WO2020255593A1 - Common-mode choke coil - Google Patents

Common-mode choke coil Download PDF

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Publication number
WO2020255593A1
WO2020255593A1 PCT/JP2020/019152 JP2020019152W WO2020255593A1 WO 2020255593 A1 WO2020255593 A1 WO 2020255593A1 JP 2020019152 W JP2020019152 W JP 2020019152W WO 2020255593 A1 WO2020255593 A1 WO 2020255593A1
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WIPO (PCT)
Prior art keywords
region
choke coil
mode choke
thickness
pair
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PCT/JP2020/019152
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French (fr)
Japanese (ja)
Inventor
祐二 安岡
知宏 藤田
将浩 平賀
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パナソニックＩｐマネジメント株式会社
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Priority to JP2021527457A priority Critical patent/JPWO2020255593A1/ja
Publication of WO2020255593A1 publication Critical patent/WO2020255593A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances

Definitions

  • the present disclosure relates to a common mode choke coil provided with a core and a wire, and particularly to a common mode choke coil suitable for use in a common mode filter for removing noise.
  • Such a conventional common mode choke coil has a ferrite magnetic core in which flanges are formed on both sides of the winding core, and a plurality of turns wound on the winding core of the magnetic core by a bifilar winding or the like for several turns to several tens of turns. It is composed of a wire made of an insulating coated copper wire, a flange portion provided on both of the magnetic core having a magnetic permeability substantially the same as that of the magnetic core, and a magnetic plate arranged on the collar portion.
  • the magnetic core and the magnetic plate are obtained by mixing a binder with ferrite powder, press-molding, and firing this.
  • a plurality of electrodes are formed on both flanges or one flange, and the end of the wire winding start and the end of the winding end are conductively connected to these electrodes by soldering, thermocompression bonding, etc., respectively. Has been done. Then, in such a common mode choke coil, a desired impedance value is obtained by appropriately setting the number of windings of the wire wound around the core of the core.
  • Patent Document 1 As the prior art document information related to the invention of this application, for example, Patent Document 1 is known.
  • the invention according to the present disclosure has the following configurations in order to solve the above problems.
  • the common mode choke coil of the present disclosure includes a magnetic core, a pair of external electrodes, two windings, and a magnetic plate.
  • the magnetic core has a winding core portion and a pair of collar portions.
  • the winding core portion has a columnar shape extending in the first direction.
  • Each of the pair of collar portions is provided at both ends of the winding core portion.
  • Each of the pair of collars is provided with a main surface and a mounting surface.
  • a pair of external electrodes are provided on each of the pair of collar portions.
  • the two windings are wound around the core.
  • the magnetic plate is joined to the surface of the pair of collars opposite to the mounting surface. One end of each of the two windings is joined to one of a pair of external electrodes provided on one of the pair of collars.
  • each of the two windings is joined to the other of a pair of external electrodes provided on the other of the pair of collars.
  • the main surface of each of the pair of collars has a central region and a peripheral region.
  • the central region is a region in contact with the core portion.
  • the peripheral area is an area arranged around the central area.
  • the peripheral region has a first region and a second region.
  • the first region is in contact with the central region and extends from the central region toward the mounting surface.
  • the second region is adjacent to the first region. Further, the second region extends in the front direction from the central region when viewed from the mounting surface.
  • the thickness of the first region in the first direction is thinner than the thickness of the second region.
  • the common mode choke coil of the first aspect of the present disclosure includes a magnetic core, a pair of external electrodes, two windings, and a magnetic plate.
  • the magnetic core has a winding core portion and a pair of collar portions.
  • the winding core portion has a columnar shape extending in the first direction.
  • Each of the pair of collar portions is provided at both ends of the winding core portion.
  • Each of the pair of collars is provided with a main surface and a mounting surface.
  • a pair of external electrodes are provided on each of the pair of collar portions.
  • the two windings are wound around the core.
  • the magnetic plate is joined to the surface of the pair of collars opposite to the mounting surface.
  • each of the two windings is joined to one of a pair of external electrodes provided on one of the pair of collars.
  • the other end of each of the two windings is joined to the other of a pair of external electrodes provided on the other of the pair of collars.
  • the main surface of each of the pair of collars has a central region and a peripheral region.
  • the central region is a region in contact with the core portion.
  • the peripheral area is an area arranged around the central area.
  • the peripheral region has a first region and a second region.
  • the first region is in contact with the central region and extends from the central region toward the mounting surface.
  • the second region is adjacent to the first region. Further, the second region extends in the front direction from the central region when viewed from the mounting surface.
