JP6876729B2 - Common mode choke coil - Google Patents

Description

The present disclosure relates to a common mode choke coil for removing common mode noise from a differential transmission circuit that transmits a differential signal. More specifically, the present disclosure relates to a common mode choke coil suitable for use in a differential transmission circuit that transmits a differential signal using three signal lines per lane.

MIPI defined by the MIPI (mobile industry processor interface) alliance as a standard for transmitting data between a processor and peripheral devices in a mobile device.
D-PHY (hereinafter, simply referred to as "D-PHY") is known. In the D-PHY compliant mobile devices currently in widespread use, signals are typically transmitted differentially using a data signal line of 4 lanes and a clock signal line of 1 lane. In D-PHY, it is stipulated that a differential signal is transmitted using two signal lines per lane, so a total of ten signal lines are used. In D-PHY, data transmission of up to 2.5 Gbit / sec is realized.

In recent years, with the increasing performance of peripheral devices such as cameras and displays mounted on mobile devices, further speeding up of data transmission in mobile devices has been required. For this reason, the MIPI Alliance formulated M-PHY as a new physical layer standard in 2011. With M-PHY, it is possible to realize data transmission of up to 5.8 Gbit / s per lane.

However, in order to comply with M-PHY, it is necessary to drastically change the physical layer designed for D-PHY. The need for a major change from D-PHY is a factor that hinders the spread of M-PHY. Therefore, C-PHY was formulated in 2014 in order to realize high-speed data transmission while diverting the physical layer of D-PHY. C-PHY stipulates that signals are differentially transmitted using three signal lines per lane while using the same physical layer configuration as D-PHY. In this way, in C-PHY, the data transmission speed is further increased by increasing the number of signal lines per lane from two to three without making major changes to the physical layer of D-PHY. ..

The D-PHY, M-PHY, and C-PHY specifications are published on the MIPI Alliance web page (http://mipi.org/specifications/physical-layer).

A common mode choke coil is used to remove common mode noise from a differential transmission circuit through which a differential signal is transmitted. The common mode choke coil includes a plurality of coil conductors, and these coils function as an inductor that generates a large impedance with respect to the common mode noise, so that the common mode noise can be removed from the differential transmission circuit. Conventional common mode choke coils include, for example, JP-A-2003-77727, JP-A-2007-150209, JP-A-2013-153184, JP-A-2014-179570, JP-A-2015-012167 and the like. It is disclosed in.

In the common mode choke coil, it is desirable that the common mode noise is removed while the signal waveform is not deteriorated. Therefore, each coil provided in the common mode choke coil is configured so that its characteristic impedance matches the characteristic impedance of each signal line of the differential transmission line.

Japanese Unexamined Patent Publication No. 2003-77727 JP-A-2007-150209 Japanese Unexamined Patent Publication No. 2013-153184 Japanese Unexamined Patent Publication No. 2014-179570 Japanese Unexamined Patent Publication No. 2015-012167

The common mode choke coil includes a plurality of coil conductors formed in a spiral shape in order to exert a function as an inductor. For example, a common mode choke coil for a differential transmission circuit conforming to MIPI C-PHY includes three spiral coil conductors according to the number of signal lines per lane of the circuit. In a common mode choke coil including such three coil conductors, it is desirable that the characteristic impedance (differential impedance) between the three coil conductors is matched with the characteristic impedance of the differential transmission circuit.

In order to match the characteristic impedance between the coil conductors with the characteristic impedance of the differential transmission circuit, it is desired that the characteristic impedance between the coil conductors is not biased. For this purpose, it is desired that the stray capacitance generated between the coil conductors is not biased. Therefore, normally, in order to eliminate the bias of the stray capacitance between the coil conductors in each circuit, each of the three coil conductors is wound at equal intervals with each other.

However, when the three coil conductors are wound over a plurality of turns while maintaining equal intervals from each other, the stray capacitance generated between the coil conductors in the adjacent turns biases the stray capacitance between the coil conductors. Will occur. For example, when the common mode choke coil includes three coil conductors from the first coil conductor to the third coil conductor, the floating capacitance between the first coil conductor and the second coil conductor in a certain circumference and Each coil conductor is arranged so that the floating capacitance between the second coil conductor and the third coil conductor and the floating capacitance between the third coil conductor and the first coil conductor are the same as each other. However, due to the floating capacitance generated between the coil conductors in the adjacent circuit, the floating capacitance between the coil conductors is biased. That is, since each conductor coil is wound at equal intervals, the outermost coil conductor in a certain circumference and the innermost coil conductor in the outermost circumference are different types of coil conductors. A relatively large floating capacitance is generated between these coil conductors. By winding the coil conductors at equal intervals in this way, it is possible to prevent the stray capacitance between the coil conductors from being biased within the same orbit, but the stray capacitance generated between the coil conductors in the adjacent orbits. This causes a bias in the stray capacitance between the coil conductors. Then, due to the influence of the stray capacitance generated across the adjacent laps, it becomes impossible to match all the characteristic impedances between the coil conductors with the characteristic impedances of the differential transmission circuit.

The present disclosure provides improvements for reducing stray capacitance bias generated between coil conductors in a common mode choke coil having three coil conductors. An object of the present disclosure is to provide a common mode choke coil capable of suppressing a bias in stray capacitance between coil conductors due to stray capacitance generated between coil conductors in an adjacent circuit in one aspect thereof. To do. Other objects of the present invention will be made clear through the description throughout the specification.

The common mode choke coil according to an embodiment of the present invention includes a first coil conductor provided on a first coil forming surface in a first insulator and wound around a coil shaft, and the first insulation. A second coil conductor provided on the second coil forming surface in the body and wound around the coil shaft, and a second coil conductor provided on the third coil forming surface in the first insulating body and around the coil shaft. It comprises a wound third coil conductor. In the embodiment, the second coil conductor is formed in a shape different from that of the first coil conductor and the third coil conductor, and the first coil conductor, the second coil conductor, and the second coil conductor. The third coil conductor extends parallel to each other in a first region in a plan view along the coil axis when viewed from the axial direction. In the embodiment, the first coil conductor, the second coil conductor, and the third coil when viewed in cross section in a plane cut along the plane including the coil shaft in the first region. The arrangement order of the conductors from the inside in the radial direction on the nth lap is opposite to that on the n + 1th lap (where n + 1 is the number of turns of the first coil conductor and that of the second coil conductor. It is an arbitrary natural number that does not exceed either the number of turns or the number of turns of the third coil conductor). For example, when the first coil conductor, the second coil conductor, and the third coil conductor are arranged in this order from the inside on the nth lap, the third coil conductor from the inside and the second coil conductor are arranged on the n + 1th lap. The coil conductor and the first coil conductor are arranged in this order.

By arranging each coil conductor in this way, the same coil conductors can be arranged at the shortest distance in adjacent orbits. For example, in the nth lap, the first coil conductor, the second coil conductor, and the third coil conductor are arranged in this order from the inside, and in the n + 1th lap, the third coil conductor and the second coil conductor are arranged from the inside. When the first coil conductors are arranged in this order, the third coil conductor is arranged at the shortest distance between the nth lap and the n + 1th lap. Therefore, the distance between the third coil conductor on the n + 1th lap and the first coil conductor and the second coil conductor on the nth lap is the distance between the third coil conductor and the nth lap on the n + 1th lap. It will be longer than the distance to the third coil conductor in the eye. On the other hand, in the conventional common mode choke coil in which each coil conductor is wound at equal intervals, for example, the first coil conductor, the second coil conductor, and the third coil conductor are arranged in this order from the inside on the nth circumference. If this is the case, the first coil conductor, the second coil conductor, and the third coil conductor are arranged in this order from the inside even on the n + 1th lap. In this case, the third coil conductor and the first coil conductor are arranged at the shortest distance in the adjacent nth and n + 1th laps.

As is well known, the longer the distance between two conductors, the smaller the capacitance generated between the conductors. According to the above-described embodiment, the distance between the same coil conductors (for example, between the third coil conductors) can be made shorter than the distance between different coil conductors on the adjacent nth and n + 1th laps. .. Therefore, according to the above-described embodiment, the stray shape generated between the coil conductors of the adjacent orbits is compared with the conventional common mode choke coil in which the distance between the different coil conductors is the shortest in the adjacent orbits. It is possible to suppress the bias of stray capacitance between each coil conductor due to capacitance. In the present specification, the term "stray capacitance" is used between the coil conductor of a common mode choke coil and another conductor, unless otherwise explained or otherwise understood in the context. It is a stray capacitance that is generated and means a stray capacitance that affects the characteristic impedance between the coil conductors of a common mode choke coil.

In another embodiment of the present invention, in the first region, a line segment on the n + 1th circumference of the first coil conductor, a line segment on the n + 1th circumference of the second coil conductor, and the first line segment of the second coil conductor. The line segment on the nth + 1st lap of the coil conductor 3 passes through the midpoint between the line segment on the nth lap of the first coil conductor and the line segment on the n + 1th lap and extends parallel to the coil axis. The nth line segment of the first coil conductor, the nth line segment of the second coil conductor, and the nth line segment of the third coil conductor with respect to the plane. And are provided symmetrically with each other.

According to the embodiment, the distance between the same coil conductors can be made shorter than the distance between different coil conductors on the adjacent nth and n + 1th laps. Therefore, compared to the conventional common mode choke coil in which the distance between different coil conductors is the shortest in the adjacent orbits, the stray capacitance generated between the coil conductors in the adjacent orbits causes the floating between the coil conductors. It is possible to suppress the bias of capacitance.

According to the disclosure of the present specification, in a common mode choke coil having three coil conductors, the deviation of stray capacitance between the coil conductors can be reduced.

