JP2005012072A - Laminated common mode choke coil and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated common mode choke coil that is improved in noise eliminating characteristics by optimizing normal mode and common mode impedance and, at the same time, improving the high-frequency characteristics of the coil. <P>SOLUTION: The laminated common mode choke coil 10 is constituted by installing external electrodes connected to first and second internal conductors 31 and 32 to a laminate provided with a sheet-like material layer 20, in which the internal conductors 31 and 32 are formed, and magnetic material layers 15 and 16 respectively disposed on the top and bottom surfaces of the layer 20. The sheet-like material layer 20 is provided with first and sixth sheet-like materials 21 and 26, in which lead-out electrodes and lead-out electrode connecting conductors are formed and which are laminated upon both end sections, and coil forming unit layers 27 and 28, in which internal conductors of one round amounts are separately formed in a state where the inside and outside of the conductors are exchanged to each other and the conductors do not overlap each other in the direction of lamination. The conductor of each layer is constituted in a bifilar-wound solenoid winding by electrically connecting the conductor. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stacked common mode choke coil that removes common mode noise that enters an electronic device, and a method of manufacturing the same.
[0002]
[Prior art]
Conventionally, high-speed differential transmission lines such as USB (Universal Serial Bus), IEEE 1394 (Institut of Electrical and Electronics Engineers 1394) and LDVS (Low Voltage Different Line) used in personal computers and peripheral devices. A common mode choke coil is used to remove common mode noise.
This common mode choke coil is a coil that is a magnetic combination of two or more coils. Only the common mode component is used without affecting the normal (differential) mode component in the current conduction direction. It is comprised so that may be removed. That is, it is necessary to minimize the normal mode impedance and to increase the common mode impedance as much as possible.
[0003]
In the conventional laminated common mode choke coil, a plurality of ferrite sheets formed with two substantially parallel coil patterns are laminated, and adjacent coil patterns are formed through through holes formed through the ferrite sheets. In some cases, a bifilar type solenoid winding is formed by forming two helical coils that are electrically connected in order. (For example, see Patent Document 1)
In addition, a conventional laminated common mode choke coil includes a coil portion in which coil conductors and high permeability material layers are alternately stacked, and a lead portion in which lead conductors and low permeability material layers are alternately stacked. There is a structure in which a laminated structure is provided and each coil conductor and lead conductor are electrically connected to form a laminated solenoid winding. (For example, see Patent Document 2)
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 62-257709 (pages 2 and 3, FIG. 2)
[Patent Document 2]
JP-A-5-101950 (pages 2 and 3, FIG. 1)
[0005]
[Problems to be solved by the invention]
By the way, the laminated common mode choke coil described in Patent Document 1 described above has a problem that the impedance in the normal mode is high because the wire length of the spiral coil wound by bifilar is different.
Further, the above-described laminated common mode choke coil described in Patent Document 2 has a problem that since it is a laminated solenoid winding, there is a nonmagnetic coupling region and a coupling coefficient is low. In addition, since the two overlapping solenoid coils have large areas that overlap in the upper and lower directions (overlapping in a plan view), there arises a problem that the stray capacitance that functions as a capacitor increases and the high-frequency characteristics deteriorate. .
[0006]
The present invention has been made in view of the above circumstances, and is a multilayer common that can improve noise removal characteristics by optimizing impedance and improving high frequency characteristics in both normal mode and common mode. An object of the present invention is to provide a mode choke coil and a manufacturing method thereof.
[0007]
[Means for Solving the Problems]
The present invention employs the following means in order to solve the above problems.
The laminated common mode choke coil of the present invention includes a sheet-like material layer in which a plurality of sheet-like materials made of a nonmagnetic insulating material or a magnetic material are laminated to form first and second inner conductors, and the sheet-like material A laminated common mode choke coil in which a laminate comprising magnetic material layers arranged on both upper and lower surfaces of a layer is provided with external electrodes connected to the first and second internal conductors. The sheet-like material layer replaces the inside and outside with a sheet-form material in which an extraction electrode and an extraction electrode connecting conductor are formed and laminated at both ends, and two sheet-like materials laminated adjacently. And one or a plurality of coil forming unit layers in which the inner conductor for one round is divided and formed so as not to overlap in the laminating direction, and the conductors of the respective layers are electrically connected to each other to form a bifilar type solenoid winding It was constructed in.