  • the thickness of the first region in the first direction is thinner than the thickness of the second region.
  • the thickness of the collar portion in the first region is set to be larger than the thickness of the collar portion in the second region by providing a recess in the first region for the first aspect. Also thin.
  • the winding wire is obtained by subtracting the thickness of the collar portion in the first region from the thickness of the collar portion in the second region in the second aspect. It is set to be at least half the diameter and at least half the thickness of the collar in the second region.
  • the winding wire is obtained by subtracting the thickness of the collar portion in the first region from the thickness of the collar portion in the second region in the third aspect. It is set to be equal to or larger than the diameter and less than a quarter of the thickness in the second region of the collar.
  • the recess of the second aspect has a tapered shape in which the thickness of the collar portion in the first region becomes thinner as the distance from the winding core portion increases.
  • the common mode choke coil of the sixth aspect of the present disclosure includes a side forming a peripheral region and the side surface of the winding core portion is a flat surface for the first aspect, and the angle formed by the flat surface and the second region is 90 degrees. Is.
  • FIG. 1 is a side view of the common mode choke coil according to the embodiment of the present disclosure.
  • FIG. 2 is a schematic cross-sectional view taken along line II-II of the common mode choke coil of FIG.
  • FIG. 3 is a side view of a magnetic core used in the common mode choke coil of the embodiment of the present disclosure.
  • FIG. 4 is a diagram showing the main surface of the collar portion of the magnetic core in FIG.
  • FIG. 5 is a partially enlarged perspective view of the magnetic core shown in FIG.
  • the magnetic core 11 is composed of a winding core portion 12 having a square pillar shape and a pair of flange portions 13 provided at both ends of the winding core portion 12.
  • the winding 15 is formed by winding a pair of lead wires 15a and lead wires 15b that are insulatingly coated on 12.
  • the ends of the lead wires 15a and 15b are joined on both sides to form the end 15c and the end 15d.
  • the end portion 15c and the end portion 15d are electrically connected to each of the two external electrodes 17 provided on each of the pair of collar portions 13.
  • a magnetic plate 14 is bonded to the upper part of the pair of collars 13 with an adhesive (not shown).
  • This common mode choke coil is about 3.2 mm in length (direction of winding core), about 2.5 mm in width, and about 2.2 mm in height.
  • the thickness of the magnetic plate 14 is about 0.6 mm.
  • the winding 15 uses an insulating coated conductive wire having a diameter of about 0.05 mm.
  • the surface opposite to the magnetic plate 14 is the mounting surface 21.
  • the collar portion 13 has a width of about 2.5 mm, a height of about 1.6 mm, and a maximum thickness of about 0.6 mm.
  • a recess 20 is provided on the surface of the flange portion 13 on the winding core portion 12 side, which is recessed by about 0.06 mm from the periphery on the mounting surface 21 side from the surface where the winding core portion 12 and the collar portion 13 intersect.
  • the region where the recess 20 is provided is referred to as a first region 18, and both outer portions from the recess 20 are referred to as a second region 19. That is, in the second region 19, the thickness of the flange portion 13 is the largest, which is about 0.6 mm.
  • the thickness of the first region 18 is about 0.06 mm thinner than the thickness of the second region 19.
  • FIG. 2 is a schematic cross-sectional view taken along line II-II of FIG. 1 of the magnetic core 11 used in the common mode choke coil according to the embodiment of the present disclosure. That is, FIG.
  • the line segment L is a region of the flange portion 13 including the joint surface between the winding core portion 12 and the flange portion 13 from the joint surface toward the mounting surface 21, and is in contact with the edge of the joint surface and the mounting surface 21. It is a perpendicular line extending to the side with respect to the mounting surface 21.
  • the first region 18 and the second region 19 are defined with this L1 as a boundary.
  • such a magnetic core 11 is obtained by mixing ferrite powder with a binder, press-molding it, and sintering it.
  • press molding is performed using a mold, but the connecting portion 22 between the flange portion 13 and the winding core portion 12 does not have a perfect right angle, and the connecting portion 22 rises a little to generate a bulge 23, which is usually 0.
  • a recess 20 recessed about 0.06 mm from the periphery is provided on the mounting surface 21 side from the line where the winding core portion 12 and the flange portion 13 intersect. Therefore, as shown in FIG. 3, the portion where the winding core portion 12 and the flange portion 13 on the mounting surface 21 side are connected (region A in FIG. 3) does not become a curved surface when viewed from the side surface, as shown in FIG. It can have corners and be in a substantially orthogonal state. I will explain this a little more.