The perspective view of the common mode choke coil which concerns on one Embodiment of this invention. It is an exploded perspective view of the common mode choke coil which concerns on one Embodiment of this invention. It is a top view which shows the 1st insulating layer provided in the common mode choke coil of FIG. 2 and the 1st conductor layer formed in the 1st insulating layer. It is a top view which shows the 2nd insulating layer provided in the common mode choke coil of FIG. 2 and the 2nd conductor layer formed in the 2nd insulating layer. It is a top view which shows the 3rd insulating layer provided in the common mode choke coil of FIG. 2 and the 3rd conductor layer formed in the 3rd insulating layer. It is a top view which shows the 4th insulating layer provided in the common mode choke coil of FIG. 2 and the 4th conductor layer formed in the 4th insulating layer. It is a schematic plan view which represented by superimposing the 2nd conductor layer 22 of FIG. 4 on the 1st conductor layer 12 of FIG. It is sectional drawing which shows typically the 1st conductor layer, the 2nd conductor layer, and the 3rd conductor layer in the cross section which cut the common mode choke coil of FIG. 2 by the line AA. It is a schematic cross-sectional view corresponding to FIG. 8 of the conventional common mode choke coil. It is a schematic cross-sectional view corresponding to FIG. 8 of the conventional common mode choke coil. It is an exploded perspective view of the common mode choke coil which concerns on other embodiment of this invention. It is a top view which shows the 1st insulating layer provided in the common mode choke coil of FIG. 11 and the 1st conductor layer formed in the 1st insulating layer. It is a top view which shows the 2nd insulating layer provided in the common mode choke coil of FIG. 11 and the 2nd conductor layer formed in the 2nd insulating layer. FIG. 5 is a schematic plan view showing the first conductor layer 112 of FIG. 12 and the second conductor layer 122 of FIG. 13 superimposed. It is a top view which shows the 3rd insulating layer provided in the common mode choke coil of FIG. 11 and the 3rd conductor layer formed in the 3rd insulating layer. FIG. 5 is a cross-sectional view schematically showing a first conductor layer, a second conductor layer, and a third conductor layer in a cross section obtained by cutting the common mode choke coil of FIG. 11 along the line BB. It is an exploded perspective view of the common mode choke coil which concerns on other embodiment of this invention. It is sectional drawing which shows typically the cross section which cut the common mode choke coil of FIG.

Hereinafter, various embodiments of the present invention will be described with reference to the drawings as appropriate. The components common to the plurality of drawings are designated by the same reference numerals throughout the plurality of drawings. It should be noted that each drawing is not always drawn to the correct scale for convenience of explanation.

FIG. 1 is a perspective view of a common mode choke coil according to an embodiment of the present invention. The common mode choke coil 1 shown in FIG. 1 includes a lower dummy insulating layer 2, a laminate 3, an upper dummy insulating layer 4, and terminal electrodes 5a, 5b, 6a, 6b, 7a, and 7b. .. The dummy insulating layers 2 and 4 are layers made of a magnetic material or a non-magnetic material, respectively, and have excellent insulating properties. When the dummy insulating layers 2 and 4 are made of a magnetic material, Ni—Zn—Cu-based ferrite can be used as the magnetic material. The common mode choke coil 1 has dimensions of, for example, 1.25 mm × 1.0 mm × 0.5 mm.

The terminal electrodes 5a, 5b, 6a, 6b, 7a, 7b are provided on the side surface of the laminated body 3 and extend to the upper surface and the lower surface of the common mode choke coil 1 as shown in the figure. The terminal electrodes 5a, 5b, 6a, 6b, 7a, 7b are formed, for example, by applying Ag paste to the side surface of the laminate 3.

Next, the laminated body 3 will be described with reference to FIGS. 2 to 6. As shown in the exploded perspective view of FIG. 2, in one embodiment of the present invention, the laminated body 3 is a first layer laminated between the lower magnetic layer 8, the upper magnetic layer 9, and these magnetic layers. 1 insulating layer 11, 1st conductor layer 12, 2nd insulating layer 21, 2nd conductor layer 22, 3rd insulating layer 31, 3rd conductor layer 32, lead electrode insulating layer 41, lead conductor A layer 42 and a cover insulating layer 51 are provided.

The lower magnetic layer 8 and the upper magnetic layer 9 are layers made of a magnetic material, respectively. As this magnetic material, for example, Ni-Zn-Cu-based ferrite can be used.

The first insulating layer 11, the second insulating layer 21, the third insulating layer 31, the lead electrode insulating layer 41, and the cover insulating layer 51 are all layers made of a non-magnetic material, and have excellent insulating properties. Have. Examples of the non-magnetic material include various resin materials (for example, polyimide resin, epoxy resin, and resin materials other than these), various dielectric ceramics (glass borosilicate, a mixture of borosilicate glass and crystalline silica, and these. Dielectric ceramics other than) and various non-magnetic ferrites (for example, Zn—Cu-based ferrites) can be used. In one embodiment of the present invention, the non-magnetic material includes, for example, various ferrite materials having a dielectric constant of 20 or less, various resin materials having a dielectric constant of 10 or less, various dielectric ceramic materials, or various materials having a dielectric constant of 6 or less. Dielectric ceramic materials are used.

The first conductor layer 12, the second conductor layer 22, the third conductor layer 32, and the lead conductor layer 42 are made of a metal material such as Ag. It is desirable that this metal material has excellent conductivity and workability. As this metal material, Cu or Al can be used in addition to Ag.

The materials of each magnetic layer, each insulating property, and each conductor layer described above are merely examples, and other than those explicitly described in the present specification, depending on the required performance and required characteristics of the common mode choke coil 1. Can also use various materials.

In the illustrated laminate 3, the first insulating layer 11 is formed on the lower magnetic layer 8. When the vertical direction is referred to in the present specification, the upper direction of FIG. 2 is referred to as the upper direction and the lower direction of FIG. 2 is referred to as the lower direction, unless otherwise understood in the context.

A first conductor layer 12 is formed on the first insulating layer 11. As shown in FIG. 3, the first conductor layer 12 is formed on a coil conductor 13, a drawer conductor 14 having one end connected to the outer end of the coil conductor 13, and an inner end of the coil conductor 13. An extraction conductor 15 to which one end thereof is connected and an extraction electrode 16 connected to the extraction conductor 14 are provided. The extraction electrode 16 is electrically connected to the terminal electrode 5a. The coil conductor 13 has a spiral shape in which the coil conductor 13 is wound a plurality of times around the coil shaft CA. The coil shaft CA is a virtual axis extending in the stacking direction of the laminated body 3 (that is, the vertical direction of the common mode choke coil 1). In one embodiment, the coil shaft CA extends in a direction substantially orthogonal to the first insulating layer 11.

A second insulating layer 21 is formed on the first conductor layer 12. A second conductor layer 22 is formed on the second insulating layer 21. As shown in FIG. 4, the second conductor layer 22 includes a spiral-shaped coil conductor 23, a drawer conductor 24 whose one end is connected to the outer end of the coil conductor 23, and the inside of the coil conductor 23. An extraction conductor 25 having one end connected to the end portion and an extraction electrode 26 connected to the extraction conductor 24 are provided. The extraction electrode 26 is electrically connected to the terminal electrode 6a. The coil conductor 23 has a spiral shape that is wound a plurality of times around the coil shaft CA.

A third insulating layer 31 is formed on the second conductor layer 22. A third conductor layer 32 is formed on the third insulating layer 31. As shown in FIG. 5, the third conductor layer 32 includes a spiral-shaped coil conductor 33, a drawer conductor 34 whose one end is connected to the outer end of the coil conductor 33, and the inside of the coil conductor 33. An extraction conductor 35 having one end connected to the end portion and an extraction electrode 36 connected to the extraction conductor 34 are provided. The extraction electrode 36 is electrically connected to the terminal electrode 7a. The coil conductor 33 has a spiral shape that is wound a plurality of times around the coil shaft CA.

An insulating layer 41 for an extraction electrode is formed on the third conductor layer 32. A lead conductor layer 42 is formed on the lead electrode insulating layer 41. The extraction conductor layer 42 is connected to the extraction conductor 43a, the extraction conductor 43b, the extraction conductor 43c, the extraction electrode 44a connected to the extraction conductor 43a, the extraction electrode 44b connected to the extraction conductor 43b, and the extraction conductor 43c. The lead-out electrode 44c and the like are provided. The extraction electrode 44a is electrically connected to the terminal electrode 5b. The extraction electrode 44b is electrically connected to the terminal electrode 6b. The extraction electrode 44c is electrically connected to the terminal electrode 7b.

In order to connect the end of the lead conductor 15 of the first conductor layer 12 and the end of the lead conductor 43a, a pad P17 is formed on the first insulating layer 11 and a through through the second insulating layer 21. The hole TH27 is formed, the through hole TH37 is formed in the third insulating layer 31, and the through hole TH47 is formed in the lead electrode insulating layer 41. The through holes TH27, TH37, and TH47 are formed by embedding a metal material such as Ag in the through holes formed in the second insulating layer 21, the third insulating layer 31, and the insulating layer 41 for the extraction electrode. A pad P28 is formed on the second insulating layer 21 and a through through the third insulating layer 31 in order to connect the end of the lead conductor 25 of the second conductor layer 22 and the end of the lead conductor 43b. The hole TH38 is formed, and the through hole TH48 is formed in the lead electrode insulating layer 41. In order to connect the end of the lead conductor 35 of the third conductor layer 32 and the end of the lead conductor 43c, a pad P39 is formed on the third insulating layer 31, and a through is formed on the lead electrode insulating layer 41. Hall TH49 is formed. Each of these pads and through holes is formed in the same manner as the pads P17 and through holes TH27, respectively.

