JP2006286934A - Common mode choke coil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a common mode choke coil exhibiting excellent performance while sustaining small size and low-profile. <P>SOLUTION: The common mode choke coil 1 comprises a lamination 30 consisting of an insulator layer 20 embedding coil conductors 31 and 32 arranged oppositely and magnetic plates 11 and 12 laid in layers to sandwich the insulator layer 20 in the thickness direction, and terminal electrodes 41-44 formed on the surface of the lamination 30. The insulator layer 20 consists of a second magnetic body portion 22 and a nonmagnetic body portion 21, at least the portion between the pair of coil conductors 31 and 32 is composed of the nonmagnetic body portion 21, and at least one of the lead-out electrodes 53 and 54 connecting the inner circumferential end of the coil conductor 31 and the terminal electrode and the lead-out electrodes 51 and 52 connecting the outer circumferential end and the terminal electrode penetrates the second magnetic body portion 22. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a common mode choke coil used for the purpose of removing common mode noise in applications such as high-speed differential transmission, and more particularly to a non-winding type common mode choke coil.

Common mode choke coils are roughly classified into a winding type and a non-winding type. The latter non-winding type coil is preferable from the viewpoint of miniaturization and low profile. Conventionally, as a basic structure of a non-winding type common mode choke coil, one described in Patent Document 1 is known. This common mode choke coil includes a pair of magnetic substrates made of ferrite or the like, and a laminated body sandwiched between the magnetic substrates. The laminate is a laminate of an insulator layer, a coil conductor layer, and an extraction electrode layer. The insulator layer is made of a material such as polyimide resin or epoxy resin.
JP-A-8-203737

  In general, this type of common mode choke coil has a problem of improving performance as a common mode choke coil while maintaining a small and low profile. Here, improving the performance means increasing the common mode impedance without degrading the normal mode impedance.

  The idea for improving the common mode impedance includes (1) a method of increasing the magnetic flux in the component. Specific methods of this method include (1a) increasing the magnetic permeability of the magnetic material and (1b) increasing the number of turns of the coil. As another idea for improving the common mode impedance, (2) a method of reducing a magnetic flux loop can be mentioned. Specific examples of this method include (2a) increasing the core diameter, and (2b) reducing the distance between the coil and the magnetic body to further reduce the magnetic current loop.

  Consider each method to improve common mode impedance. Although the method (1a) is considered to be the most effective method, the improvement in the magnetic permeability depends on the magnetic material, which results in the problem of developing an excellent material. In other words, it is a technique that cannot be solved unless an excellent material can be developed, which has great difficulty.

  When the above methods (1b) and (2a) are realized with parts aiming at miniaturization, the core diameter and the number of turns of the coil are in a trade-off relationship, so it is difficult to realize both at the same time. . In order to avoid this, there can be considered a method in which the coil is formed of a plurality of coil layers and the number of turns of the coil per layer is reduced. Moreover, when realizing the above (2a) under such conditions, it is conceivable to increase the number of turns by increasing the fine pitch of the coil wiring. However, the wiring cross-sectional area is reduced by increasing the fine pitch and the wiring is increased by increasing the number of turns. As the length increases, the resistance of the wiring itself increases, resulting in a problem of deteriorating normal mode impedance.

  Considering the above method (2b), the conventional common mode choke coil described above has a structure in which the coil is embedded in a nonmagnetic insulator layer. For this reason, there is a limit in reducing the distance between the coil and the magnetic body, and there has been a problem that the improvement of the common mode impedance cannot be expected sufficiently.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a common mode choke coil having excellent performance while maintaining a small and low profile.

  In order to achieve the above object, in the present application, a pair of first magnetic bodies in which a pair of spiral coils arranged opposite to each other are embedded, and a pair of first magnetic bodies laminated so as to sandwich the insulator layer in the thickness direction And a terminal electrode formed on the surface of the laminate, wherein the insulator layer is a second magnetic body portion made of a magnetic material and a nonmagnetic material made of a nonmagnetic material. And at least a pair of coils is formed of a non-magnetic material portion, and is an extraction electrode that connects the inner peripheral side end of the coil and the terminal electrode or an extraction electrode that connects the outer peripheral end and the terminal electrode. It is proposed that at least one of them penetrates the second magnetic part.