  • FIG. 3 is a side view of the magnetic core 11 used in the common mode choke coil of the present embodiment.
  • the region A shows a portion where the winding core portion 12 and the flange portion 13 on the mounting surface 21 side are connected.
  • FIG. 4 is a diagram showing the main surface 24 of the collar portion 13 of the magnetic core 11 in FIG.
  • the surface of the collar portion 13 on the winding core portion 12 side is represented as the main surface 24.
  • the region of the surface where the winding core portion 12 and the flange portion 13 intersect on the main surface 24 is represented as the central region 25.
  • the region other than the central region 25 is the peripheral region 26.
  • the region where the recess 20 is provided is the first region 18, and the region extending from the recess 20 to both outer portions is the second region 19.
  • FIG. 5 is a partially enlarged perspective view of the magnetic core 11 including the region A in FIG.
  • the intersection of the side line Le of the winding core portion 12 and the main surface 24 of the flange portion 13 on the mounting surface 21 side is the intersection B, and the other side line of the winding core portion 12 and the main surface 24 of the collar portion 13 Let the intersection be the intersection C.
  • Lf be a straight line passing through the intersection B and the intersection C.
  • the first region 18 and the second region 19 are on the front side (mounting surface side) of the straight line Lf. That is, the first region 18 and the second region 19 extend in the front direction from the central region 25 (not shown in FIG. 5) when viewed from the mounting surface 21.
  • the winding 15 without looseness can be obtained. Therefore, it is necessary to provide the recess 20 in the portion of the line (line segment BC) where the winding core portion 12 and the flange portion 13 intersect.
  • the second region 19 in which the recess 20 is not provided needs to be provided on the mounting surface side of the wire portion (line segment BC) where the winding core portion 12 and the flange portion 13 intersect. This is because without the second region 19, the winding 15 cannot be supported on the mounting surface side of the wire portion (line segment BC) where the winding core portion 12 and the flange portion 13 intersect, and the winding 15 cannot be supported. This is because it will loosen.
  • the depth of the recess 20 is at least half the wire diameter of the winding 15.
  • the depth of the recess 20 is made too deep, the strength of the flange portion 13 becomes weak, so it is desirable that the depth of the recess 20 is less than half the thickness of the second region 19. Further, it is more preferable that the depth of the recess 20 is not less than the wire diameter of the winding 15 and not more than a quarter of the thickness of the second region 19.
  • the concave portion 20 has a tapered shape in which the thickness becomes thinner as the distance from the winding core portion 12 increases.
  • the thickness of the first region 18 near the mounting surface 21 is set to be about 0.03 mm thinner than the thickness of the first region 18 near the winding core portion 12, and this period changes linearly.
  • a taper is provided so as to.
  • the second region 19 is in a parallel state without providing this taper.
  • FIG. 6 schematically shows the side surface of the common mode choke coil 10 according to the modified example.
  • the magnetic core 11, the winding core portion 12, the flange portion 13, and the winding 15 are common as the common mode choke coil 10.
  • the winding core portion 12 has a columnar shape, which is common to each modification. Therefore, in the following modification, the shape of the main surface of the collar portion 13 will be described.
  • the central region 25 and the peripheral region 26 of the main surface of the collar portion 13 are common.
  • the intersection point B, the intersection point C, and the straight line Lf are also common, they are shown only and will not be described in detail.
  • the recess 20 is also common, it is shown only if it is not necessary.
  • the first region 18 has a line segment BC on one side, and the second region 19 is adjacent to the first region 18. Further, the first region 18 and the second region 19 are provided in the direction toward the mounting surface 21 with the straight line Lf as a boundary.
  • the common mode choke coil 10 in the first modified example uses a square columnar winding core portion 12 similar to that shown in FIG. As shown in FIG. 7, the first region 18 on the main surface of the collar portion 13 has a trapezoidal shape that expands from the central region 25 toward the mounting surface 21. Both the first region 18 and the second region are in contact with the mounting surface 21.
  • the common mode choke coil 10 in this first modification has the same effect as the common mode choke coil 10 according to the above embodiment.
  • the common mode choke coil 10 in the second modified example uses a square columnar winding core portion 12 similar to that shown in FIG. As shown in FIG. 8, the first region 18 on the main surface of the collar portion 13 has a narrow trapezoidal shape from the central region 25 toward the mounting surface 21. Both the first region 18 and the second region are in contact with the mounting surface 21.