With the above configuration and arrangement, in the common mode choke coil 1, three coils are provided between the terminal electrodes 5a, 6a, 7a and the terminal electrodes 5b, 6b, 7b. That is, the outer end of the coil conductor 13 is electrically connected to the terminal electrode 5a via the extraction conductor 14 and the extraction electrode 16, and the inner end of the coil conductor 13 is the extraction conductor 15, pad P17, through hole TH27, and through. Since it is electrically connected to the terminal electrode 5b via the hole TH37, the through hole TH47, the extraction conductor 43a, and the extraction electrode 44a, the first one including the coil conductor 13 between the terminal electrode 5a and the terminal electrode 5b. Coil is constructed. Further, the outer end of the coil conductor 23 is electrically connected to the terminal electrode 6a via the extraction conductor 24 and the extraction electrode 26, and the inner end of the coil conductor 23 is the extraction conductor 25, the pad P28, the through hole TH38, and the through. Since it is electrically connected to the terminal electrode 6b via the hole TH48, the extraction conductor 43b, and the extraction electrode 44b, a second coil including the coil conductor 23 is formed between the terminal electrode 6a and the terminal electrode 6b. Will be done. Further, the outer end of the coil conductor 33 is electrically connected to the terminal electrode 7a via the extraction conductor 34 and the extraction electrode 36, and the inner end of the coil conductor 33 is the extraction conductor 35, the pad P39, the through hole TH49, and the drawer. Since it is electrically connected to the terminal electrode 7b via the conductor 43c and the extraction electrode 44c, a third coil including the coil conductor 33 is formed between the terminal electrode 7a and the terminal electrode 7b. Each of these three coils is a planar coil formed on a plane. Each of these three coils is connected to, for example, three signal lines in a C-PHY compliant differential transmission circuit developed by the MIPI Alliance.

Next, an example of a method for manufacturing the common mode choke coil 1 will be described. First, a magnetic material sheet to be the lower dummy insulating layer 2, the upper dummy insulating layer 4, the lower magnetic layer 8, and the upper magnetic layer 9 is prepared. In order to prepare this magnetic sheet, a slurry is prepared by adding a solvent to a butyral resin to Ni-Zn-Cu-based ferrite fine powder after calcining and crushing using FeO2, CuO, ZnO, and NiO as main materials. This slurry is applied with a doctor blade so as to have a constant thickness. The coated slurry is dried, and the dried slurry is cut into a predetermined size to form a magnetic material sheet that becomes a lower dummy insulating layer 2, an upper dummy insulating layer 4, a lower magnetic layer 8, and an upper magnetic layer 9. Are obtained respectively.

Next, a non-magnetic material sheet to be the first insulating layer 11, the second insulating layer 21, the third insulating layer 31, the lead electrode insulating layer 41, and the cover insulating layer 51 is prepared. In order to prepare this non-magnetic sheet, a slurry is prepared by adding a butyral resin and a solvent to Zn—Cu-based ferrite fine powder after calcining and pulverizing using FeO2, CuO, and ZnO as main materials. This slurry is applied with a doctor blade so as to have a constant thickness. The applied slurry is dried, and the dried slurry is cut into a predetermined size to form a first insulating layer 11, a second insulating layer 21, a third insulating layer 31, and an insulating layer 41 for an extraction electrode. And a non-magnetic sheet to be the cover insulating layer 51 can be obtained. Through holes are formed in each non-magnetic material sheet at positions corresponding to each through holes. The through hole is formed, for example, by punching out a magnetic material sheet or irradiating the magnetic material sheet with a laser to make a hole.

By printing Ag paste on the non-magnetic material sheet corresponding to the first insulating layer 11 among the non-magnetic material sheets thus produced using a screen plate, a pattern corresponding to the first conductor layer 12 is obtained. Is formed. Similarly, by printing the Ag paste on the non-magnetic sheet corresponding to the second insulating layer 21 using a screen plate, a pattern corresponding to the second conductor layer 22 is formed, and the third insulating layer 31 is formed. By printing the Ag paste on the non-magnetic sheet corresponding to the above using a screen plate, a pattern corresponding to the third conductor layer 22 is formed, and the screen is formed on the non-magnetic sheet corresponding to the insulating layer 41 for the extraction electrode. By printing the Ag paste using the plate, a pattern corresponding to the lead conductor layer 42 is formed. Each pad is also formed with a pattern corresponding to the first conductor layer 12 or the second conductor layer 22. Further, Ag is embedded in the through holes formed in each non-magnetic material sheet. The first conductor layer 12, the second conductor layer 22, the third conductor layer 22, and the lead conductor layer 42 are formed by various known methods. For example, for the formation of these conductor layers, it is possible to use a thin film process such as vapor deposition using a mask, a thin film process such as sputtering, plating on a seed layer formed by the thin film process, or a micro transfer process such as nanoimprint. it can. In conductors made by printing or micro transfer process, it is difficult to increase the height (aspect ratio) with respect to the width of the conductor, and it is usually less than 1, but in conductors made by thin film process or plating, it is less than 1. , The aspect ratio can be easily adjusted, and can be set to 1 or more, for example. Therefore, the stray capacitance can be easily designed by forming the conductor patterns of the first conductor layer 12, the second conductor layer 22, the third conductor layer 22, and the lead conductor layer 42 by the thin film process or plating. ..

Next, the plurality of magnetic sheets and non-magnetic sheets produced as described above are laminated in the order shown in FIG. 2 so that the printed conductor pattern is conducted through the through holes. The plurality of magnetic sheets and the plurality of non-magnetic sheets laminated in this way are press-bonded. The press-bonded laminate is cut to a predetermined size, and the cut laminate is fired at a predetermined temperature to form a laminate chip. Next, the Ag paste is applied to the side surface of the laminated chip formed in this manner and baked to form terminal electrodes 5a, 5b, 6a, 6b, 7a, 7b. However, when various resin materials are used as the material, the terminal electrodes 5a, 5b, 6a, by applying the Ag conductive resin paste to the side surface of the formed laminate chip and heat-curing it without firing. 6b, 7a, 7b are formed. In this way, the common mode choke coil 1 is created. The method for producing the common mode choke coil 1 described above is only an example, and the method for producing a common mode choke coil to which the present invention can be applied is not limited to the method described above.

The arrangement of the coil conductor 13, the coil conductor 23, and the coil conductor 33 in a plan view will be further described with reference to FIGS. 3 to 5 again and also with reference to FIG. 7. As shown in FIG. 3, the coil conductor 13 comprises a spiral-shaped line segment provided between the end of the lead conductor 14 and the end of the lead conductor 15. As shown in FIG. 4, the coil conductor 23 comprises a spiral-shaped line segment provided between the end of the lead conductor 24 and the end of the lead conductor 25. As shown in FIG. 5, the coil conductor 33 comprises a spiral-shaped line segment provided between the end of the lead conductor 34 and the end of the lead conductor 35. In one embodiment of the present invention, the coil conductor 33 is formed in the same shape as the coil conductor 13 in a plan view. Further, in one embodiment of the present invention, the coil conductor 33 is arranged at a position overlapping the coil conductor 13 in a plan view.

FIG. 7 is a schematic plan view showing the arrangement of the coil conductor 13 and the coil conductor 23 by superimposing the second conductor layer 22 on the first conductor layer 12. In FIG. 7, the coil conductor 13 is shown by a broken line, and the coil conductor 23 is shown by a solid line. As shown in FIG. 7, the line segment of the coil conductor 13 and the line segment of the coil conductor 23 are in the axial direction when the common mode choke coil 1 is viewed in a plan view (that is, the common mode choke coil 1 is along the coil axis CA. (When viewed from), in the first region R1, it is configured and arranged so as to extend parallel to each other. On the other hand, the line segment of the coil conductor 13 and the line segment of the coil conductor 23 are configured and arranged so as to intersect each other in the second region R2 when the common mode choke coil 1 is viewed in a plan view.

As shown in FIG. 7, in the first circumference of the coil conductor 13 and the coil conductor 23 (for convenience, the number of turns of each coil conductor is counted from the outside), the first before entering the second region R2. In the region R1, the coil conductor 23 is arranged outside the coil conductor 13 in a plan view. In the second region R2, the parallel arrangement of the coil conductor 13 and the coil conductor 23 is broken, and they intersect so that the coil conductor 23 enters the inside while the coil conductor 13 exits the outside. When entering the first region R1 again after passing through the second region R2, the coil conductor 13 extends the lane outside the coil conductor 23 in parallel with the coil conductor 23. The coil conductor 13 and the coil conductor 23 extend in the circumferential direction while maintaining this arrangement through the first region R1. When entering the second region R2 in the second lap, the two intersect so that the coil conductor 13 enters inward while the coil conductor 23 exits outward, contrary to the case of the first lap. When the coil conductor 23 exits the second region R2 and enters the first region R1 again in the second round, the coil conductor 23 extends the lane outside the coil conductor 13 in parallel with the coil conductor 13. The coil conductor 13 and the coil conductor 23 extend in the circumferential direction while maintaining this arrangement through the first region R1, and enter the third lap. Hereinafter, in the same manner, the coil conductor 13 and the coil conductor 23 are stretched in the circumferential direction until they are connected to the lead conductor 15 and the lead conductor 25, respectively. As described above, in one embodiment of the present invention, the coil conductor 33 is arranged so as to overlap the coil conductor 13 in a plan view. In this case, what has been said about the coil conductor 13 with reference to FIG. 7 applies equally to the coil conductor 33. For example, the coil conductor 33 is arranged inside the coil conductor 23 in a plan view up to the front of the second region R2 in the first lap, but has passed through the second region R2 in the first lap. After that, it passes through the lane outside the coil conductor 23. This arrangement continues until it passes through the second region R2 again on the second lap.

It should be noted that even if the coil conductor 13, the coil conductor 23, and the coil conductor 33 intersect in a plan view, the coil conductors are electrically insulated from each other. That is, even in the second region R2, since the line segment of the coil conductor 13 and the line segment of the coil conductor 23 are arranged apart from each other in the vertical direction, the line segment of the coil conductor 13 and the coil conductor 23 are electrically separated. Is insulated. When the common mode choke coil 1 is viewed in cross section in a cross section cut by a plane including the coil shaft CA, the line segment of the coil conductor 13 and the coil conductor 23 are arranged apart from each other in the region R2.