[0008]
If such a laminated common mode choke coil is used, the bifilar type solenoid winding in which the inner conductor for one round is divided into two adjacent sheet-like materials so that the inner and outer sides are interchanged and does not overlap in the lamination direction. Since the first and second inner conductors are used, the effective length of the magnetically coupled inner conductor can be sufficiently secured, and the line length of the magnetically coupled inner conductor can be made equal to obtain a high coupling coefficient. In addition, since the internal conductor does not overlap in the stacking direction, stray capacitance can be reduced.
[0009]
A method for manufacturing a laminated common mode choke coil according to the present invention includes a sheet-like material layer in which a plurality of sheet-like materials made of a nonmagnetic insulating material or a magnetic material are laminated to form first and second inner conductors, A laminated common mode choke coil in which a laminate comprising magnetic material layers disposed on both upper and lower surfaces of a sheet-like material layer is provided with external electrodes connected to the first and second internal conductors 2 wherein the sheet-like material layer is laminated adjacently between extraction electrode-forming layers that are formed at both ends by forming an extraction electrode and an extraction electrode connecting conductor on the sheet-like material. One or a plurality of coil forming unit layers in which inner conductors for one round are divided and formed so as not to overlap each other in the stacking direction are exchanged inside and outside the sheet material, and the conductors of each layer are electrically connected. And, forming the first and second inner conductors in bifilar solenoid winding.
[0010]
According to such a method of manufacturing a laminated common mode choke coil, the first and second inner conductors are formed by bifilar solenoid windings that do not overlap in the laminating direction, so that the stray capacitance is low, and the divided inner conductors are divided. A bifilar type solenoid winding with the inside and outside of which is switched, so that a high coupling coefficient can be obtained by equalizing the line lengths of the magnetically coupled inner conductors, and a sufficiently long effective length of the magnetically coupled inner conductors can be secured. A common mode choke coil can be easily manufactured.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a laminated common mode choke coil (hereinafter referred to as a “common mode choke coil”) and a method for manufacturing the same according to the present invention will be described with reference to the drawings. 1 is an exploded perspective view of the common mode choke coil according to the present invention, FIG. 2 is an external perspective view of the common mode choke coil showing the completed state of FIG. 1, and FIG. 3 is a magnetic coupling of the common mode choke coil according to the present invention. It is a disassembled perspective view which shows a mode.
[0012]
1 and 2, reference numeral 10 in the drawing indicates a common mode choke coil. The common mode choke coil 10 is configured by laminating a plurality of sheet-shaped magnetic materials or by laminating a plurality of sheet-shaped nonmagnetic insulating materials and magnetic materials. In addition, on the two opposing side surfaces of the common mode choke coil 10 formed as a substantially rectangular parallelepiped laminate, four external electrodes 11, 12, 13, 14 are distributed.
In the configuration example shown in FIG. 1, magnetic material layers 15 and 16 each consisting of one or a plurality of layers are arranged on both upper and lower end faces of a common mode choke coil 10 that is a laminate. Between these upper and lower magnetic material layers 15 and 16, a sheet-like material layer 20 made of at least four layers (a plurality of layers) of sheet-like material (magnetic material or nonmagnetic insulating material) is disposed.
[0013]
Each of the magnetic material layers 15 and 16 has a structure in which magnetic materials 15a, 15b, and 15c and magnetic materials 16a, 16b, and 16c are stacked in three layers. Here, the magnetic material layers 15 and 16 preferably have high transmittance, and usable sheet-like magnetic materials include, for example, Ni—Zn ferrite and Ni—Zn—Cu ferrite.
The magnetic material layers 15 and 16 are not limited to the three layers described above, and can be appropriately changed according to the type and thickness of the magnetic material.
[0014]
The illustrated sheet material layer 20 includes a first sheet material 21, a second sheet material 22, a third sheet material 23, a fourth sheet material 24, a fifth sheet material 25, and a sixth sheet from the upper surface side. In this order, the sheet-like material 26 is laminated in six layers. Here, examples of the sheet-like nonmagnetic insulating material that can be used as the sheet-like material layer 20 include a ceramic material such as alumina, a glass material such as silica, and a resin material such as polyimide resin. Further, the sheet-like magnetic material that can be used as the sheet-like material 20 includes, for example, Ni—Zn ferrite, Ni—Zn—Cu ferrite, and the like, similar to the magnetic material layers 15 and 16.