  • the common mode choke coil 10 in this second modification has the same effect as the common mode choke coil 10 according to the above embodiment.
  • the common mode choke coil 10 of the first modification and the second modification is compared with the common mode choke coil 10 of the above embodiment having the rectangular first region 18 shown in FIG.
  • the rectangular first region 18 in the above embodiment has a larger area of the second region 19 than the first region 18 in the first modification. Therefore, the rectangular first region 18 in the above embodiment can have a wider region for supporting the winding 15 than the first region 18 in the first modification. Therefore, the common mode choke coil 10 according to the above embodiment can further prevent loosening of the winding 15 as compared with the common mode choke coil 10 according to the first modification.
  • the rectangular first region 18 in the above embodiment can make the area of the second region 19 near the intersection B and the intersection C smaller than that of the first region 18 in the second modification. Therefore, the rectangular first region 18 in the above embodiment is affected by the swelling 23 due to the joining between the winding core portion 12 supporting the winding 15 and the flange portion 13 as compared with the first region 18 in the second modification. Can be smaller. Therefore, the rectangular first region 18 in the above embodiment can reduce the lift of the winding 15 as compared with the first region 18 in the second modification. As a result, the common mode choke coil 10 according to the above embodiment can further prevent loosening of the winding 15 as compared with the common mode choke coil 10 according to the second modification.
  • the rectangular first region 18 in the above embodiment is optimal.
  • the rectangular first region 18 is a region in which the line segment BC is projected toward the mounting surface 21 when viewed from a direction perpendicular to the main surface 24 (second region 19).
  • the common mode choke coil 10 in the third modified example uses a square columnar winding core portion 12 similar to that shown in FIG. As shown in FIG. 9, the first region 18 on the main surface of the collar portion 13 has a recess 20 which is a rectangular groove along the line segment BC.
  • the common mode choke coil 10 in this third modification has the same effect as the common mode choke coil 10 according to the above embodiment.
  • the depth of the recess 20 is at least half the wire diameter of the winding 15.
  • the depth of the recess 20 is made too deep, the strength of the flange portion 13 becomes weak, so it is desirable that the depth of the recess 20 is less than half the thickness of the second region 19.
  • the depth of the recess 20 is not less than the wire diameter of the winding 15 and not more than a quarter of the thickness of the second region 19.
  • the width of the recess 20 in the direction toward the mounting surface 21 is preferably equal to or larger than the thickness of the winding 15.
  • the common mode choke coil 10 in the fourth modified example uses a winding core portion 12 of a pentagonal prism. As shown in FIG. 10, in the main surface of the collar portion 13, the first region 18 has a rectangular recess 20 along the line segment BC which is one side of the pentagon.
  • the common mode choke coil 10 in the fourth modification has the same effect as the common mode choke coil 10 according to the above embodiment.
  • a triangular prism or a prism having a hexagonal or more angle can be used as the winding core portion 12.
  • the common mode choke coil 10 in the fifth modification uses a cylindrical winding core portion 12 having a surface including the line segment BC as a notch portion. As shown in FIG. 11, the first region 18 on the main surface of the collar portion 13 has a rectangular recess 20 along the line segment BC which is a notch portion.
  • the common mode choke coil 10 in the fifth modification has the same effect as the common mode choke coil 10 according to the above embodiment.
  • a column having an elliptical cross section whose cutout portion is the surface including the line segment BC may be used, and the line segment BC may be used in addition to the ellipse.
  • a cylinder having a closed curved cross section having a cutout portion on the including surface may be used.
  • the common mode choke coil according to the present disclosure is industrially useful because it can prevent loosening of windings and can obtain a common mode choke coil having excellent mode conversion characteristics.

Abstract

Provided is a common-mode choke coil that prevents loosening of winding and has superior mode conversion characteristics. The common mode choke coil comprises: a magnetic core (11); external electrodes (17); a pair of windings (15); and a magnetic plate (14). The magnetic core (11) has a winding core portion (12) and a pair of flange portions (13) provided at both ends of the winding core portion (12). The external electrodes (17) are formed on the flange portions (13). The windings (15) are wound around the winding core portion (12) and have ends thereof leading out to the external electrodes (17). The magnetic plate (14) is bonded to the pair of flange portions (13) with an adhesive. A region of the flange portions (13) from the winding core portion (12) toward mounting surfaces (21) includes a first region from a plane where the winding core portion (12) and the flange portions (13) intersect toward the mounting surfaces (21), and a second region spaced apart more from the winding core portion (12) than the first region, wherein the thickness of the first region is made smaller than the thickness of the second region.