  According to the present invention, the insulator layer includes the second magnetic body portion made of a magnetic material, and the lead electrode or the outer peripheral side end portion and the terminal electrode that connect the inner peripheral side end portion and the terminal electrode of the coil. Since at least one of the extraction electrodes connecting the first and second electrodes penetrates the second magnetic body portion, the distance between the first magnetic body sandwiching the laminated body and the magnetic region and the coil by the second magnetic body portion is reduced. Can take. As a result, the magnetic flux loop is reduced as described in (2b) above, so that the common mode impedance can be improved while maintaining a compact and low-profile component shape.

  As described above, according to the present invention, the gap between the magnetic region and the coil can be made small, so that the loop of the magnetic flux is reduced, thereby reducing the common mode impedance while maintaining a small and low-profile component shape. Can be improved.

(First embodiment)
A common mode choke coil according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of a common mode choke coil, and FIG. 2 is an exploded perspective view of a laminate.

  As shown in FIG. 1, the common mode choke coil 1 includes a laminated body 30 in which a pair of magnetic plates 10 and 11 and an insulating layer 20 sandwiched between the magnetic plates 10 and 11 are laminated, and the laminated body. Terminal electrodes 41, 42, 43, 44 formed on the side surfaces of 30. The magnetic plates 10 and 11 are made of a ferromagnetic material, for example, a ferrite sintered body.

  As shown in FIG. 2, the insulator layer 20 is connected to a pair of spiral coil conductors 31, 32 arranged opposite to each other, and outer peripheral side ends of the coil conductors 31, 32 to terminal electrodes 41, 42. The lead electrodes 51 and 52 and lead electrodes 53 and 54 for connecting the inner peripheral side end portions of the coil conductors to the terminal electrodes 43 and 44 are embedded. The extraction electrodes 51 and 52 are formed in the same layer as the coil conductors 31 and 32. The extraction electrodes 53 and 54 are formed in a different layer from the coil conductors 31 and 32. The lead electrodes 53, 54 extend from the terminal electrodes 43, 44 to a position overlapping the inner peripheral side end portions of the coil conductors 31, 32 in the thickness direction, and the end portions are on the inner peripheral side of the coil conductors 31, 32. The ends are electrically connected by vias. As materials for the coil conductors 31 and 32 and the extraction electrodes 51 to 54, a metal having excellent conductivity, for example, Ag, Pd, Cu, Al, or an alloy thereof is used.

  The characteristic point of the present invention is the structure of the insulator layer 20 in which the coil is embedded. The structure of the insulator layer 20 will be described with reference to the cross-sectional view of FIG. As shown in FIG. 3, the insulator layer 20 includes a nonmagnetic part 21 made of a nonmagnetic material and a magnetic part 22 made of a magnetic material. The nonmagnetic part 21 is formed so as to be interposed between the coil conductors 31 and 32. The magnetic body portion 22 is filled in a portion of the insulator layer 20 other than the nonmagnetic body portion 21. Therefore, at least portions of the extraction electrodes 51 and 52 formed in the same layer as the coil conductors 31 and 32, in the vicinity of the terminal electrodes 41 and 42, extraction electrodes 53 and 54 formed in a different layer from the coil conductors 31 and 32, and the coil conductors. Vias 61 and 62 that electrically connect 31 and 32 and the extraction electrodes 53 and 54 are embedded in the magnetic part 22.

  As the nonmagnetic part 21, the same substrate as that used as a printed wiring board or an interlayer insulating layer in a thin film process is used, and benzocyclobutene (BCB), polyimide, epoxy, polyester, etc. that are generally used in these. The organic resin is used as a material. The magnetic part 22 is made of a resin such as benzocyclobutene (BCB), polyimide, epoxy, or polyester mixed with a magnetic material such as ferrite powder as a filler, an aerosol deposition method, a ferrite plating method, a sputtering method, or a laser deposition. It consists of ferrite formed by a non-sintered film-forming method such as CVD or CVD. The materials of the nonmagnetic part 21 and the magnetic part 22 are preferably selected so that their thermal expansion coefficients are close to or coincide with each other. Furthermore, it is preferable that the materials of the non-magnetic part 21 and the magnetic part 22 are selected so that the thermal expansion coefficients are close to or coincide with those of the magnetic plates 10 and 11.