[0015]
Now, the sheet-like material layer 20 described above is laminated at both ends in the laminating direction (vertical direction) to form the first sheet-like material 21 and the sixth sheet-like material 26 that become the extraction electrode forming layers, and the extraction electrode forming layers. A laminated body having two coil forming unit layers 27 and 28 laminated therebetween is formed.
The coil forming unit layers 27 and 28 are two sheets stacked adjacent to each other like the second sheet material 22 and the third sheet material 23 and the fourth sheet material 24 and the fifth sheet material 25. Each unit is formed of a bifilar-type solenoid-wound coil around one unit of the material. In the illustrated example, the coil forming unit layers 27 and 28 are provided in two layers, but may be one layer or a plurality of layers of three or more layers.
[0016]
In this way, the sheet-like material layer 20 formed by laminating the coil-forming unit layers 27 and 28 between the extraction electrode forming layers (the first sheet-like material 21 and the sixth sheet-like material 26) at both the upper and lower ends includes As described below, the first inner conductor 31 and the second inner conductor 32 are formed in a bifilar type solenoid winding.
The first sheet-like material 21 has a lead electrode 33 that is one end of the first inner conductor 31, a lead electrode connection conductor 31 a that connects the lead electrode 33 and the solenoid-wound conductor, and part of the solenoid winding. The first coil conductor 31b is formed continuously. Further, the first sheet-like material 21 includes an extraction electrode 34 that is one end of the second internal conductor 32, an extraction electrode connection conductor 32a that connects the extraction electrode 34 and a solenoid-wound conductor, and part of the solenoid winding. The second coil conductor 32b is continuously formed. In this case, the first coil conductor 31b is arranged substantially in parallel so as not to short-circuit each other at a predetermined interval so as to be outside the second coil conductor 32b.
[0017]
The end of the first coil conductor 31b is electrically connected to one end A of the first coil inner conductor 31c formed in the second sheet-like material 22 through a through hole 21a drilled in the first sheet-like material 21. Connected. The first coil inner conductor 31c is perforated in the second sheet-like material 22 from one end A so as not to overlap the first coil conductor 31b in the stacking direction and to form a spiral coil in plan view. It is continuously formed up to the provided through hole 22a.
[0018]
The end of the second coil conductor 32b is one end B of the second coil outer conductor 32c formed in the second sheet material 22 through a through hole 21b formed in the first sheet material 21. And electrically connected. The second coil outer conductor 32c is formed in the second sheet-like material 22 from one end B so as not to overlap the second coil conductor 32b in the stacking direction and to form a spiral coil in plan view. The through hole 22b is continuously formed. The first coil inner conductor 31c and the second coil outer conductor 32c are arranged substantially in parallel so as not to short-circuit each other at a predetermined interval.
As described above, when the first sheet-like material 21 and the second sheet-like material 22 are compared, the arrangement of the first conductor 31 and the second conductor 32 can be adjusted by appropriately setting the positions of the through holes 21a and 21b. It has been replaced with.
[0019]
The other end of the first coil inner conductor 31c is one end C of the first coil outer conductor 31d formed in the third sheet material 23 through a through hole 22a formed in the second sheet material 22. And electrically connected. This first coil outer conductor 31d does not overlap the first coil inner conductor 31c in the stacking direction and forms a spiral coil in plan view from one end C to the third sheet-like material 23. The through hole 23a is continuously formed.
[0020]
The other end of the second coil outer conductor 32c is connected to the second coil inner conductor 32d formed in the third sheet material 23 through a through hole 22b formed in the second sheet material 22. One end D is electrically connected. The second coil inner conductor 32d does not overlap the second coil outer conductor 32c in the stacking direction and forms a spiral coil in a plan view from one end D to the third sheet-like material 23. The through hole 23b is continuously formed. The first coil outer conductor 31d and the second coil inner conductor 32d are arranged substantially in parallel so as not to short-circuit each other at a predetermined interval.
As described above, when the second sheet-like material 22 and the third sheet-like material 23 are compared, the arrangement of the first conductor 31 and the second conductor 32 can be adjusted by appropriately setting the positions of the through holes 22a and 22b. It has been replaced with.