Description

コモンモードチョークコイルCommon mode choke coil
　本開示は、コアとワイヤとを備えたコモンモードチョークコイルに関し、特にノイズを除去するコモンモードフィルタに用いて好適なコモンモードチョークコイルに関する。 The present disclosure relates to a common mode choke coil provided with a core and a wire, and particularly to a common mode choke coil suitable for use in a common mode filter for removing noise.
　近年自動車市場における電子化の動きは目覚ましく、１台あたりに搭載される電気機器の数はますます増加してきている。これらの通信に車載ＬＡＮ（ＬＡＮ：Local Area Network）が用いられ、大量の情報を伝達するために、高速化、通信品質の高信頼性が要求される。このため不要輻射ノイズ対策や高周波信号のコモンモードノイズ対策が必要となり、巻線型コモンモードチョークコイルが多く用いられている。 In recent years, the movement toward computerization in the automobile market has been remarkable, and the number of electric devices installed in each unit is increasing more and more. An in-vehicle LAN (LAN: Local Area Network) is used for these communications, and in order to transmit a large amount of information, high speed and high reliability of communication quality are required. Therefore, it is necessary to take measures against unnecessary radiation noise and common mode noise of high frequency signals, and winding type common mode choke coils are often used.
　このような従来技術のコモンモードチョークコイルは、巻芯の両側に鍔部が形成されたフェライト磁性コアと、磁性コアの巻芯にバイファイラ巻等によって数ターン～数十ターン巻回された複数の絶縁被膜銅線からなるワイヤと、磁性コアとほぼ同じ透磁率を有し磁性コアの両方に設けられた鍔部と、鍔部の上に配置された磁性板とによって構成されている。磁性コアおよび磁性板はフェライト粉末に結合剤を混ぜてプレス成型し、これを焼成することによって得られる。さらに、両方の鍔部または一方の鍔部には複数の電極が形成され、ワイヤの巻始めの端部と巻終りの端部はこれらの電極に対してそれぞれ半田付け、熱圧着等によって導電接続されている。そして、このようなコモンモードチョークコイルでは、コアの巻芯に巻回するワイヤの巻回回数を適宜設定することによって所望のインピーダンス値を得ていた。 Such a conventional common mode choke coil has a ferrite magnetic core in which flanges are formed on both sides of the winding core, and a plurality of turns wound on the winding core of the magnetic core by a bifilar winding or the like for several turns to several tens of turns. It is composed of a wire made of an insulating coated copper wire, a flange portion provided on both of the magnetic core having a magnetic permeability substantially the same as that of the magnetic core, and a magnetic plate arranged on the collar portion. The magnetic core and the magnetic plate are obtained by mixing a binder with ferrite powder, press-molding, and firing this. Further, a plurality of electrodes are formed on both flanges or one flange, and the end of the wire winding start and the end of the winding end are conductively connected to these electrodes by soldering, thermocompression bonding, etc., respectively. Has been done. Then, in such a common mode choke coil, a desired impedance value is obtained by appropriately setting the number of windings of the wire wound around the core of the core.
　なお、この出願の発明に関連する先行技術文献情報としては、例えば、特許文献１が知られている。 As the prior art document information related to the invention of this application, for example, Patent Document 1 is known.
特開２００３－１６８６１１号公報Japanese Unexamined Patent Publication No. 2003-168611
　しかしながら、従来多く用いられてきたＣＡＮ通信では通常のコモンモードチョークコイルで問題なかったが、さらに高速の車載イーサネット（Ethernet）通信では、モード変換特性の抑制等さらに高度な性能が要求されるようになる。しかしながら巻芯部に巻回された巻線がゆるむと１対の巻線間のインダクタンス値に差異が生じ、モード変換特性が劣化しやすくなる。 However, in CAN communication, which has been widely used in the past, there was no problem with a normal common mode choke coil, but in higher speed in-vehicle Ethernet communication, higher performance such as suppression of mode conversion characteristics is required. Become. However, if the winding wound around the winding core is loosened, the inductance value between the pair of windings will differ, and the mode conversion characteristics will easily deteriorate.
　本開示に係る発明は上記問題を解決するために、以下の構成を備える。 The invention according to the present disclosure has the following configurations in order to solve the above problems.