  Next, a method for manufacturing the common mode choke coil will be described. First, the insulator layer 20 is manufactured using a build-up method that has been conventionally employed in the manufacture of printed wiring boards. Specifically, the coil conductors 31 and 32 are formed on both surfaces of the base serving as the nonmagnetic part 21 by plating, etching, printing, an ink jet method, or the like. Then, after laminating the magnetic body portion 22 by an aerosol deposition method, a ferrite plating method, a sputtering method, a laser vapor deposition method, a CVD or a resin containing a ferrite powder, a thermal vacuum laminating method, an isostatic press, etc. After forming the holes for forming, the extraction electrodes 53 and 54 are formed, and further, the resin to be the magnetic body portion 22 is formed. Since the insulator layer 20 is formed as described above, the laminated body 30 is obtained by bonding the magnetic plates 10 and 11 so as to sandwich the insulator layer 20 and cutting them for each unit component. After that, the common mode choke coil 1 is obtained by forming the terminal electrodes 41 to 44 on the side surface of the laminate 30 by vapor deposition, sputtering, electroless plating, dipping method, printing method or the like.

  As described above, according to the common mode choke coil according to the present embodiment, at least portions of the extraction electrodes 51 and 52 near the terminal electrodes 41 and 42 and the extraction electrodes 53 and 54 are embedded in the magnetic body portion 22. It has a structured. In other words, the insulator layer 20 is the non-magnetic part 21 only between the pair of coil conductors 31 and 32, and the other part is the magnetic part 22. With such a structure, the coil conductors 31 and 32 are in contact with the magnetic region including the magnetic bodies 10 and 11 and the magnetic body portion 22. Therefore, the loop of the magnetic flux becomes extremely small, so that the common mode impedance is improved.

  In the present embodiment, the insulating layer 20 is formed by forming each layer in the direction of the magnetic plates 10 and 11 by the build-up method around the non-magnetic portion 21 interposed between the pair of coil conductors 31 and 32. Thus, the thickness of the non-magnetic part 21 can be stabilized with high accuracy. The thickness of the non-magnetic part 21 greatly affects the characteristics of the common mode choke coil, which is preferable from the viewpoint of stability of characteristics.

  In the above embodiment, the center of the magnetic flux of each of the coil conductors 31 and 32 has been described with respect to the open magnetic circuit type common mode choke coil in which the nonmagnetic body portion 21 is not magnetically coupled. As shown in the drawing, a hole may be formed in the non-magnetic body portion 21 so that the magnetic body portion 22 is filled in the position where the center of the magnetic flux of each of the coil conductors 31 and 32 passes. As a result, a closed magnetic circuit type common mode choke coil 1 'is obtained.

(Second Embodiment)
A common mode choke coil according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 5 is an exploded perspective view of the laminate, and FIG. 6 is a cross-sectional view of the common mode choke coil.

  The common mode choke coil 2 according to the present embodiment is different from the first embodiment in that an extraction electrode 53 formed in a layer different from the coil conductor 31 and a coil conductor 32 as shown in FIGS. The extraction electrode 54 formed in a different layer is formed in the same layer. Specifically, the lead electrode 54 is formed in the same layer as the lead electrode 53 by passing a via 62 connecting the coil conductor 32 and the lead electrode 54 through the nonmagnetic material portion 21. Other configurations and manufacturing methods are the same as those of the first embodiment.

  According to the present embodiment, the insulator layer 20 can be formed thinner than the first embodiment, which is preferable from the viewpoint of downsizing and low profile. Moreover, since the number of layers of the insulator layer 20 decreases, it is suitable also from a viewpoint of manufacturing cost. Further, since the distance between one of the coil conductors 31 and 32 and the magnetic plates 10 and 11 (the distance between the coil conductor 32 and the magnetic plate 11 in FIGS. 5 and 6) can be reduced, the common mode impedance can be reduced. It is also suitable from the viewpoint of improvement. Other operations and effects are the same as those in the first embodiment. As in the first embodiment, a closed magnetic circuit type common mode choke coil may be used as a modification.

(Third embodiment)
A common mode choke coil according to a third embodiment of the present invention will be described with reference to the drawings. 7 is an exploded perspective view of the laminate, and FIG. 8 is a cross-sectional view of the common mode choke coil.