[0021]
The second sheet-like material 22 and the third sheet-like material 23 described above become a coil forming unit layer 27 constituting a single bifilar type solenoid winding by laminating two sheet-like materials. That is, the first coil inner conductor 31c, the first coil outer conductor 31d, the second coil outer conductor 32c, and the second coil inner conductor 32d are electrically connected to each other in a vertically divided conductor. Without being short-circuited, two coils are formed that are arranged substantially in parallel and go round in a spiral shape and do not overlap in plan view. In such a bifilar type coil, two coils have the same length by switching the inside and outside of the inner conductor.
[0022]
In other words, the second sheet-like material 22 and the third sheet-like material 23 described above form substantially the same conductor pattern and through hole unless the first inner conductor 31 and the second inner conductor 32 are distinguished from each other. It can be used after being rotated 180 degrees. The total conductor length of the first coil inner conductor 31c and the second coil outer conductor 32c and the total conductor length of the first coil outer conductor 31d and the second coil inner conductor 32d are both coil It can also be said that it is divided so as to be equal to the length of one round.
[0023]
Similarly, the 4th sheet-like material 24 and the 5th sheet-like material 25 become the coil formation unit layer 28 which comprises one bifilar type | mold solenoid winding by laminating | stacking two sheet-like materials.
The first coil inner conductor 31c of the fourth sheet material 24 is formed from one end E to the through hole 24a that is electrically connected to the first coil outer conductor 31d of the third sheet material 23 through the through hole 23a. ing. The second coil outer conductor 32c of the fourth sheet-like material 24 extends from one end F, which is electrically connected to the second coil inner conductor 32d of the third sheet-like material 23, through the through hole 23b to the through hole 24b. Is formed.
[0024]
The first coil outer conductor 31d of the fifth sheet material 25 is formed from one end G to the through hole 25a electrically connected to the first coil inner conductor 31c of the fourth sheet material 24 through the through hole 24a. ing. Further, the second coil inner conductor 32d of the fifth sheet-like material 25 extends from one end H to the through hole 25b, which is electrically connected to the second coil outer conductor 32c of the fourth sheet-like material 24 through the through hole 24b. Is formed.
In this case, the conductor pattern of the fourth sheet material 24 and the positions of the through holes 24a and 24b coincide with the second sheet 22 described above, and the conductor pattern of the fifth sheet material 25 and the positions of the through holes 25a and 25b are described above. 4 sheets of sheet-like material having substantially the same conductor pattern and through-hole positions are prepared, rotated by 180 degrees for each layer, and laminated to form two coil forming unit layers 27, 28 may be laminated.
[0025]
In the sixth sheet-like material 26, an extraction electrode 35 that is the other end of the first inner conductor 31 and an extraction electrode connection conductor 31e that connects the extraction electrode 35 and a solenoid-wound conductor are continuously formed. Yes. Further, the sixth sheet-like material 26 is continuously formed with an extraction electrode 36 which is the other end of the second inner conductor 32 and an extraction electrode connection conductor 32e which connects the extraction electrode 36 and a solenoid-wound conductor. Has been. Depending on the arrangement of the external electrodes 11, 12, 13, and 14, an extraction electrode connection conductor that connects the extraction electrodes 35 and 36 and the solenoid-wound conductor may be formed in the same manner as the first sheet material 21. Also good.
The conductors 31a to 31e, 32a to 32e and the lead electrodes 33, 34, 35, and 36 forming the first inner conductor 31 and the second inner conductor 32 are printed or plated with a conductor such as silver, for example. It is formed on the surface of a nonmagnetic insulating material by a known method.
[0026]
Thus, the first inner conductor 31 and the second inner conductor 32 are laminated from the first sheet material 21 to the sixth sheet material 26, and the conductors formed in each material are electrically connected, The two coils of the solenoid winding are configured as a bifilar type solenoid winding formed adjacent to each other without overlapping each other. Also, in each solenoid coil, conductors formed on adjacent sheet-like materials do not overlap in the stacking direction.
Therefore, since the first conductor 31 and the second conductor 32 are divided and formed on the inner side where the line length becomes shorter and the outer side where the line length becomes longer, the effective lengths thereof, that is, the extraction electrodes 33, 34, 35 are formed. The lengths of the conductors arranged in parallel to each other except for the portion necessary for connection to the, 36 can be ensured to be long by adopting bifilar winding, and the length can be set to be the same. .