In the embodiment shown in FIG. 7, the coil conductor 13, the coil conductor 23, and the periphery of the upper left corner of the coil conductor 33 are set as the second region, but the second region is any position on the circumference of each coil. Can be provided in. For example, the periphery of the upper right corner of each coil conductor may be used as the second region, or the portion other than the corner may be used as the second region. It is desirable that the line segments of the coil conductor 13, the coil conductor 23, and the coil conductor 33 have a length in the first region R1 longer than a length in the second region R2. By lengthening the line segment of each coil conductor in the first region R1, the section in which each coil conductor is arranged in parallel can be increased. As a result, the balance of stray capacitance generated between the coil conductors in the same circumference can be maintained.

Next, the arrangement of the coil conductor 13, the coil conductor 23, and the coil conductor 33 will be further described with reference to FIG. FIG. 8 is a cross-sectional view schematically showing a cross section of the common mode choke coil 1 cut along a plane including the coil shaft CA (for example, a cross section cut along the line AA shown in FIGS. 3 to 5). In the embodiment shown in FIG. 8, the coil conductor 33 is arranged at a position overlapping the coil conductor 13 in a plan view.

As described with reference to FIG. 7, the coil conductor 23 is arranged outside the coil conductor 13 and the coil conductor 33 before passing through the second region R2 in the first round. In the second lap, this arrangement is replaced, and the coil conductor 13 and the coil conductor 33 are arranged outside the coil conductor 23. In other words, when viewed in cross section in a cross section cut by a plane including the coil shaft CA, the arrangement order of the coil conductor 13, the coil conductor 23, and the coil conductor 33 from the radial inside in the nth circumference is the n + 1th. The order is reversed on the lap. For example, in the first lap, the coil conductor 13 (or the coil conductor 33) and the coil conductor 23 are arranged in this order from the inside in the radial direction, but in the second lap, the coil conductor 23 and the coil conductor 13 are arranged in the opposite order. (Or coil conductor 33) are arranged in this order. This arrangement is further replaced in the third lap and further replaced in the fourth lap. As a result, as shown in FIG. 8, the coil conductor 23 is arranged outside the coil conductor 13 and the coil conductor 33 in the first and third laps, and the second and fourth laps and the fourth lap. At the circumference, it is arranged inside the coil conductor 13 and the coil conductor 33. In other words, the coil conductor 13 and the coil conductor 33 are arranged inside the coil conductor 23 in the first and third laps, and outside the coil conductor 23 in the second and fourth laps. Be placed. As a result, the arrangement of the first lap and the second lap of each coil conductor is plane symmetric with respect to the virtual plane VS1 passing between the first lap and the second lap. .. That is, the line segment of the second circumference of the coil conductor 13 is arranged at a position symmetrical to the line segment of the first circumference of the coil conductor 13 with respect to the virtual plane VS1. The same relationship applies to the coil conductor 23 and the coil conductor 33. This virtual plane VS1 passes through the midpoint between the line segment of the first circumference and the line segment of the second circumference of the coil conductor 23, and extends in a direction perpendicular to each insulating layer shown in FIG. 2 and the like. It is a plane. Similarly, the arrangement of the second lap and the third lap of each coil conductor is plane symmetric with respect to the virtual plane VS2 passing between the second lap and the third lap, and the third lap. The arrangement of the eyes and the arrangement of the fourth lap are plane symmetric with respect to the virtual plane VS3 passing between the third lap and the fourth lap. As will be apparent to those skilled in the art, the above description of the positional relationship of the coil conductors will be applicable to the case where each coil conductor is wound by five or more turns, as will be apparent to those skilled in the art. In FIG. 8, the coil conductor 13 and the coil conductor 33 are arranged at the same position in the plan view, but as described above, the coil conductor 13 and the coil conductor 33 are arranged at different positions in the plan view. May be good. For example, the coil conductor 33 may be arranged outside the coil conductor 13 in the first round. In this example, the arrangement order of each coil conductor from the inside in the radial direction in the first round is coil conductor 13, coil conductor 33, and coil conductor 23. In this case, the arrangement order of the coil conductors from the inside in the radial direction in the first lap is opposite to the arrangement order in the first lap, so that the coil conductor 23, the coil conductor 33, and the coil conductor 13 are arranged.

In one embodiment of the present invention, the coil conductor 13, the coil conductor 23, and the coil conductor 33 have a floating capacitance C ₁₂ and a coil conductor 23 generated between the coil conductor 13 and the coil conductor 23 in the first region R1. _{The floating capacitance C 23} generated between the coil conductor 33 and the coil conductor 33 and the _{floating capacitance C 31} generated between the coil conductor 33 and the coil conductor 13 are equal to each other (that is, C ₁₂ = C ₂₃ = C _31). (To be). In this way, by making the floating capacitances between the coil conductors in the same circuit equal, the characteristic impedance Z ₁₂ between the coil conductor 13 and the coil conductor 23 and the characteristic impedance Z between the coil conductor 23 and the coil conductor 33. _{23 , and the matching of the characteristic impedance Z 31} between the coil conductor 33 and the coil conductor 13 can be prevented from being broken by the floating capacitance between these coil conductors. In the example shown in FIG. 8, the line segment of the coil conductor 13 and the line segment of the coil conductor 23 are _{arranged apart by a distance L 12} in the same circumference, and the line segment of the coil conductor 23 and the line segment of the coil conductor 33 are arranged. Is arranged at a distance L ₂₃ , and the line segment of the coil conductor 33 and the line segment of the coil conductor 13 are arranged apart by a _{distance L 31.}

Since the coil conductor 13, the coil conductor 23, and the coil conductor 33 are formed in a spiral shape, between the line segments of these coil conductors in each orbit and the line segments of the coil conductors in the orbits adjacent to each orbit. Also has a floating capacity. Therefore, in order to maintain the balance between the characteristic impedance Z ₁₂ , the characteristic impedance Z ₂₃ , and the characteristic impedance Z ₃₁ and match these characteristic impedances with the characteristic impedances of the differential transmission circuit, the line segments in different laps are used. It is necessary to prevent the balance of the characteristic impedance between the coil conductors from being lost due to the influence of the floating capacitance. The stray capacitance between line segments in different orbits will be described with reference to FIGS. 9 and 10 in addition to FIG.

9 and 10 are schematic cross-sectional views corresponding to FIG. 8 of a conventional common mode choke coil. When three spiral coil conductors are arranged in a conventional common mode choke coil, each coil conductor is configured and arranged so as to be parallel to other coil conductors over the entire section thereof. When three coil conductors (coil conductor A1, coil conductor A2, and coil conductor A3 in FIGS. 9 and 10) are arranged in parallel with other coil conductors over the entire length thereof, the relative of each coil conductor even if the circumference changes. Arrangement is constant. That is, as shown in FIG. 9, the arrangement of the coil conductor A1, the coil conductor A2, and the coil conductor A3 is the same from the first lap to the fourth lap. In this case, even if each coil conductor is arranged so that the stray capacitances of the three coil conductors are equal in the same orbit, a large stray capacitance is generated between the coil conductors of the adjacent orbits. Stray capacitance is unevenly generated between the coil conductors. For example, in the example shown in FIG. 9, the coil conductor A3 on the first lap and the coil conductor A2 on the second lap are arranged adjacent to each other, and the coil conductor A1 on the first lap and the coil conductor A2 on the second lap are arranged adjacent to each other. Since the coil conductors A2 of the above are arranged adjacent to each other, a large stray capacitance is generated between these adjacently arranged conductors. As a result, the balance of stray capacitance between the coil conductors is lost. For example, in the example of FIG. 9, the floating capacitance between the coil conductor A1 on the first lap and the coil conductor A2 on the second lap and the coil conductor A3 on the first lap and the coil conductor A2 on the second lap Since the floating capacity between the two is large, the floating capacity generated between the coil conductor A1 and the coil conductor A2 and the floating capacity generated between the coil conductor A2 and the coil conductor A3 are the coil conductor A1 and the coil conductor A3. It will be larger than the floating capacity generated between and.

_{On the other hand, the distance D 23} between the coil conductor 33 on the first lap and the coil conductor 23 on the second lap in the common mode choke coil 1 according to the embodiment of the present invention is such that the coil conductor 23 is on the first lap. Since it is arranged closer to the outside and closer to the inner side in the second lap, the coil conductor A3 in the first lap and the coil conductor A2 in the second lap in the conventional common mode choke coil shown in FIG. 9 are arranged. The distance to and from D _23'is significantly larger. _{Similarly, the distance D 12} between the coil conductor 13 on the first lap and the coil conductor 23 on the second lap in the common mode choke coil 1 according to the embodiment of the present invention is the conventional common mode choke shown in FIG. The distance between the coil conductor A1 on the first lap and the coil conductor A2 on the second lap in the coil is significantly larger than _{the distance D 12'.} Therefore, in the common mode choke coil 1 according to the embodiment of the present invention, the floating capacitance between the coil conductor 13 on the first lap and the coil conductor 23 on the second lap and the coil conductor 33 on the first lap Since the floating capacitance with the coil conductor 23 on the second lap can be almost ignored, the balance of the floating capacitance generated between the coil conductors is not lost. That is, even if the influence of the floating capacitance due to the coil conductors in the adjacent circulation is taken into consideration, the floating capacitance C ₁₂ generated between the coil conductor 13 and the coil conductor 23 and the floating capacitance generated between the coil conductor 23 and the coil conductor 33 are generated. The floating capacitance C _{23 and the floating capacitance C 31} generated between the coil conductor 33 and the coil conductor 13 can be made substantially equal to each other (that is, C ₁₂ ≈ C ₂₃ ≈ C ₃₁ ). Therefore, according to the arrangement of the coil conductor 13, the coil conductor 23, and the coil conductor 33 described above, the balance of the characteristic impedance between the coil conductors can be maintained.

