difference between the inductance values of the two coils can be reduced. Further, since the distance between the extraction electrode and the coil electrode is increased only in one of the two coils, there is an effect that the common mode impedance does not decrease so much.

It is a component diagram of an embodiment of the present invention. It is a connection diagram of the 1st conductor and the 2nd spiral conductor, and the 3rd spiral conductor and the 4th conductor. It is an external view of an embodiment of the present invention. It is a component diagram of a comparative example It is a component diagram of a comparative example

  Hereinafter, the present invention will be described in detail with appropriate reference to the drawings. However, the present invention is not limited to the illustrated embodiment, and in the drawings, the characteristic portions of the invention may be emphasized and expressed, so that the accuracy of the scale is not necessarily guaranteed in each part of the drawings. Not.

  FIG. 1 is a component diagram of an embodiment of the present invention. According to the present invention, the multilayer structure inside the multilayer common mode noise filter is as follows. First, the lowermost insulating layer on which the conductor is formed is defined as the first insulating layer 11. In the present invention, the concept of “upper and lower” is for the convenience of explanation of the laminated structure, and does not limit the order of the steps at the time of manufacture, nor does it limit the directionality or arrangement at the time of use. A first conductor 21 is provided on the upper surface of the first insulating layer 11. The second insulating layer 12 is provided on the upper surface of the first conductor 21. A second conductor 22 is provided on the upper surface of the second insulating layer 12. The second conductor 22 has a spiral shape and is connected to the first conductor 21. The first and second conductors 21 and 22 constitute a first coil. Here, the first conductor 21 serves as an extraction electrode. A third insulating layer 13 is provided on the upper surface of the second conductor 22. A third conductor 23 is provided on the upper surface of the third insulating layer 13. A fourth insulating layer 14 is provided on the upper surface of the third conductor 23. A fourth conductor 24 is provided on the upper surface of the fourth insulating layer 14. The third conductor 23 has a spiral shape and is connected to the fourth conductor 24. The 3rd and 4th conductors 23 and 24 comprise the 2nd coil, and the 4th conductor 24 has played the role of the extraction electrode here. The first coil and the second coil are electrically separate and independent. A fifth insulating layer 15 is provided on the upper surface of the fourth conductor 24. A sixth insulating layer 16 is provided on the upper surface of the fifth insulating layer 15. First to fourth terminals 31 to 34 are connected to one end portions of the first to fourth conductors 21 to 24, respectively.

  2 is a connection diagram of the first conductor 21 and the second spiral conductor 22 (FIG. 2 (A1)), and a connection diagram of the third spiral conductor 23 and the fourth conductor 24 (FIG. 2 (B1)). It is. As shown in FIG. 2 (A1), the first conductor 21 is connected so that a part thereof is directed in the opposite direction with respect to the winding direction of the second spiral conductor 22. More specifically, it is as follows. The rotation of the spiral exhibited by the second conductor 22 is indicated by the arrow indicated by the symbol R2. A direction in which the second conductor 22 extends from a portion where the first conductor 21 and the second conductor 22 are connected is represented by an arrow indicated by a symbol D2. The direction in which the first conductor 21 is directed toward the connecting portion is represented by an arrow indicated by a symbol D1. Here, regardless of whether or not the first conductor 21 has a straight line shape, the direction from the outside of the spiral formed by the second conductor 22 to the connecting portion is linearly approximated and the direction is denoted by It is expressed by the arrow D1.

  FIG. 2 (A2) is obtained by extracting the arrows indicated by the symbols D1 and D2. As shown in FIG. 2 (A2), the angle φ1 formed by the arrows indicated by the reference signs D1 and D2 is 90 to 180 °. From this, “the first conductor is the winding of the spiral second conductor. It can be evaluated that at least a part is connected in the opposite direction with respect to the direction. From the viewpoint that the adjustment range of the inductance characteristic can be increased, the angle φ1 formed by the arrows indicated by the above-described symbols D1 and D2 should be close to 180 °, preferably larger than 90 °, smaller than 180 °, and more preferably. Is 120 ° or more and smaller than 180 °.