[0027]
A method for manufacturing the common mode choke coil 10 of the present invention configured as described above will be described below.
First, the first sheet material 21, the second sheet material 22, the third sheet material 23, the fourth sheet material 24, the fifth sheet material 25, and the sixth material having a predetermined shape (for example, rectangular shape). A sheet-like material 26 is produced.
Next, the five sheet-like materials of the first sheet-like material 21 to the fifth sheet-like material 25 are subjected to drilling at a predetermined position by a well-known method such as laser and punching, and through holes 21a to 25a, 21b to 25b are provided.
[0028]
Next, a conductor pattern and a lead electrode that are part of the first inner conductor 31 and the second inner conductor 32 are printed on the upper surfaces of the first sheet material 21 to the sixth sheet material 26. They are formed so as not to short-circuit each other by using a known method such as plating or plating.
Further, each through hole 21a to 25a, 21b to 25b is filled with a conductive material such as silver so as to be continuous with a conductor formed on the sheet-like material provided with the through hole. Note that the conductor on the sheet-like material side connected through the through-hole is electrically connected by contacting the conductor of the through-hole by providing a convex electrode portion (not shown) at the end of the conductor. It is like that.
[0029]
Next, six sheet-like materials are laminated from the first sheet-like material 21 to the sixth sheet-like material 26 to form the sheet-like material layer 20. As a result, the first inner conductor 31 and the second inner conductor 32 are electrically connected to each other through conductors formed in the respective layers, so that the bifilar type solenoid in which adjacent coils in the stacking direction do not overlap. A winding is composed.
In addition, the magnetic material layers 15 and 16 are laminated | stacked up and down so that the sheet-like material layer 20 may be inserted | pinched, and a laminated body is completed.
[0030]
The common mode choke coil 10 described above may be laminated by forming a plurality of sets of internal conductors at a predetermined pitch with respect to each sheet-like material. In this case, the above-described lamination is performed by cutting by dicing or the like. Many bodies can be manufactured at the same time.
Finally, the external electrodes 11, 12, 13, and 14 made of a conductor such as silver are formed by connecting to the extraction electrodes 33, 34, 35, and 36 exposed on the opposite side surfaces of the laminated body, respectively. A common mode choke coil having a configuration is manufactured. By such a manufacturing method, the bifilar solenoid winding common mode choke coil 10 in which the lengths of the first inner conductor 31 and the second inner conductor 32 are equal can be easily manufactured.
The external electrodes 11, 12, 13, and 14 may be plated on the upper surface of a conductor such as silver as necessary.
[0031]
The common mode choke coil 10 thus configured ensures a sufficient length of the first inner conductor 31 and the second inner conductor 32 that contribute to magnetic coupling as a bifilar type solenoid winding, and does not contribute to magnetic coupling. Since the internal conductors are reduced as much as possible and the lengths of both internal conductors 31 and 32 contributing to magnetic coupling are made equal, the common mode impedance value can be increased and the normal mode impedance value can be kept low. .
[0032]
FIG. 3 is a diagram showing a state of magnetic coupling in the common mode in the common mode choke coil 10 described above.
In this case, since the lengths of the first inner conductor 31 and the second inner conductor 32 that contribute to the magnetic coupling are set equal, the first conductor 31 and the second conductor 32 influence each other in each layer, and the arrows Z1, Magnetic coupling is performed like Z2, Z3, Z4, and Z5. As a result, as indicated by arrows Z6 and Z7, a large magnetic coupling occurs in the entire common mode choke coil 10, so that the common mode impedance value can be increased.
That is, by sufficiently securing the effective length of the inner conductor that contributes to the magnetic coupling, the impedance value in the common mode is increased to improve the noise removal performance, and the length of both inner conductors that contribute to the magnetic coupling is increased. By making them equal, the impedance value in the normal mode is reduced and the current flows easily, that is, the laminated common mode choke coil 10 does not affect the high-speed signal waveform.
[0033]
Furthermore, in the bifilar type solenoid winding described above, the internal conductors formed in the upper and lower layers do not overlap with each other, so that the stray capacitance between the two conductors decreases. In addition, since the facing area between the inner conductors that are magnetically coupled can be reduced by adopting the bifilar type, the capacitance of the capacitor can also be reduced.