As shown in FIG. 10, by increasing the distance between adjacent laps, even while maintaining the arrangement of the conventional coil conductors shown in FIG. 9, due to the stray capacitance between the coil conductors in the other laps. It is possible to suppress the imbalance of stray capacitance between each coil conductor. For example, in the example shown in FIG. 10, the coil conductor A3 on the first lap and the coil conductor A2 on the second lap are provided by the amount that the distance between the first lap and the second lap is widened. The distance D _{23 ″ is longer than the corresponding distance D 23} ′ shown in FIG. 9, _{and the distance D 12} ″ between the coil conductor A1 on the first lap and the coil conductor A2 on the second lap. There is longer than the distance D ₁₂ 'corresponding shown in FIG. However, if the distance between adjacent laps is increased, the size of the common mode choke coil becomes large. In addition, by reducing the number of turns of each coil conductor, the balance of stray capacitance between each coil conductor is disturbed due to the stray capacitance between the coil conductors and the coil conductors in other circumferences while maintaining the conventional arrangement of the coil conductors. Can be suppressed. However, if the number of turns of the coil conductor is reduced, the common impedance becomes low, so that the common noise removal characteristic of the common mode choke coil deteriorates.

On the other hand, in the common mode choke coil 1 according to the embodiment of the present invention shown in FIG. 8, the coil conductor at the nth circumference is viewed in cross section in a plane cut by a plane including the coil shaft CA. Since the arrangement order of the 13, coil conductor 23, and coil conductor 33 from the inside in the radial direction is opposite to the arrangement order in the n + 1th lap, even if the distance between the coil conductors in the adjacent laps is shortened, the order is reversed. The floating capacitance generated between the coil conductors in the adjacent circuit can be reduced. _{For example, as shown in FIG. 8, the distance D 11} between the line segment of the first lap and the line segment of the second lap of the coil conductor 13 and the line segment and the second lap of the first lap of the coil conductor 33 of the distance D ₃₃ between the line segment, the distance L ₁₂ between the coil conductor 13 and the coil conductor 23 in the same orbiting distance L ₂₃ between the coil conductor 23 and the coil conductor 33, and the coil conductor 33 and the coil conductor 13 It can be shorter than any of the distances L _31.

As described above, the common mode choke coil 1 according to the embodiment of the present invention can balance the characteristic impedance between the three coil conductors without deteriorating the common noise removal characteristic. Further, since the characteristic impedances among the three coil conductors are balanced, the characteristic impedances between the coil conductors can be matched with the characteristic impedances of the differential transmission circuit.

Next, the common mode choke coil according to another embodiment of the present invention will be described with reference to FIGS. 11 to 16. FIG. 11 is an exploded perspective view of the common mode choke coil 101 according to another embodiment of the present invention. Among the components of the common mode choke coil 101 shown in FIG. 11, those that are the same as or similar to the components of the common mode choke coil 1 shown in FIG. 2 are designated by the same reference numerals as those in FIG. A detailed description of the components of the above will be omitted.

The common mode choke coil 101 shown in FIG. 11 includes a laminate 103 between the lower dummy insulating layer 2 and the upper dummy insulating layer 4. In one embodiment of the present invention, the laminated body 103 includes a lower magnetic layer 8, an upper magnetic layer 9, a first insulating layer 111 laminated between these magnetic layers, a first conductor layer 112, and a second. It includes an insulating layer 121, a second conductor layer 122, a third insulating layer 131, a third conductor layer 132, an insulating layer for an extraction electrode 41, an extraction conductor layer 42, and a cover insulating layer 51.

As shown, the first insulating layer 111 is formed on the lower magnetic layer 8. A first conductor layer 112 is formed on the first insulating layer 111. A second insulating layer 121 is formed on the first conductor layer 112. A second conductor layer 122 is formed on the second insulating layer 121. A third insulating layer 131 is formed on the second conductor layer 122. A third conductor layer 132 is formed on the third insulating layer 131.

Next, the first conductor layer 112 and the second conductor layer 122 will be described with reference to FIGS. 12 and 13. As shown in FIG. 13, the second conductor layer 122 is formed on the coil conductor 113, the drawer conductor 114 whose one end is connected to the outer end portion of the coil conductor 113, and the inner end portion of the coil conductor 113. An extraction conductor 115 to which one end thereof is connected and an extraction electrode 116 connected to the extraction conductor 114 are provided. The extraction electrode 116 is electrically connected to the terminal electrode 5a. The coil conductor 113 has a spiral shape in which the coil conductor 113 is wound a plurality of times around the coil shaft CA. The second conductor layer 122 further includes a coil conductor 123a2, a coil conductor 123b2, a coil conductor 123c2, a coil conductor 123d2, and a drawer conductor 124 whose one end is connected to the outer end portion of the coil conductor 123a2. A drawer conductor 125 having one end connected to the inner end of the coil conductor 123d2 and a drawer electrode 126 connected to the drawer conductor 124. The extraction electrode 126 is electrically connected to the terminal electrode 6a.

The second insulating layer 121 is provided with a plurality of through holes for connecting the conductors constituting the second conductor layer 122 to the conductors constituting the first conductor layer 112. Specifically, in the second insulating layer 121, a through hole TH321 is formed at the inner end of the coil conductor 123a2, a through hole TH322 is formed at the outer end of the coil conductor 123b2, and the inside of the coil conductor 123b2 is formed. Through hole TH323 is formed at the end, through hole TH324 is formed at the outer end of the coil conductor 123c2, through hole TH325 is formed at the inner end of the coil conductor 123c2, and the outer end of the coil conductor 123d2 is formed. A through hole TH326 is formed in the coil conductor, and a through hole TH327 is formed in the inner end of the coil conductor 123d2. Further, in the second insulating layer 121, a through hole TH328 is formed at the outer end portion of the lead conductor 125.

As shown in FIG. 12, the first insulating layer 111 includes a coil conductor 123a1, a coil conductor 123b1, a coil conductor 123c1, and a coil conductor 123d1. Further, the first insulating layer 111 is provided with a plurality of through holes for connecting these coil conductors with the corresponding conductors of the second conductor layer 122. Specifically, in the first insulating layer 111, the pad P311 is formed at the outer end of the coil conductor 123a1, the pad P312 is formed at the inner end of the coil conductor 123a1, and the outer end of the coil conductor 123b1 is formed. The pad P313 is formed in the coil conductor 123b1, the pad P314 is formed in the inner end portion of the coil conductor 123b1, the pad P315 is formed in the outer end portion of the coil conductor 123c1, and the pad P316 is formed in the inner end portion of the coil conductor 123c1. The pad P317 is formed at the outer end of the coil conductor 123d1, and the pad P318 is formed at the inner end of the coil conductor 123d1. The pads P311, P321, P313, P314, P315, P316, P317, and P318 are the through holes TH3211, TH322, TH323, TH324, and TH325 in the plan view of the common mode choke coil 101 seen from the axial direction of the coil shaft CA, respectively. It is formed at a position corresponding to TH326, TH327, and TH328. The through holes TH3211, TH322, TH323, TH324, TH325, TH326, TH327, and TH328 are formed by embedding a metal material such as Ag in the through holes formed in the second insulating layer 121.

The first insulating layer 111, the first conductor layer 112, the second insulating layer 121, and the second conductor layer 122 thus formed are the conductors constituting the first conductor layer 112 and the second conductor. The conductors constituting the conductor layer 122 are conducted through the pads P311, P321, P313, P314, P315, P316, P317, P318, and through holes TH321, TH322, TH323, TH324, TH325, TH326, TH327, and TH328. It is laminated like this. By laminating the first insulating layer 111, the first conductor layer 112, the second insulating layer 121, and the second conductor layer 122 in this way, the coil conductor 123a2 and the through hole TH321 in the coil conductor 123a2. The coil conductor 123a1 connected via the pad P311 and the coil conductor 123b2 connected to the coil conductor 123a1 via the pad P312 and the through hole TH322, and the coil conductor 123b2 via the through hole TH323 and the pad P313. The connected coil conductor 123b1, the coil conductor 123c2 connected to the coil conductor 123b1 via the pad P314 and the through hole TH324, and the coil conductor 123c1 connected to the coil conductor 123c2 via the through hole TH325 and the pad P315. The coil conductor 123d2 is connected to the coil conductor 123c1 via the pad P316 and the through hole TH326, and the coil conductor 123d1 is connected to the coil conductor 123d2 via the through hole TH327 and the pad P317. 123 is configured.

Further, in the laminated body in which the first insulating layer 111, the first conductor layer 112, the second insulating layer 121, and the second conductor layer 122 are laminated, the first conductor layer 112 and the second conductor The conductors constituting each of the layers 122 are arranged as shown in FIG. 14 in a plan view from the axial direction along the coil axis CA direction. FIG. 14 shows the first conductor layer 112 overlaid with the second conductor layer 122 in order to further explain the arrangement of the conductors constituting each of the first conductor layer 112 and the second conductor layer 122. It is a schematic plan view. In FIG. 14, the coil conductor 123a1, the coil conductor 123b1, the coil conductor 123c1, and the coil conductor 123d1 constituting the first conductor layer 112 are shown by broken lines, and each conductor forming the second conductor layer 122 is shown by a solid line. ing.

As shown in FIG. 14, the line segment of the coil conductor 113 and the line segment of the coil conductor 123 are formed in the first region R1 when the common mode choke coil 101 is viewed in a plan view from the axial direction along the coil axis CA. It is configured and arranged so as to extend parallel to each other. On the other hand, the line segment of the coil conductor 113 and the line segment of the coil conductor 123 are configured and arranged so as to intersect each other in the second region R2 when the common mode choke coil 101 is viewed in a plan view. The arrangement of the lines of the coil conductor 113 and the lines of the coil conductor 123 when the common mode choke coil 101 is viewed from the axial direction along the coil axis CA is generally the arrangement of the coil conductor 13 and the coil conductor 23 shown in FIG. Is similar to. That is, in the line segment of the coil conductor 113 and in the first circumference of the coil conductor 123, in the first region R1 before entering the second region R2, the coil conductor 123 is outside the coil conductor 113 in a plan view. Is located in. In the second region R2, the parallel arrangement of the coil conductor 113 and the coil conductor 123 is broken, and they intersect so that the coil conductor 123 enters the inside while the coil conductor 113 exits the outside. Similarly, the coil conductor 113 and the coil conductor 123 are changed from the inner lane to the outer lane or from the outer lane to the inner lane each time the circuit is repeated, and the inside of the drawer conductor 115 is changed. It extends to the end and the inner end of the lead conductor 125.