　すなわち、本開示のコモンモードチョークコイルは、磁性コアと、一対の外部電極と、２本の巻線と、磁性板と、を備える。磁性コアは、巻芯部と、一対の鍔部と、を有する。巻芯部は、第１の方向に延びる柱状の形状を有する。一対の鍔部の各々は、巻芯部の両端の各々に設けられている。一対の鍔部の各々には、主面と実装面とが設けられている。一対の外部電極は、一対の鍔部の各々に、各々設けられている。２本の巻線は、巻芯部に巻回される。磁性板は、一対の鍔部の実装面とは反対側の面に接合されている。２本の巻線の各々の一端は、一対の鍔部の一方に設けられた一対の外部電極の一方に接合される。２本の巻線の各々の他端は、一対の鍔部の他方に設けられた一対の外部電極の他方に接合される。一対の鍔部の各々が備える主面は、中央領域と、周辺領域とを有する。中央領域は、巻芯部と接する領域である。周辺領域は、中央領域の周囲に配置された領域である。周辺領域は、第１領域と、第２領域とを有する。第１領域は、中央領域に接し、中央領域から実装面に向かって延びる。第２領域は、第１領域に隣接する。また、第２領域は、実装面からみて中央領域より手前方向へ延びる。第１の方向における第１領域の厚さは、第２領域の厚さよりも薄い。 That is, the common mode choke coil of the present disclosure includes a magnetic core, a pair of external electrodes, two windings, and a magnetic plate. The magnetic core has a winding core portion and a pair of collar portions. The winding core portion has a columnar shape extending in the first direction. Each of the pair of collar portions is provided at both ends of the winding core portion. Each of the pair of collars is provided with a main surface and a mounting surface. A pair of external electrodes are provided on each of the pair of collar portions. The two windings are wound around the core. The magnetic plate is joined to the surface of the pair of collars opposite to the mounting surface. One end of each of the two windings is joined to one of a pair of external electrodes provided on one of the pair of collars. The other end of each of the two windings is joined to the other of a pair of external electrodes provided on the other of the pair of collars. The main surface of each of the pair of collars has a central region and a peripheral region. The central region is a region in contact with the core portion. The peripheral area is an area arranged around the central area. The peripheral region has a first region and a second region. The first region is in contact with the central region and extends from the central region toward the mounting surface. The second region is adjacent to the first region. Further, the second region extends in the front direction from the central region when viewed from the mounting surface. The thickness of the first region in the first direction is thinner than the thickness of the second region.
　上記構成により、巻線のゆるみを防止し、モード変換特性に優れたコモンモードチョークコイルを得ることができる。 With the above configuration, it is possible to prevent loosening of the winding and obtain a common mode choke coil with excellent mode conversion characteristics.
本開示の一実施の形態におけるコモンモードチョークコイルの側面図である。It is a side view of the common mode choke coil in one Embodiment of this disclosure. 同コモンモードチョークコイルに用いられる磁性コアの図１におけるII－II線断面見取図である。It is a cross-sectional view of the line II-II in FIG. 1 of the magnetic core used for the common mode choke coil. 同コモンモードチョークコイルに用いられる磁性コアの側面図である。It is a side view of the magnetic core used for the common mode choke coil. 同コモンモードチョークコイルに用いられる磁性コアを構成する鍔部の主面を示す図である。It is a figure which shows the main surface of the flange part which comprises the magnetic core used for the common mode choke coil. 同コモンモードチョークコイルに用いられる磁性コアの一部拡大斜視図である。It is a partially enlarged perspective view of the magnetic core used for the common mode choke coil. 本開示の一実施の形態の変形例にかかるコモンモードチョークコイルの側面を模式的に示す図である。It is a figure which shows typically the side surface of the common mode choke coil which concerns on the modification of one Embodiment of this disclosure. 本開示の一実施の形態の第１変形例にかかるコモンモードチョークコイルにおいて、磁性コアを構成する鍔部の主面を示す図である。It is a figure which shows the main surface of the flange part which constitutes a magnetic core in the common mode choke coil which concerns on the 1st modification of 1st Embodiment of this disclosure. 同第２変形例にかかるコモンモードチョークコイルにおいて、磁性コアを構成する鍔部の主面を示す図である。It is a figure which shows the main surface of the flange part which constitutes a magnetic core in the common mode choke coil which concerns on the 2nd modification. 同第３変形例にかかるコモンモードチョークコイルにおいて、磁性コアを構成する鍔部の主面を示す図である。It is a figure which shows the main surface of the flange part which constitutes a magnetic core in the common mode choke coil which concerns on the 3rd modification. 同第４変形例にかかるコモンモードチョークコイルにおいて、磁性コアを構成する鍔部の主面を示す図である。It is a figure which shows the main surface of the flange part which constitutes a magnetic core in the common mode choke coil which concerns on the 4th modification. 同第５変形例にかかるコモンモードチョークコイルにおいて、磁性コアを構成する鍔部の主面を示す図である。It is a figure which shows the main surface of the flange part which constitutes a magnetic core in the common mode choke coil which concerns on the 5th modification.