  The common mode choke coil 3 according to the present embodiment is different from the first embodiment in that a pair of coils is formed over multiple layers. In the present embodiment, as shown in FIGS. 7 and 8, coil conductors 31 and 33 relating to one coil are formed in different layers. The inner peripheral side ends of the coil conductors 31 and 33 are connected to each other by a via 61. The outer peripheral side end of the coil conductor 33 is connected to the terminal electrode 43 via the extraction electrode 53 formed in the same layer. Similar to the first embodiment, a coil conductor 32 related to the other coil is formed at a position facing the coil conductor 31 with the nonmagnetic part 21 interposed therebetween. A coil conductor 34 is formed in a layer different from the coil conductor 32. The inner peripheral side ends of the coil conductors 32 and 34 are connected to each other by a via 62. The outer peripheral side end portion of the coil conductor 34 is connected to the terminal electrode 44 through an extraction electrode 54 formed in the same layer.

  That is, when the common mode choke coil 3 according to the present embodiment is compared with the first embodiment, in the first embodiment, the inner peripheral side end portions of the coil conductors 31 and 32 and the terminal electrodes 43, The difference between the two is that the extraction electrodes 53 and 54 provided for connecting 44 are made to function as a part of the coil in this embodiment. Other configurations and manufacturing methods are the same as those in the first embodiment.

  According to the common mode choke coil 3 according to the present embodiment, the number of turns of each coil can be increased without changing the thickness of the insulator layer 20 as compared with the first embodiment. This is preferable from the viewpoint of improving impedance. Other operations and effects are the same as those in the first embodiment. As in the first embodiment, a closed magnetic circuit type common mode choke coil may be used as a modification.

(Fourth embodiment)
A common mode choke coil according to a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 9 is an exploded perspective view of the laminate. FIG. 10 is a cross-sectional view of a common mode choke coil.

  The common mode choke coil 4 according to the present embodiment is different from the third embodiment in that the coil conductors 35 and 37 formed in multiple layers forming one coil as shown in FIGS. In addition, the coil conductors 36 and 38 formed in multiple layers forming other coils are alternately stacked. Hereinafter, it will be described in detail with reference to the drawings.

  The spiral coil conductor 35 and the coil conductor 36 are formed so as to face each other with the nonmagnetic body portion 21 therebetween. The outer peripheral side end portions of the coil conductors 35 and 36 are connected to the terminal electrodes 42 and 43 through lead electrodes 55 and 56 formed in the same layer, respectively. The inner peripheral side end of the coil conductor 35 is connected to the inner peripheral side end of the spiral coil conductor 37 via a via 63 that penetrates the nonmagnetic part 21. The coil conductor 37 is located between the coil conductor 36 and the magnetic plate 11. The outer peripheral side end of the coil conductor 37 is connected to the terminal electrode 44 via an extraction electrode 57 formed in the same layer. Similarly, the inner peripheral end of the coil conductor 36 is connected to the inner peripheral end of the spiral coil conductor 38 via a via 64 that penetrates the non-magnetic member 21. The coil conductor 38 is located between the coil conductor 35 and the magnetic plate 10. The outer peripheral side end of the coil conductor 38 is connected to the terminal electrode 41 via an extraction electrode 58 formed in the same layer.

  As described above, the coil conductors forming each coil are alternately stacked. Therefore, in order to ensure the magnetic coupling between the coil conductors for one coil, the common mode choke coil 4 according to the present embodiment penetrates through the center of the non-magnetic part 21 as shown in FIG. A closed magnetic circuit type filled with the magnetic body portion 22 is preferable.

  According to the common mode choke coil 4 according to the present embodiment, as a result of the simulation, the normal mode impedance is reduced as compared with the case of taking the closed magnetic circuit type modification in the third embodiment. was gotten. Other functions and effects are the same as those of the third embodiment.

(Fifth embodiment)
A common mode choke coil according to a fifth embodiment of the present invention will be described with reference to the drawings. FIG. 11 is a cross-sectional view of a common mode choke coil.

  The common mode choke coil 5 according to the present embodiment is different from the above embodiments in the structure of the insulator layer 20. Specifically, in each of the above embodiments, the coil conductor is embedded in the magnetic body portion 22, but in this embodiment, the coil conductor is embedded in the non-magnetic body portion 21. is there. Other structures are the same as those in the above embodiments. This embodiment will be described as a modification of the common mode choke coil of the fourth embodiment.