As described above, a third insulating layer 131 is formed on the second conductor layer 122. A third conductor layer 132 is formed on the third insulating layer 131. The configuration of the third conductor layer 132 will be described with reference to FIG. As shown in the figure, the third conductor layer 132 includes a spiral-shaped coil conductor 133, a drawer conductor 134 whose one end is connected to the outer end of the coil conductor 133, and an inner end of the coil conductor 133. A lead conductor 135 to which one end thereof is connected to the lead conductor 135, and a lead electrode 136 connected to the lead conductor 134. The extraction electrode 136 is electrically connected to the terminal electrode 7a. The coil guide 1 body 33 has a spiral shape in which the coil shaft CA is wound a plurality of times. An insulating layer 41 for an extraction electrode is formed on the third conductor layer 132.

A pad P117 is formed on the second insulating layer 121 and a through through the third insulating layer 131 in order to connect the end of the lead conductor 115 of the second conductor layer 112 and the end of the lead conductor 43a. The hole TH137 is formed, and the through hole TH47 is formed in the lead electrode insulating layer 41. The through holes TH137 and TH47 are formed by embedding a metal material such as Ag in the through holes formed in the second insulating layer 121, the third insulating layer 131, and the insulating layer 41 for the extraction electrode. A pad P128 is formed on the second insulating layer 121 and a through through the third insulating layer 131 in order to connect the end of the lead conductor 125 of the second conductor layer 122 and the end of the lead conductor 43b. Hole TH138 is formed, and through hole TH48 is formed in the lead electrode insulating layer 41. In order to connect the end of the lead conductor 135 of the third conductor layer 132 and the end of the lead conductor 43c, a pad P139 is formed on the third insulating layer 131, and a through is formed on the lead electrode insulating layer 41. Hall TH49 is formed. Each of these through holes is formed in the same manner as through holes TH137.

With the above configuration and arrangement, in the common mode choke coil 101, three coils are provided between the terminal electrodes 5a, 6a, 7a and the terminal electrodes 5b, 6b, 7b. That is, the outer end of the coil conductor 113 is electrically connected to the terminal electrode 5a via the extraction conductor 114 and the extraction electrode 116, and the inner end of the coil conductor 113 is the extraction conductor 115, the pad P117, the through hole TH137, and the through. Since it is electrically connected to the terminal electrode 5b via the hole TH47, the extraction conductor 43a, and the extraction electrode 44a, a first coil including the coil conductor 113 is formed between the terminal electrode 5a and the terminal electrode 5b. Will be done. Further, the outer end of the coil conductor 123 is electrically connected to the terminal electrode 6a via the extraction conductor 124 and the extraction electrode 126, and the inner end of the coil conductor 123 is the extraction conductor 125, the pad P128, the through hole TH138, and the through. Since it is electrically connected to the terminal electrode 6b via the hole TH48, the extraction conductor 43b, and the extraction electrode 44b, a second coil including the coil conductor 123 is formed between the terminal electrode 6a and the terminal electrode 6b. Will be done. Further, the outer end of the coil conductor 133 is electrically connected to the terminal electrode 7a via the extraction conductor 134 and the extraction electrode 136, and the inner end of the coil conductor 133 is the extraction conductor 135, the pad P139, the through hole TH49, and the drawer. Since it is electrically connected to the terminal electrode 7b via the conductor 43c and the extraction electrode 44c, a third coil including the coil conductor 133 is formed between the terminal electrode 7a and the terminal electrode 7b. Each of these three coils is a planar coil formed on a plane.

The above-mentioned common mode choke coil 101 can be produced in the same manner as the common mode choke coil 1.

Next, the arrangement of the coil conductor 113, the coil conductor 123, and the coil conductor 133 will be further described with reference to FIG. FIG. 16 is a cross-sectional view schematically showing a cross section of the common mode choke coil 101 cut along a plane including the coil shaft CA (for example, a cross section cut along the line BB shown in FIGS. 13 and 15).

As described with reference to FIG. 14, the coil conductor 123 (coil conductor 123a2) is arranged outside the coil conductor 113 before passing through the second region R2 in the first round. In the second lap, this arrangement is replaced, and the coil conductor 113 is arranged outside the coil conductor 123 (coil conductor 123b2). The coil conductor 133 is arranged between the coil conductor 113 and the coil conductor 123. In other words, when viewed in cross section in a cross section cut by a plane including the coil shaft CA, the arrangement order of the coil conductor 113, the coil conductor 123, and the coil conductor 133 from the inside in the radial direction at the nth circumference is the n + 1th. The order is reversed on the lap. That is, in the first lap, the coil conductor 113, the coil conductor 133, and the coil conductor 123 are arranged in this order from the inside in the radial direction, but in the second lap, the coil conductor 123, the coil conductor 133, and the coil are arranged in this order. The conductors 113 are arranged in this order. This arrangement is further replaced in the third lap and further replaced in the fourth lap. As a result, the arrangement of the first lap and the second lap of each coil conductor is plane symmetric with respect to the virtual plane VS1 passing between the first lap and the second lap. .. Similarly, the arrangement of the second lap and the third lap of each coil conductor is plane symmetric with respect to the virtual plane VS2 passing between the second lap and the third lap, and the third lap. The arrangement of the eyes and the arrangement of the fourth lap are plane symmetric with respect to the virtual plane VS3 passing between the third lap and the fourth lap.

In one embodiment of the present invention, the coil conductor 113, the coil conductor 123, and the coil conductor 133 have a floating capacitance generated between the coil conductor 113 and the coil conductor 123 in the first region R1, and the coil conductor 123 and the coil. The floating capacitance generated between the conductor 133 and the floating capacitance generated between the coil conductor 133 and the coil conductor 113 are arranged to be equal to each other.

In the above-mentioned common mode choke coil 101, the coil conductor 113, the coil conductor 133, and the coil conductor 123 are arranged from the inside in the radial direction at the nth circumference when viewed in cross section in a cross section cut by a plane including the coil shaft CA. Since the order is opposite to the order in the n + 1th lap, the same coil conductors can be arranged at the shortest distance in the adjacent laps. Therefore, compared to the conventional common mode choke coil in which the distance between different coil conductors is the shortest in the adjacent orbits, the stray capacitance generated between the coil conductors in the adjacent orbits causes the floating between the coil conductors. It is possible to suppress the bias of capacitance.

Further, in the common mode choke coil 101, the coil conductor 113, the coil conductor 133, and the coil conductor 123 are arranged from the inside in the radial direction at the nth circumference when viewed in cross section in a cross section cut by a plane including the coil shaft CA. Since the order is opposite to the order in the n + 1th lap, even if the distance between the coil conductors in the adjacent laps is shortened, the floating capacitance generated between the coil conductors in the adjacent laps can be reduced. it can. Therefore, in the common mode choke coil 101, the characteristic impedance between the three coil conductors can be balanced without deteriorating the common noise removal characteristic.

Next, the common mode choke coil according to another embodiment of the present invention will be described with reference to FIGS. 17 and 18. FIG. 17 is an exploded perspective view of the common mode choke coil 201 according to another embodiment of the present invention. Among the components of the common mode choke coil 201 shown in FIG. 17, those that are the same as or similar to the components of the common mode choke coil 1 shown in FIG. 2 are designated by the same reference numerals as those in FIG. Detailed description of similar components will be omitted.

The common mode choke coil 201 shown in FIG. 17 includes a laminate 203 between the lower dummy insulating layer 2 and the upper dummy insulating layer 4. In one embodiment of the present invention, the laminate 203 includes a lower magnetic layer 8, an upper magnetic layer 9, a first coil unit U1, a second coil unit U2, and a cover insulating layer 51.

As shown, the first coil unit U1 is formed on the lower magnetic layer 8. The first coil unit U1 includes a first insulating layer 11, a first conductor layer 12, a second insulating layer 21, a second conductor layer 22, a third insulating layer 31, and a third conductor layer. 32 is provided. The first insulating layer 11, the first conductor layer 12, the second insulating layer 21, the second conductor layer 22, the third insulating layer 31, and the third conductor layer 32 are shown in FIG. It is configured in the same manner as the common mode choke coil 1.

The second coil unit U2 is formed on the first coil unit U1. The second coil unit U2 has a fourth insulating layer 211, a fourth conductor layer 212, a fifth insulating layer 221, a fifth conductor layer 222, a sixth insulating layer 231 and a third in order from the bottom. The conductor layer 232 of 6 is provided. The fourth insulating layer 211 and the fourth conductor layer 212 formed on the fourth insulating layer 211 are configured in the same manner as the third insulating layer 31 and the third conductor layer 32 formed on the third insulating layer 31, respectively. The insulating layer 221 and the fifth conductor layer 222 formed on the insulating layer 221 are configured in the same manner as the second insulating layer 21 and the second conductor layer 22 formed on the second insulating layer 21, respectively, and the sixth insulating layer 231 is formed. And the sixth conductor layer 232 formed on the first insulating layer 232 are configured in the same manner as the first insulating layer 11 and the first conductor layer 12 formed on the first insulating layer 11, respectively. More specifically, the fourth conductor layer 212 includes a spiral-shaped coil conductor 213, a drawer conductor 214 whose one end is connected to the outer end of the coil conductor 213, and an inner end of the coil conductor 213. A lead conductor 215 having one end connected to the portion and a lead electrode 216 connected to the lead conductor 214 are provided. The extraction electrode 216 is electrically connected to the terminal electrode 7b. The fifth conductor layer 222 includes a spiral-shaped coil conductor 223, a drawer conductor 224 whose one end is connected to the outer end of the coil conductor 223, and one end thereof to the inner end of the coil conductor 223. The lead conductor 225 is connected to the lead conductor 225, and the lead electrode 226 is connected to the lead conductor 224. The extraction electrode 226 is electrically connected to the terminal electrode 6b. Further, the sixth conductor layer 232 includes a spiral-shaped coil conductor 233, a drawer conductor 234 whose one end is connected to the outer end of the coil conductor 233, and one end thereof to the inner end of the coil conductor 233. The lead conductor 235 is connected to the lead conductor 235, and the lead electrode 236 is connected to the lead conductor 234. The extraction electrode 236 is electrically connected to the terminal electrode 5b. The coil conductor 213 is formed in the same shape as the coil conductor 33 in a plan view, and is arranged at a position overlapping the coil conductor 33. Further, the coil conductor 223 is formed in the same shape as the coil conductor 23 in a plan view, and is arranged at a position overlapping the coil conductor 23. Further, the coil conductor 233 is formed in the same shape as the coil conductor 13 in a plan view, and is arranged at a position overlapping the coil conductor 13.