  As shown in FIG. 2 (B1), the fourth conductor 24 is connected to the winding direction of the third spiral conductor 23 so that a part thereof is directed in the forward direction. More specifically, it is as follows. The rotation of the spiral exhibited by the third conductor 23 is indicated by the arrow indicated by the symbol R3. A direction in which the third conductor 23 extends from a portion where the fourth conductor 24 and the third conductor 23 are connected is represented by an arrow indicated by a symbol D3. The direction in which the fourth conductor 24 is directed toward the connecting portion is represented by an arrow indicated by a symbol D4. Here, regardless of whether or not the fourth conductor 24 is in a straight line shape, the direction from the outside of the spiral formed by the third conductor 23 to the connecting portion is linearly approximated and the direction is denoted It is expressed by an arrow D4.

  FIG. 2 (B2) is obtained by extracting arrows indicated by symbols D3 and D4. As shown in FIG. 2 (B2), the angle φ2 formed by the arrows indicated by reference numerals D3 and D4 is 0 to 90 °. From this, “the fourth conductor is a winding of the spiral third conductor. It can be evaluated that at least a part is connected so as to be directed in the forward direction with respect to the direction. From the viewpoint that the adjustment range of the inductance characteristic can be increased, the angle φ2 formed by the arrows indicated by the above-described symbols D3 and D4 is preferably close to 0 °, preferably more than 0 °, less than 90 °, and more preferably Is greater than 0 ° and less than or equal to 60 °.

  Conventional materials can be used as appropriate for the materials and manufacturing methods of the first to fourth conductors 21 to 24, and examples thereof include Ag. Non-limiting examples of the method of manufacturing the conductors 21 to 24 include printing using a paste, and connection of the first and second conductors 21 and 22 and connection of the third and fourth conductors 23 and 24. Can appropriately use through-hole technology. With respect to the creation of the through hole, for example, a technique such as punching with a mold or drilling by laser processing is not limited.

The insulating layer is as follows.
The first insulating layer 11 and the sixth insulating layer 16 are made of a magnetic material, and the second to fifth insulating layers 12 to 15 are made of a nonmagnetic material. Here, the magnetic material is a ferromagnetic material, and the non-magnetic material is other than a ferromagnetic material. None of the first to sixth insulating layers 11 to 16 contains a resin. In FIG. 1, the insulating layer made of a magnetic material is drawn in white, and the insulating layer made of a non-magnetic material is drawn in black.

  Examples of the magnetic material include, but are not limited to, Ni—Zn—Cu ferrite. Examples of the non-magnetic material include, but are not limited to, Zn ferrite. In addition, Zn—Cu ferrite is suitable as the low-magnetic sintered nonmagnetic material. The nonmagnetic material may be made of a dielectric material such as borosilicate glass or a mixture of borosilicate glass and crystalline silica.

  The configuration in the region sandwiched between the first insulating layer 11 and the sixth insulating layer 16 is as described above, but the other configurations in the laminated common mode noise filter are not particularly limited. For example, dummy insulating layers 17A to 17C may be provided on the lower surface of the first insulating layer 11, or dummy insulating layers 18A to 18B may be provided on the upper surface of the sixth insulating layer 16, in which case These dummy insulating layers may be magnetic or non-magnetic.

  FIG. 3 is an external view of an embodiment of the present invention. According to the present invention, the outer shape of the laminated common mode noise filter 1 is not particularly limited, and a rectangular parallelepiped shape as illustrated is exemplified. You may have the laminated body chip | tip 10 which consists of a laminated structure mentioned above, and the external electrode 30 formed in the side surface of this laminated body chip | tip 10. FIG. The external electrode 30 may be plated. The terminals 31 to 34 described above are appropriately connected to the external electrode 30.

  There is no particular limitation on the manufacturing method of the laminated common mode noise filter, and the conventional technique can be used as appropriate. As a typical example, a magnetic sheet and a non-magnetic sheet that are precursors of each insulating layer are obtained, a conductor paste or the like is printed on the sheet, and a coil is formed by appropriately providing a through hole. And the method of removing the resin (debinding) and baking. Specific examples of these production methods will be described in detail in the following examples.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the embodiments described in these examples.