In other words, since the bifilar type is adopted, the conductors arranged on the same sheet-like material are magnetically coupled, and the conductor heights (thicknesses) of the first inner conductor 31 and the second inner conductor 32 have a facing area. It will be determined. This conductor height is considerably small, unlike the conductor line width that becomes the opposing area when the conductors overlapped in the laminating direction of the sheet-like material are magnetically coupled.
[0034]
As a specific example, in the current conductor forming technology, for example, the conductor line width of about 50 to 100 μm is set as the opposing area, so that the thickness of, for example, about 10 μm becomes the opposing area. Since the opposing area can be reduced to about 1/5 to 1/10 by magnetically coupling between the conductors wound by bifilar, it is possible to obtain good high-frequency characteristics while keeping the capacitor capacity low. it can.
In addition, the structure of this invention is not limited to embodiment mentioned above, In the range which does not deviate from the summary of this invention, it can change suitably.
[0035]
【The invention's effect】
According to the laminated common mode choke coil of the present invention, since the first conductor and the second conductor are configured as bifilar solenoid windings, the lengths of the first inner conductor and the second inner conductor are equal, and the high coupling coefficient Since the mutual magnetic coupling becomes high, the impedance value in the normal mode is reduced. In addition, since the effective length of the inner conductors arranged in parallel to each other and magnetically coupled can be sufficiently secured, the common mode impedance value is increased. Therefore, the impedance is optimized in both the normal mode and the common mode, and further, good high frequency characteristics can be obtained, so that the multilayer common mode choke coil with further improved noise removal characteristics can be obtained.
[0036]
In addition, according to the method for manufacturing a laminated common mode choke coil according to the present invention, a high capacity can be obtained with a low capacitance as a capacitor, a line length of an inner conductor to be magnetically coupled is equally high, and This makes it easy to manufacture a laminated common mode choke coil capable of sufficiently securing the effective length of the inner conductor to be magnetically coupled, and to provide a product with high noise removal characteristics, low cost and high reliability.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an embodiment of a laminated common mode choke coil according to the present invention.
FIG. 2 is a perspective view showing a completed state of FIG. 1;
FIG. 3 is a diagram showing a state of magnetic coupling in the stacked common mode choke coil of FIG. 1;
[Explanation of symbols]
10 Multilayer type common mode choke coil (common mode choke coil)
11, 12, 13, 14 External electrodes 15, 16 Magnetic material layers 15a, 15b, 15c, 16a, 16b, 16c Magnetic material 20 Sheet-like material layer 21 First sheet-like material (leading electrode forming layer)
22 2nd sheet material 23 3rd sheet material 24 4th sheet material 25 5th sheet material 26 6th sheet material (leading electrode formation layer)
27, 28 Coil forming unit layer 31 First inner conductor 32 First inner conductor 33, 34, 35, 36 Lead electrode

Claims (2)

A sheet-like material layer in which a plurality of sheet-like materials made of a non-magnetic insulating material or a magnetic material are laminated to form first and second inner conductors, and a magnetic material layer disposed on both upper and lower surfaces of the sheet-like material layer A laminated common mode choke coil provided with an external electrode connected to the first and second internal conductors in a laminate comprising:
The sheet-like material layer has an extraction electrode and an extraction electrode connecting conductor formed on the sheet-like material and is laminated on both ends, and the two sheet-like materials laminated adjacently are exchanged inside and outside. A laminated common mode comprising one or a plurality of coil forming unit layers in which inner conductors for one round are divided and formed so as not to overlap in the laminating direction, and the conductors of each layer are electrically connected to form a bifilar type solenoid winding choke coil. A sheet-like material layer in which a plurality of sheet-like materials made of a non-magnetic insulating material or a magnetic material are laminated to form first and second inner conductors, and a magnetic material layer disposed on both upper and lower surfaces of the sheet-like material layer A multilayer common mode choke coil manufacturing method in which an external electrode connected to the first and second internal conductors is provided in a multilayer body comprising:
The sheet-like material layer forms an extraction electrode and an extraction electrode connecting conductor on the sheet-like material, and is formed between two sheet-like materials laminated adjacently between the extraction electrode formation layers laminated on both ends. The coil forming unit layer is formed by laminating one or more inner conductors so as not to overlap in the stacking direction, and the first and second conductors are electrically connected to each other by electrically connecting the conductors of the respective layers. A method for manufacturing a laminated common mode choke coil in which a bifilar type solenoid winding is formed.

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