Through holes TH217 and through holes TH218 and TH219 are formed in the fourth insulating layer 211, through holes TH227 and TH228 are formed in the fifth insulating layer 221 and through holes TH217 and TH228 are formed in the sixth insulating layer 231. TH237 is formed. Each of these through holes is formed in the same manner as through holes TH27.

With the above configuration and arrangement, in the common mode choke coil 201, three coils are provided between the terminal electrodes 5a, 6a, 7a and the terminal electrodes 5b, 6b, 7b. That is, between the terminal electrode 5a and the terminal electrode 5b, the extraction electrode 16, the extraction conductor 14, the coil conductor 13, the extraction conductor 15, the pad P17, the through hole TH27, TH37, TH217, TH227, TH237, and the extraction conductor 235, A first coil composed of a coil conductor 233, an extraction conductor 234, and an extraction electrode 236 is formed. Further, between the terminal electrode 6a and the terminal electrode 6b, an extraction electrode 26, an extraction conductor 24, a coil conductor 23, an extraction conductor 25, a pad P28, a through hole TH38, TH218, TH228, an extraction conductor 225, a coil conductor 223, A second coil consisting of a lead conductor 224 and a lead electrode 226 is formed. Further, between the terminal electrode 7a and the terminal electrode 7b, an extraction electrode 36, an extraction conductor 34, a coil conductor 33, an extraction conductor 35, a pad P39, a through hole TH219, an extraction conductor 215, a coil conductor 213, an extraction conductor 214, And a third coil consisting of the extraction electrode 216 is formed.

The above-mentioned common mode choke coil 201 is produced in the same manner as the common mode choke coil 1.

Next, the arrangement of the coil conductor 13, the coil conductor 23, the coil conductor 33, the coil conductor 213, the coil conductor 223, and the coil conductor 233 will be further described with reference to FIG. FIG. 18 schematically shows a cross section of the common mode choke coil 201 cut in a plane including the coil shaft CA in the first region R1 (for example, a cross section cut along a plane corresponding to the line AA shown in FIG. 3). It is sectional drawing shown in. The arrangement of each coil conductor in the coil unit U1 is the same as the arrangement of each coil conductor shown in FIG. That is, when viewed in cross section in a cross section cut by a plane including the coil shaft CA, the arrangement order of the coil conductor 13, the coil conductor 23, and the coil conductor 33 from the radial inside in the nth lap is the n + 1th lap. It is the reverse of the order in. For example, in the first lap, the coil conductor 13 (or the coil conductor 33) and the coil conductor 23 are arranged in this order from the inside in the radial direction, but in the second lap, the coil conductor 23 and the coil conductor 13 are arranged in the opposite order. (Or coil conductor 33) are arranged in this order. Similarly, in the coil unit U2, when viewed in cross section in a cross section cut by a plane including the coil shaft CA, the coil conductor 213, the coil conductor 223, and the coil conductor 233 at the nth circumference are viewed from the inside in the radial direction. The arrangement order is the reverse of the arrangement order in the n + 1th lap. For example, in the first lap, the coil conductor 213 (or coil conductor 233) and the coil conductor 223 are arranged in this order from the inside in the radial direction, but in the second lap, the coil conductor 223 and the coil conductor 213 are arranged in the opposite order. (Or coil conductor 233) are arranged in this order.

In the above-mentioned common mode choke coil 201, the coil conductor 213, the coil conductor 223, and the coil conductor 233 are arranged from the inside in the radial direction in the nth circumference when viewed in cross section in a cross section cut by a plane including the coil shaft CA. Since the order is opposite to the order in the n + 1th lap, the same coil conductors can be arranged at the shortest distance in the adjacent laps. Therefore, compared to the conventional common mode choke coil in which the distance between different coil conductors is the shortest in the adjacent orbits, the stray capacitance generated between the coil conductors in the adjacent orbits causes the floating between the coil conductors. It is possible to suppress the bias of capacitance.

Further, in the common mode choke coil 201 according to the embodiment of the present invention, the arrangement of each coil conductor included in the coil unit U1 and the coil unit U2 when viewed in cross section in a cross section cut by a plane including the coil shaft CA. The arrangement of each coil conductor included in the above is plane symmetric with respect to the virtual plane VS4 passing between the coil unit U1 and the coil unit U2. That is, the coil conductor 213 of the coil unit U2 is arranged at a position symmetrical with respect to the virtual plane VS4 with the coil conductor 33 to which the coil conductor 213 is electrically connected among the coil conductors constituting the coil unit U1. The coil conductor 223 of the coil unit U2 is arranged at a position symmetrical with respect to the virtual plane VS4 with the coil conductor 23 to which the coil conductor 223 is electrically connected among the coil conductors constituting the coil unit U1. The coil conductor 233 of the coil unit U2 is arranged at a position symmetrical with respect to the virtual plane VS4 and the coil conductor 13 to which the coil conductor 233 is electrically connected among the coil conductors constituting the coil unit U1. .. The virtual plane VS4 is located between the coil unit U1 and the coil unit U2, and is a virtual plane extending in a direction perpendicular to the coil axis CA (or extending in a direction parallel to each insulating layer such as the insulating layer 11). In other words, in the common mode choke coil 201 according to the embodiment of the present invention, the coil conductors constituting the first coil conductor (that is, that is, when viewed in cross section in a cross section cut by a plane including the coil shaft CA (that is,). Coil conductor 13 and coil conductor 233), coil conductors that make up the second coil conductor (ie, coil conductor 23 and coil conductor 223), and coil conductors that make up the third coil conductor (ie, coil conductor 33 and coil). The arrangement order of the conductor 213) along the coil axis CA direction is reversed between the coil unit U1 and the coil unit U2. That is, in the coil unit U1, the coil conductor 13 of the first coil conductor, the coil conductor 23 of the second coil conductor, and the coil conductor 33 of the third coil conductor are arranged in this order from the lower side in the coil axis CA direction. On the contrary, in the coil unit U2, from the lower side in the direction of the coil axis CA, the coil conductor 213 of the third coil conductor, the coil conductor 223 of the second coil conductor, and the coil conductor 233 of the first coil conductor. They are lined up in order.

In this way, the coil conductors that make up the first coil conductor, the coil conductors that make up the second coil conductor, and the coil conductors that make up the third coil conductor are arranged in the coil axis CA direction of the coil unit. Since the U1 and the coil unit U2 are reversed, the same coil conductors can be arranged at the shortest distance in the coil units adjacent to each other in the stacking direction. Therefore, it is possible to suppress the bias of the stray capacitance between the coil conductors due to the stray capacitance generated between the coil units adjacent to each other in the stacking direction. Further, even if the distance between the coil conductors between the coil units U1 and the coil units U2 adjacent to each other in the coil shaft CA direction (for example, the distance D ₃₃ between the coil conductor 33 and the coil conductor 213) is shortened, the coil shaft The floating capacitance generated between the coil conductors in each adjacent coil unit in the CA direction can be reduced.

In addition to the coil unit U1 and the coil unit U2, another coil unit may be additionally provided. For example, an additional coil unit configured similar to the coil unit U1 can be prepared and the additional coil unit can be arranged adjacent to the coil unit U2 in the coil axis CA direction. In this case, the additional coil unit is provided adjacent to the coil unit U2 and on the opposite side of the coil unit U1.

Various modifications can be applied to each of the coil units stacked in the coil axis CA direction. For example, the first insulating layer 111, the first conductor layer 112, the second insulating layer 121, the second conductor layer 122, the third insulating layer 131, and the third conductor in the embodiment shown in FIG. A plurality of coil units may be configured to include the layer 132. The plurality of coil units configured in this way are arranged so as to be adjacent to each other in the coil axis CA direction. Further, the plurality of coil units are arranged so that the arrangement of each coil conductor included in each coil unit is plane-symmetric with respect to a virtual plane passing between the plurality of coil units.

As described above, in the common mode choke coil according to various embodiments of the present invention, the characteristic impedance between the three coil conductors can be balanced without deteriorating the common noise removal characteristic. Further, since the characteristic impedances among the three coil conductors are balanced, the characteristic impedances between the coil conductors can be matched with the characteristic impedances of the differential transmission circuit.

The dimensions, materials, and arrangement of each component described herein are not limited to those expressly described in the embodiments, and each component may be included within the scope of the present invention. Can be transformed to have the dimensions, materials, and arrangement of. In addition, components not explicitly described in the present specification may be added to the described embodiments, or some of the components described in each embodiment may be omitted.