Example 1
First, in order to obtain a magnetic material sheet, a butyral resin and a solvent were added to Ni—Zn—Cu ferrite fine powder after calcining and pulverization mainly containing FeO ₂ , CuO, ZnO, and NiO to prepare slurry. This slurry was applied with a doctor blade so as to have a constant thickness, dried, and cut into a predetermined size to produce a magnetic sheet. Next, in order to obtain a non-magnetic sheet, a butyral resin and a solvent were added to a Zn-Cu ferrite fine powder after calcining and pulverization using FeO ₂ , CuO, and ZnO as main materials to prepare a slurry. The slurry was applied with a doctor blade so as to have a constant thickness, dried, and cut into a predetermined size to produce a non-magnetic sheet. Through holes were formed at predetermined positions in the nonmagnetic sheet. Next, an Ag paste was printed on the nonmagnetic sheet using a screen plate and dried to obtain a coil conductor pattern. Next, as shown in FIG. 1, the magnetic sheet, the non-magnetic sheet, and the non-magnetic sheet on which the coil conductor is printed are stacked so that the printed coil conductor is connected through the through-hole, Press bonding was performed. At this time, magnetic sheets were used as precursors for the dummy insulating layers 17A to 17C and 18A to 18B. After cutting this to a predetermined size, it was subjected to binder removal treatment at 500 ° C. for 1 hr, and baked in an atmospheric furnace at 890 ° C. for 2 hr to form a laminate chip. An Ag paste is applied to the side surface of the obtained laminate chip by a printing method so as to connect to both ends of each of the two coils inside the laminate, and the terminal electrode is baked in air at about 600 ° C. for 1 hour. Formed. The terminal electrode was subjected to nickel electrolytic barrel plating and then subjected to solder electrolytic barrel plating to form an external electrode. In this way, a laminated common mode noise filter of Example 1 was obtained.

The laminated common mode noise filter obtained in Example 1 is as follows.
External dimensions: length 1.25mm x width 1.0mm x height 0.5mm
Magnetic layer: Ni-Zn-Cu based ferrite Nonmagnetic layer: Zn-Cu based ferrite Conductor pattern: Ag pattern with a width of 20 μm First and sixth insulating layers, dummy insulating layer: magnetic layer (Layer thickness 365 μm)
Second to fifth insulating layers: nonmagnetic layer (layer thickness 105 μm)
・ Baking temperature: 890 ° C
The angle formed by the first and second conductors (φ1 in FIG. 2): 120 °
The angle formed by the third and fourth conductors (φ2 in FIG. 2): 60 °

(Comparative Example 1)
A laminated common mode noise filter was obtained in the same manner as in Example 1 except that the fifth insulating layer was made of a magnetic material instead of a nonmagnetic material. FIG. 4 shows a laminated structure of the laminated common mode noise filter of Comparative Example 1.

The laminated common mode noise filter obtained in Comparative Example 1 is as follows.
External dimensions: length 1.25mm x width 1.0mm x height 0.5mm
Magnetic layer: Ni—Zn—Cu based ferrite Nonmagnetic layer: Zn—Cu based ferrite Conductor pattern: Ag pattern with a width of 20 μm First, fifth and sixth insulating layers, dummy insulating layer: Magnetic layer (layer thickness 370 μm)
Second to fourth insulating layers: nonmagnetic layer (layer thickness 100 μm)
・ Baking temperature: 890 ° C
The angle formed by the first and second conductors (φ1 in FIG. 2): 120 °
The angle formed by the third and fourth conductors (φ2 in FIG. 2): 60 °

(Comparative Example 2)
A laminated common mode noise filter was obtained in the same manner as in Example 1 except that the first insulating layer was made of nonmagnetic material instead of magnetic material. FIG. 5 shows a laminated structure of the laminated common mode noise filter of Comparative Example 2.

The laminated common mode noise filter obtained in Comparative Example 2 is as follows.
External dimensions: length 1.25mm x width 1.0mm x height 0.5mm
Magnetic layer: Ni—Zn—Cu based ferrite Nonmagnetic layer: Zn—Cu based ferrite Conductor pattern: Ag pattern with a width of 20 μm Sixth insulating layer, dummy insulating layer: magnetic layer (layer thickness) 360μm)
First to fifth insulating layers: nonmagnetic layer (layer thickness 110 μm)
・ Baking temperature: 890 ° C
The angle formed by the first and second conductors (φ1 in FIG. 2): 120 °
The angle formed by the third and fourth conductors (φ2 in FIG. 2): 60 °

(Example 2)
A laminated common mode noise filter was prepared in the same manner as in Example 1. A dielectric material was used as the nonmagnetic material. In order to obtain a dielectric sheet, fine powder of borosilicate glass and crystalline silica powder were added as a dielectric, and a butyral resin and a solvent were added to prepare a slurry. The slurry was applied with a doctor blade so as to have a constant thickness, dried, and cut into a predetermined size to produce a non-magnetic sheet. Except this, it was performed in the same manner as in Example 1, and the firing was also performed in the atmospheric furnace at 890 ° C. for 2 hours to form a laminate chip, and the external electrodes were also formed in the same manner as in Example 1. Thus, a laminated common mode noise filter of Example 2 was obtained. As in the first embodiment, FIG. 1 shows a laminated structure of the laminated common mode noise filter of the second embodiment.