　（１）本開示のコモンモードチョークコイルについて
　本開示の第１の態様のコモンモードチョークコイルは、磁性コアと、一対の外部電極と、２本の巻線と、磁性板と、を備える。磁性コアは、巻芯部と、一対の鍔部と、を有する。巻芯部は、第１の方向に延びる柱状の形状を有する。一対の鍔部の各々は、巻芯部の両端の各々に設けられている。一対の鍔部の各々には、主面と実装面とが設けられている。一対の外部電極は、一対の鍔部の各々に、各々設けられている。２本の巻線は、巻芯部に巻回される。磁性板は、一対の鍔部の実装面とは反対側の面に接合されている。２本の巻線の各々の一端は、一対の鍔部の一方に設けられた一対の外部電極の一方に接合される。２本の巻線の各々の他端は、一対の鍔部の他方に設けられた一対の外部電極の他方に接合される。一対の鍔部の各々が備える主面は、中央領域と、周辺領域とを有する。中央領域は、巻芯部と接する領域である。周辺領域は、中央領域の周囲に配置された領域である。周辺領域は、第１領域と、第２領域とを有する。第１領域は、中央領域に接し、中央領域から実装面に向かって延びる。第２領域は、第１領域に隣接する。また、第２領域は、実装面からみて中央領域より手前方向へ延びる。第１の方向における第１領域の厚さは、第２領域の厚さよりも薄い。 (1) Common Mode Choke Coil of the Present Disclosure The common mode choke coil of the first aspect of the present disclosure includes a magnetic core, a pair of external electrodes, two windings, and a magnetic plate. The magnetic core has a winding core portion and a pair of collar portions. The winding core portion has a columnar shape extending in the first direction. Each of the pair of collar portions is provided at both ends of the winding core portion. Each of the pair of collars is provided with a main surface and a mounting surface. A pair of external electrodes are provided on each of the pair of collar portions. The two windings are wound around the core. The magnetic plate is joined to the surface of the pair of collars opposite to the mounting surface. One end of each of the two windings is joined to one of a pair of external electrodes provided on one of the pair of collars. The other end of each of the two windings is joined to the other of a pair of external electrodes provided on the other of the pair of collars. The main surface of each of the pair of collars has a central region and a peripheral region. The central region is a region in contact with the core portion. The peripheral area is an area arranged around the central area. The peripheral region has a first region and a second region. The first region is in contact with the central region and extends from the central region toward the mounting surface. The second region is adjacent to the first region. Further, the second region extends in the front direction from the central region when viewed from the mounting surface. The thickness of the first region in the first direction is thinner than the thickness of the second region.
　本開示の第２の態様のコモンモードチョークコイルは、第１の態様について第１領域に凹部を設けることにより、第１領域での鍔部の厚さを第２領域での鍔部の厚さよりも薄くする。 In the common mode choke coil of the second aspect of the present disclosure, the thickness of the collar portion in the first region is set to be larger than the thickness of the collar portion in the second region by providing a recess in the first region for the first aspect. Also thin.
　本開示の第３の態様のコモンモードチョークコイルは、第２の態様について第２領域での鍔部の厚さから第１領域での鍔部の厚さを減じた値を、巻線の線径の半分以上、第２領域での鍔部の厚さの半分以下としている。 In the common mode choke coil of the third aspect of the present disclosure, the winding wire is obtained by subtracting the thickness of the collar portion in the first region from the thickness of the collar portion in the second region in the second aspect. It is set to be at least half the diameter and at least half the thickness of the collar in the second region.
　本開示の第４の態様のコモンモードチョークコイルは、第３の態様について第２領域での鍔部の厚さから第１領域での鍔部の厚さを減じた値を、巻線の線径以上、鍔部の第２領域での厚さの４分の１以下としている。 In the common mode choke coil of the fourth aspect of the present disclosure, the winding wire is obtained by subtracting the thickness of the collar portion in the first region from the thickness of the collar portion in the second region in the third aspect. It is set to be equal to or larger than the diameter and less than a quarter of the thickness in the second region of the collar.
　本開示の第５の態様のコモンモードチョークコイルは、第２の態様について凹部は、巻芯部から離れるにしたがって第１領域での鍔部の厚さが薄くなるテーパ状になっている。 In the common mode choke coil of the fifth aspect of the present disclosure, the recess of the second aspect has a tapered shape in which the thickness of the collar portion in the first region becomes thinner as the distance from the winding core portion increases.