1,101,201 Common mode choke coil 3,103,203 Laminated body 5a, 5b, 6a, 6b, 7a, 7b Terminal electrode 11,111 First insulating layer 21,121 Second insulating layer 31,131 Third Insulation layer 12,112 First conductor layer 22,122 Second conductor layer 32,132 Third conductor layer 211 Fourth insulation layer 221 Fifth insulation layer 231 Sixth insulation layer 212 Fourth conductor Layer 222 Fifth conductor layer 232 Sixth conductor layer 13,23,33,113,123,133,213,223,233 Coil conductor U1, U2 Coil unit

Claims (25)

A first coil conductor provided on the first coil forming surface in the first insulator and wound around a coil shaft,
A second coil conductor provided on the second coil forming surface in the first insulator and wound around the coil shaft, and a second coil conductor.
A third coil conductor provided on the third coil forming surface in the first insulator and wound around the coil shaft is provided.
The second coil conductor is formed in a shape different from that of the first coil conductor and the third coil conductor.
In the first region in a plan view along the coil axis seen from the axial direction, the first coil conductor, the second coil conductor, and the third coil conductor extend in parallel with each other. ,
The nth circumference of the first coil conductor, the second coil conductor, and the third coil conductor when cross-sectionally viewed in a cross section cut by a plane including the coil shaft in the first region. The order of arrangement from the inside in the radial direction is opposite to that of the n + 1th lap.
Common mode choke coil.
(However, n is an arbitrary natural number in which n + 1 does not exceed any of the number of turns of the first coil conductor, the number of turns of the second coil conductor, and the number of turns of the third coil conductor.) The common mode choke coil according to claim 1, wherein the third coil conductor and the first coil conductor are formed in the same shape in a plan view when viewed from the axial direction. In the first region, the line segment on the n + 1th lap of the first coil conductor, the line segment on the n + 1th lap of the second coil conductor, and the line segment on the n + 1th lap of the third coil conductor. The line segment is the first line segment with respect to the first virtual plane extending parallel to the coil axis through the midpoint between the line segment on the nth circumference and the line segment on the n + 1th circumference of the first coil conductor. It is provided plane-symmetrically with the nth line segment of the coil conductor 1, the nth line segment of the second coil conductor, and the nth line segment of the third coil conductor. , The common mode choke coil according to claim 1 or 2. In the first region, the floating capacitance generated between the nth peripheral line segment of the first coil conductor and the nth circumferential linear segment of the second coil conductor, the first coil. The floating capacitance generated between the nth circumference of the conductor and the nth circumference of the third coil conductor, and the nth circumference of the second coil conductor and the above. The common mode choke coil according to any one of claims 1 to 3, wherein the floating capacitance generated between the third coil conductor and the line segment on the nth circumference is equal to each other. The common mode choke coil according to any one of claims 1 to 4, wherein the first coil forming surface, the second coil forming surface, and the third coil forming surface are different surfaces from each other. A claim that the first coil forming surface and the second coil forming surface, the second coil forming surface and the third coil forming surface, or the third coil forming and the first coil forming surface are the same surfaces. The common mode choke coil according to any one of claims 1 to 4. The first coil conductor, the second coil conductor, and the third coil conductor are other coils in the plan view seen from the axial direction in the second region in the plan view seen from the axial direction. The common according to any one of claims 1 to 6, which is provided so as to intersect at least one of the conductors and not to intersect with each other in a cross-sectional view cut by a plane including the coil shaft. Mode choke coil. The nth line segment of the first coil conductor, the nth line segment of the second coil conductor, and the nth line segment of the third coil conductor are all described above. The common mode choke coil according to claim 7, wherein the length in the first region is longer than the length in the second region. The innermost line segment of the first coil conductor, the second coil conductor, and the third coil conductor on the nth circumference, the first coil conductor, and the second coil. The distance between the conductor and the outermost line segment of the third coil conductor on the n + 1th circumference is the distance between the first coil conductor and the second coil conductor in the first region. Of the distance between the second coil conductor and the third coil conductor in the first region, and the distance between the third coil conductor and the first coil conductor in the first region. The common mode choke coil according to any one of claims 1 to 8, which is shorter than any of the above. A first coil unit including the first coil conductor, the second coil conductor, and the third coil conductor, and a second coil unit provided so as to face the first coil unit. Prepare,
The second coil unit is
A fourth coil conductor provided on the fourth coil forming surface in the second insulator and wound around the coil shaft, and a fourth coil conductor.
A fifth coil conductor provided on the fifth coil forming surface in the second insulator and wound around the coil shaft, and a fifth coil conductor.
A sixth coil conductor provided on the sixth coil forming surface in the second insulator and wound around the coil shaft, and a sixth coil conductor.
Including
The sixth coil conductor is electrically connected to the first coil conductor.
The fifth coil conductor is electrically connected to the second coil conductor.
The fourth coil conductor is electrically connected to the third coil conductor.
In the second coil unit, the sixth coil conductor is the first with respect to a second virtual plane perpendicular to the coil axis between the first coil unit and the second coil unit. The fifth coil conductor is plane symmetric with the second coil conductor, and the fourth coil conductor is plane symmetric with the third coil conductor. The common mode choke coil according to any one of claims 1 to 9, which is configured. A first coil unit including the first coil conductor, the second coil conductor, and the third coil conductor, and a second coil unit provided so as to face the first coil unit. Prepare,
The second coil unit is
A fourth coil conductor provided on the fourth coil forming surface in the second insulator and wound around the coil shaft, and a fourth coil conductor.
A fifth coil conductor wound around said coil shaft provided on the fifth coil forming surface of the second insulating body,
A sixth coil conductor provided on the sixth coil forming surface in the second insulator and wound around the coil shaft, and a sixth coil conductor.
Including
The sixth coil conductor is electrically connected to the first coil conductor.
The fifth coil conductor is electrically connected to the second coil conductor.
The fourth coil conductor is electrically connected to the third coil conductor.
The second coil unit has the fourth coil conductor, the fifth coil conductor, and the nth circumference of the sixth coil conductor when viewed in cross section in a cross section cut along a plane including the coil shaft. The common mode choke coil according to any one of claims 1 to 9, wherein the arrangement order from the inside in the radial direction in the eyes is opposite to that of the n + 1th lap. Among the first coil conductor, the second coil conductor, and the third coil conductor, the one arranged closest to the second coil unit, the fourth coil conductor, and the fifth coil conductor. The distance between the coil conductor and the sixth coil conductor arranged closest to the first coil unit is the distance between the first coil conductor and the second coil conductor in the first region. The distance between the second coil conductor and the third coil conductor in the first region, and the distance between the third coil conductor and the first coil conductor in the first region. The common mode choke coil according to claim 10 or 11, which is shorter than any of the above. The first terminal electrode and
The second terminal electrode and
With the third terminal electrode,
With the 4th terminal electrode
With the fifth terminal electrode,
6th terminal electrode and
With more
The first coil conductor is provided between the second terminal electrode and the first terminal electrodes,
The second coil conductor is provided between the third terminal electrode and the fourth terminal electrodes,
It said third coil conductor is provided between the sixth terminal electrode and said fifth terminal electrode,
Common mode choke coil according to any one of claims 1 to 12. The first terminal electrode and
The second terminal electrode and
With the third terminal electrode,
With the 4th terminal electrode
With the fifth terminal electrode,
6th terminal electrode and
With more
It said first coil conductor and the coil conductor of the sixth is provided between the first terminal electrode and the second terminal electrodes,
The second coil conductor and the fifth coil conductor is provided between the third terminal electrode and the fourth terminal electrodes,
Said third coil conductor and the fourth coil conductor between the fifth terminal electrode and the sixth terminal electrodes of the are provided,
The common mode choke coil according to any one of claims 10 to 12. The common mode choke coil according to any one of claims 1 to 14, wherein the first insulator is made of a non-magnetic material. The common mode choke coil according to any one of claims 10 to 12, wherein the second insulator is made of a non-magnetic material. The common mode choke coil according to claim 15, wherein the first insulator is a resin or a dielectric ceramic. The common mode choke coil according to claim 16, wherein the second insulator is a resin or a dielectric ceramic. An insulating upper dummy layer provided on the upper part of the first insulator and an insulating lower dummy layer provided on the lower part of the first insulator are further provided.
The common mode choke coil according to any one of claims 1 to 9, wherein the upper dummy layer and the lower dummy layer are made of a magnetic material. An insulating upper dummy layer provided on the upper part of the first insulator and an insulating lower dummy layer provided on the lower part of the second insulator are further provided.
The common mode choke coil according to any one of claims 10 to 12 , 16 , and 18 , wherein the upper dummy layer and the lower dummy layer are made of a magnetic material. The common mode choke coil according to claim 19 or 20, wherein the magnetic material is Ni—Zn—Cu based ferrite. Further provided with a magnetic core connecting the upper dummy layer and the lower dummy layer,
The common mode choke coil according to claim 19 or 21, wherein the first coil conductor, the second coil conductor, and the third coil conductor are wound around the magnetic core. Further provided with a magnetic core connecting the upper dummy layer and the lower dummy layer,
The first coil conductor, the second coil conductor, the third coil conductor, the fourth coil conductor, the fifth coil conductor, and the sixth coil conductor are all around the magnetic core. The common mode choke coil according to claim 20, which is wound. The common mode choke coil according to claim 23, wherein the magnetic material is Ni—Zn—Cu based ferrite. A first coil conductor provided on the first coil forming surface in the insulator and wound around a coil shaft,
A second coil conductor provided on the second coil forming surface in the insulator and wound around the coil shaft,
A third coil conductor provided on the third coil forming surface in the insulator and wound around the coil shaft,
With
The second coil conductor is formed in a shape different from that of the first coil conductor and the third coil conductor.
In the first region in a plan view along the coil axis seen from the axial direction, the first coil conductor, the second coil conductor, and the third coil conductor extend in parallel with each other. ,
In the first region, the line segment on the n + 1th lap of the first coil conductor, the line segment on the n + 1th lap of the second coil conductor, and the line segment on the n + 1th lap of the third coil conductor. The line segment is the first coil with respect to a virtual plane extending parallel to the coil axis through the midpoint between the line segment on the nth circumference and the line segment on the n + 1th circumference of the first coil conductor. The line segment on the nth circumference of the conductor, the line segment on the nth circumference of the second coil conductor, and the line segment on the nth circumference of the third coil conductor are provided plane-symmetrically.
Common mode choke coil.
(However, n is an arbitrary natural number in which n + 1 does not exceed any of the number of turns of the first coil conductor, the number of turns of the second coil conductor, and the number of turns of the third coil conductor.)

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