  As shown in FIG. 11, the nonmagnetic body portion 21 is formed so as to embed the first nonmagnetic body portion 21 a interposed between the pair of coil conductors 35 and 36 and the coil conductors 35 to 38. It consists of a second non-magnetic part 21b. Part of the extraction electrodes 55 to 58 connecting the coil conductors 35 to 38 and the terminal electrodes 41 to 44 penetrates the magnetic body portion 22. The materials of the first nonmagnetic body portion 21a and the second nonmagnetic body portion 21b will be described together with the following manufacturing method.

  A method for manufacturing the common mode choke coil 5 will be described with reference to FIGS. 12 and 13 are diagrams for explaining a method of manufacturing a common mode choke coil. The following description is a method for manufacturing a large number of common mode choke coils in a lump.

  First, a through-hole 102 for forming a via is formed in the base 101 corresponding to the first nonmagnetic body portion 21a ((a) in FIG. 12). As the base 101, a film having a predetermined thickness, a copper-clad laminate (RCC) or a substrate of a flexible printed wiring board is used, and benzocyclobutene (commonly used in these) is used. BCB), polyimide, epoxy, polyester and other organic resins are used as materials.

  Next, the coil conductor pattern 103 is formed on both surfaces of the base 101 by a conductor pattern forming method such as plating, etching, printing, and an ink jet method (FIG. 12B). Here, the through hole 102 is also filled with a conductor.

  Next, the insulating layer 104 corresponding to the second nonmagnetic material portion 21a is formed on both surfaces (FIG. 12C). The insulating layer 104 is formed by laminating an RCC or dry film insulating layer by a thermal vacuum laminating method, an isostatic pressing method, or the like, and when this is a liquid, it is laminated by a spin coating method. In particular, the use of a thermal vacuum laminate is preferable in terms of suppressing variations in film thickness. Various organic resins are used as the material of the insulating layer 104, but the resin may be either a thermoplastic resin or a thermosetting resin.

  Examples of thermosetting resins include benzocyclobutene (BCB), epoxy resin, phenol resin, unsaturated polyester resin, vinyl ester resin, polyimide resin (PI), polyphenylene ether oxide resin (PPO), bismaleimide triazine cyanate ester Examples thereof include resins, fumarate resins, polybutadiene resins, and polyvinyl benzyl ether resins. Examples of thermoplastic resins include very low density polyethylene resin (VLDPE), low density polyethylene resin (LDPE), linear low density polyethylene resin (LLDPE), medium density polyethylene resin (MDPE), and high density polyethylene resin (HDPE). ), Polypropylene resin (PP), polybutene resin, polymethylpentene resin, polyvinyl alcohol resin, ethylene / vinyl alcohol copolymer, polyacrylonitrile, polyamide resin, polyacetal resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyphenylene sulfide resin, Examples include polyetheretherketone resins, isotactic polystyrene resins, liquid crystal polymers, and the like.

  When a thermoplastic resin is used, it is important that the plastic temperature of the outer insulating resin layer is lower than that of the insulating resin layer serving as a base in order to prevent fluctuation of the inner insulating layer thickness due to lamination.

  Next, through holes for forming vias are formed by the same procedure as described above, the coil conductor pattern 105 is formed, and the insulating layer 106 is formed (FIG. 12D). Next, a through-hole 107 for filling the material for forming the magnetic body portion 22 is formed by a chemical method such as etching (FIG. 12E).

  Next, the through-hole 107 is filled with the resin 108 for forming the magnetic body portion 22, and the magnetic plate 109 is bonded to both surfaces to obtain a laminated plate (FIG. 13 (f)). As a material for forming the magnetic body portion 22, a material such as benzocyclobutene (BCB), polyimide, epoxy, or polyester mixed with a magnetic material such as ferrite powder as a filler, an aerosol deposition method, or ferrite plating is used. It consists of ferrite formed by non-sintered film formation methods such as sputtering, laser deposition, and CVD. Next, a laminated body is obtained by cutting this laminated board for each unit part (FIG. 13G). Finally, the common mode choke coil 5 is obtained by forming terminal electrodes on the side surfaces of the laminate by vapor deposition, sputtering, electroless plating, dipping, barrel plating, printing, or the like.

  According to the common mode choke coil according to the present embodiment, the distance between the coil and the magnetic region is larger than that of the fourth embodiment, but is smaller than that of the above-described conventional one. Therefore, the loop of the magnetic flux becomes extremely small, so that the common mode impedance is improved.