The laminated common mode noise filter obtained in Example 2 is as follows.
External dimensions: length 1.25mm x width 1.0mm x height 0.5mm
-Magnetic layer: Ni-Zn-Cu ferrite-Nonmagnetic layer: Mixture of borosilicate glass and crystalline silica-Conductor pattern: Ag pattern with a width of 20 [mu] m-First and sixth insulating layers, dummy insulation Layer: Magnetic layer (layer thickness 365 μm)
Second to fifth insulating layers: nonmagnetic layer (layer thickness 105 μm)
・ Baking temperature: 890 ° C
The angle formed by the first and second conductors (φ1 in FIG. 2): 120 °
The angle formed by the third and fourth conductors (φ2 in FIG. 2): 60 °

(Comparative Example 3)
A laminated common mode noise filter was obtained in the same manner as in Example 2 except that the fifth insulating layer was made of a magnetic material instead of a nonmagnetic material. As in Comparative Example 1, FIG. 4 shows the laminated structure of the laminated common mode noise filter of Comparative Example 3.

The laminated common mode noise filter obtained in Comparative Example 3 is as follows.
External dimensions: length 1.25mm x width 1.0mm x height 0.5mm
Magnetic layer: Ni-Zn-Cu ferrite Nonmagnetic layer: a mixture of borosilicate glass and crystalline silica Conductor pattern: Ag pattern with a width of 20 μm First, fifth and sixth insulating layers, Dummy insulating layer: magnetic layer (layer thickness 370 μm)
Second to fourth insulating layers: nonmagnetic layer (layer thickness 100 μm)
・ Baking temperature: 890 ° C
The angle formed by the first and second conductors (φ1 in FIG. 2): 120 °
The angle formed by the third and fourth conductors (φ2 in FIG. 2): 60 °

(Comparative Example 4)
A laminated common mode noise filter was obtained in the same manner as in Example 2 except that the first insulating layer was made of nonmagnetic material instead of magnetic material. As in Comparative Example 2, FIG. 5 shows the laminated structure of the laminated common mode noise filter of Comparative Example 4.

The laminated common mode noise filter obtained in Comparative Example 4 is as follows.
External dimensions: length 1.25mm x width 1.0mm x height 0.5mm
-Magnetic layer: Ni-Zn-Cu ferrite-Nonmagnetic layer: Mixture of borosilicate glass and crystalline silica-Conductor pattern: Ag pattern with a width of 20 [mu] m-Sixth insulating layer, dummy insulating layer: magnetic Body layer (layer thickness 360μm)
First to fifth insulating layers: nonmagnetic layer (layer thickness 110 μm)
・ Baking temperature: 890 ° C
The angle formed by the first and second conductors (φ1 in FIG. 2): 120 °
The angle formed by the third and fourth conductors (φ2 in FIG. 2): 60 °

(Evaluation)
About the laminated common mode noise filter of Example 1 and Comparative Examples 1 and 2 obtained above, 4291A manufactured by Agilent, Inc., 1 MHz inductance value and 100 MHz common mode impedance value of the two coils of each filter Was measured.

The measurement results of the inductance value at 1 MHz of the two coils included in each filter are as follows.
Example 1 Forward coil (146 nH), reverse coil (142 nH), difference (3 nH)
Comparative Example 1 Forward coil (152 nH), reverse coil (143 nH), difference (9 nH)
Comparative Example 2 Forward coil (144 nH), reverse coil (135 nH), difference (8 nH)
Example 2 Forward coil (89 nH), reverse coil (87 nH), difference (2 nH)
Comparative Example 3 Forward coil (94 nH), reverse coil (89 nH), difference (5 nH)
Comparative Example 4 Forward coil (87 nH), reverse coil (82 nH), difference (5 nH)

  Here, the “forward coil” is a second coil constituted by the third and fourth conductors, and the “reverse coil” is a first coil constituted by the first and second conductors. .