  Further, in the present embodiment, as in the first embodiment, the magnetic plates 10 and 11 are oriented around the first nonmagnetic body portion 21a interposed between the pair of opposed coil conductors 35 and 36. In addition, since the insulator layer 20 is formed by forming each layer by the build-up method, the thickness of the first nonmagnetic body portion 21a can be stabilized with high accuracy. Since the thickness of the first non-magnetic member 21a greatly affects the characteristics of the common mode choke coil, it is preferable from the viewpoint of stability of characteristics.

  Although this embodiment has been described as a modification of the fourth embodiment, this modification can also be applied to the first to third embodiments, and both the closed magnetic circuit type and the open magnetic circuit type are applicable. Applicable to. For example, a closed magnetic circuit type common mode choke coil having the coil structure described in the third embodiment has a structure as shown in FIG. As shown in FIG. 14, the common mode choke coil 5 ′ has a structure in which the coil conductors 31 to 34 are embedded in the nonmagnetic part 21. The extraction electrodes 51 to 54 penetrate the magnetic body portion 22. The nonmagnetic body portion 21 includes a first nonmagnetic body portion 21 a interposed between the coil conductors 31 and 32 and a second nonmagnetic body portion 21 b in which the coil conductors 31 to 34 are embedded. The non-magnetic part 21 has a structure in which a hole is formed at the center position of the magnetic flux, and the magnetic part 22 is filled in the hole. Other configurations are the same as those of the third embodiment.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this. For example, in the above embodiment, a two-circuit four-terminal common mode choke coil having a pair of coils built therein has been described. However, the present invention also applies to a three-circuit six-terminal or four-circuit eight-terminal common mode choke coil having a built-in coil. Can be applied. Moreover, in the said 3rd-5th embodiment, although one coil was formed over two layers, you may make it form over three or more layers.

External perspective view of the common mode choke coil according to the first embodiment The disassembled perspective view explaining the structure of the laminated body which concerns on 1st Embodiment Sectional drawing of the laminated body which concerns on 1st Embodiment Sectional drawing of the laminated body which concerns on the other example of 1st Embodiment The exploded perspective view explaining the structure of the laminated body which concerns on 2nd Embodiment Sectional drawing of the laminated body which concerns on 2nd Embodiment The exploded perspective view explaining the structure of the laminated body which concerns on 3rd Embodiment Sectional drawing of the laminated body which concerns on 3rd Embodiment The exploded perspective view explaining the structure of the laminated body which concerns on 4th Embodiment Sectional drawing of the laminated body which concerns on 4th Embodiment Sectional drawing of the laminated body which concerns on 5th Embodiment The figure explaining the manufacturing method of the common mode choke coil which concerns on 5th Embodiment The figure explaining the manufacturing method of the common mode choke coil which concerns on 5th Embodiment Sectional drawing of the laminated body which concerns on the other example of 5th Embodiment

Explanation of symbols

  1, 2, 3, 4, 5 ... common mode choke coil, 10, 11 ... magnetic plate, 20 ... insulator layer, 21 ... non-magnetic part, 22 ... magnetic part, 30 ... laminate, 31-38 ... Coil conductors, 41 to 44, terminal electrodes, 51 to 58, extraction electrodes, 61 to 64, vias.

Claims (5)

A laminated body comprising an insulator layer in which a pair of spiral coils arranged opposite to each other are embedded, and a pair of first magnetic bodies laminated so as to sandwich the insulator layer in the thickness direction, and the surface of the laminate In the common mode choke coil provided with the terminal electrode formed in
The insulator layer includes a second magnetic body portion made of a magnetic material and a nonmagnetic body portion made of a nonmagnetic material,
At least between the pair of coils consists of a non-magnetic part,
At least one of an extraction electrode for connecting the inner peripheral side end of the coil and the terminal electrode or an extraction electrode for connecting the outer peripheral end and the terminal electrode penetrates the second magnetic body portion. Common mode choke coil. The common mode choke coil according to claim 1, wherein the pair of coils are embedded in a nonmagnetic part. The common mode choke coil according to claim 1, wherein the pair of coils are disposed on a boundary surface between the non-magnetic body portion and the second magnetic body portion. The common mode choke coil according to any one of claims 1 to 3, wherein each of the pair of coils includes a plurality of coil layers formed in different layers and connected to each other. 5. The common mode choke coil according to claim 4, wherein a coil layer relating to one coil and a coil layer relating to another coil are alternately laminated.

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