The measurement result of the common mode impedance value at 100 MHz of each common mode noise filter is as follows.
Example 1 82Ω
Comparative Example 1 85Ω
Comparative Example 2 78Ω
Example 2 51Ω
Comparative Example 3 53Ω
Comparative Example 4 48Ω

  In Comparative Examples 1 and 3, since both the first conductor 121 and the fourth conductor 124 are in contact with the magnetic layer, the spiral second conductor 122 and the third conductor 123 of the common mode coil are formed. With respect to the winding direction, the inductance value of the forward coil formed by the fourth conductor 124 and the third conductor 123 connected in the forward direction is larger than the inductance value of the reverse coil. In Comparative Examples 2 and 4, since the first conductor 221 and the fourth conductor 224 are both in the nonmagnetic layer, the spiral second conductor 222 and the third conductor forming the common mode coil are used. With respect to the winding direction of the conductor 223, the inductance value of the forward coil formed by the fourth conductor 224 and the third conductor 223 connected in the forward direction is larger than the inductance value of the reverse coil. . Further, as a result of both the spiral second conductor 222 and the third conductor 223 being separated from the magnetic layer, the common mode impedance value is greatly reduced. On the other hand, in the first and second embodiments, the fourth conductor 24 connected in the forward direction with respect to the winding direction of the spiral second conductor 22 and the third conductor 23 forming the common mode coil. Is in contact with the non-magnetic layer and the first conductor 21 connected in the opposite direction is in contact with the magnetic layer, respectively, so that the inductance value of the forward coil formed by the fourth conductor 24 and the third conductor 23 The difference between the inductance value of the reverse coil formed by the first conductor 21 and the second conductor 22 is reduced. In addition, since the distance between the spiral second and third conductors 22 and 23 forming the common mode coil and the magnetic layer is not so large as in the comparative examples 2 and 4, the common mode impedance value The decrease was also reduced. As a result, in Examples 1 and 2, compared to the comparative example, a good common mode noise filter in which the difference in inductance value of each coil forming the common mode coil is small and the decrease in common mode impedance is small. Obtained.

1: Common mode noise filter 11-16, 111-116, 211-216: Insulating layer 21-24, 121-124, 221-224: Conductor 31-34, 131-134, 231-234: Terminal

Claims (5)

A first insulating layer;
A first conductor provided on an upper surface of the first insulating layer;
A second insulating layer provided on the upper surface of the first conductor;
A spiral second conductor provided on an upper surface of the second insulating layer and connected to the first conductor to form a first coil together with the first conductor;
A third insulating layer provided on the upper surface of the second conductor;
A spiral third conductor provided on the upper surface of the third insulating layer;
A fourth insulating layer provided on the top surface of the third conductor;
A fourth conductor provided on the upper surface of the fourth insulating layer and connected to the third conductor to form a second coil together with the third conductor;
A fifth insulating layer provided on an upper surface of the fourth conductor;
A sixth insulating layer provided on an upper surface of the fifth insulating layer;
Comprising first to fourth terminals respectively connected to one end of each of the first to fourth conductors;
The first conductor is connected so that at least a part thereof is directed in the opposite direction with respect to the winding direction of the spiral second conductor,
The fourth conductor is connected so that at least a part thereof is directed in the forward direction with respect to the winding direction of the spiral third conductor,
The first and sixth insulating layers are made of a magnetic material, and the second to fifth insulating layers are made of a non-magnetic material,
The first to sixth insulating layers do not contain a resin;
Common mode noise filter.   The angle formed by the direction in which the first conductor is directed to the portion connected to the second conductor and the direction in which the second conductor extends from the connected portion is 120 ° or more and smaller than 180 °. Common mode noise filter as described.   The angle formed by a direction in which the fourth conductor is directed to a portion connected to the third conductor and a direction in which the third conductor extends from the connected portion is greater than 0 ° and not more than 60 °. Or the common mode noise filter of 2.   The common mode according to claim 1, wherein the first and sixth insulating layers are made of Ni—Zn—Cu ferrite, and the third to fifth insulating layers are made of Zn—Cu ferrite. Noise filter.   The common mode noise according to any one of claims 1 to 3, wherein the first and sixth insulating layers are made of Ni-Zn-Cu ferrite, and the third to fifth insulating layers are made of a dielectric material. filter.