　本開示の第６の態様のコモンモードチョークコイルは、第１の態様について周辺領域を形成する辺を含みかつ巻芯部の側面が平面であり、平面と第２領域とのなす角度が９０度である。 The common mode choke coil of the sixth aspect of the present disclosure includes a side forming a peripheral region and the side surface of the winding core portion is a flat surface for the first aspect, and the angle formed by the flat surface and the second region is 90 degrees. Is.
　（２）実施の形態
　以下、本開示の一実施の形態におけるコモンモードチョークコイルについて、図面を参照しながら説明する。なお、以下に述べる構造や数値は本開示のコモンモードチョークコイルの一例であり、本開示のコモンモードチョークコイルは当該構造や数値に限定されるものではない。 (2) Embodiment Hereinafter, the common mode choke coil according to the embodiment of the present disclosure will be described with reference to the drawings. The structures and numerical values described below are examples of the common mode choke coils of the present disclosure, and the common mode choke coils of the present disclosure are not limited to the structures and numerical values.
　図１は本開示の一実施の形態におけるコモンモードチョークコイルの側面図である。図２は図１のコモンモードチョークコイルのII－II線断面見取図である。図３は本開示の一実施の形態のコモンモードチョークコイルに用いられる磁性コアの側面図である。図４は、図３における磁性コアの、鍔部の主面を示す図である。図５は、図３に示す磁性コアの一部拡大斜視図である。 FIG. 1 is a side view of the common mode choke coil according to the embodiment of the present disclosure. FIG. 2 is a schematic cross-sectional view taken along line II-II of the common mode choke coil of FIG. FIG. 3 is a side view of a magnetic core used in the common mode choke coil of the embodiment of the present disclosure. FIG. 4 is a diagram showing the main surface of the collar portion of the magnetic core in FIG. FIG. 5 is a partially enlarged perspective view of the magnetic core shown in FIG.
　本開示のコモンモードチョークコイル１０において、磁性コア１１は四角柱の形状を有する巻芯部１２及びこの巻芯部１２の両端部に設けられた１対の鍔部１３からなり、この巻芯部１２に絶縁被覆された１対の導線１５ａ、導線１５ｂが巻回されることによって巻線１５を構成している。それぞれの導線１５ａ、導線１５ｂの端部が両側で接合されて端部１５ｃ、端部１５ｄが形成される。端部１５ｃ、端部１５ｄは一対の鍔部１３のそれぞれに設けられた、２つの外部電極１７のそれぞれに電気的に接続されている。 In the common mode choke coil 10 of the present disclosure, the magnetic core 11 is composed of a winding core portion 12 having a square pillar shape and a pair of flange portions 13 provided at both ends of the winding core portion 12. The winding 15 is formed by winding a pair of lead wires 15a and lead wires 15b that are insulatingly coated on 12. The ends of the lead wires 15a and 15b are joined on both sides to form the end 15c and the end 15d. The end portion 15c and the end portion 15d are electrically connected to each of the two external electrodes 17 provided on each of the pair of collar portions 13.
　１対の鍔部１３の上部には磁性板１４が接着剤（図示せず）により接合されている。 A magnetic plate 14 is bonded to the upper part of the pair of collars 13 with an adhesive (not shown).
　このコモンモードチョークコイルの大きさは、長さ（巻芯方向）約３．２ｍｍ、幅約２．５ｍｍ、高さ約２．２ｍｍとなっている。磁性板１４の厚さは約０．６ｍｍとなっている。さらに巻線１５は直径約０．０５ｍｍの絶縁被覆導線を用いている。また磁性板１４とは反対側の面が実装面２１となっている。 The size of this common mode choke coil is about 3.2 mm in length (direction of winding core), about 2.5 mm in width, and about 2.2 mm in height. The thickness of the magnetic plate 14 is about 0.6 mm. Further, the winding 15 uses an insulating coated conductive wire having a diameter of about 0.05 mm. The surface opposite to the magnetic plate 14 is the mounting surface 21.
　鍔部１３は幅約２．５ｍｍ、高さ約１．６ｍｍ、最大厚さが約０．６ｍｍとなっている。鍔部１３の巻芯部１２側の面の、巻芯部１２と鍔部１３が交わる面から実装面２１側に周辺よりも約０．０６ｍｍ凹んだ凹部２０が設けられている。ここで、凹部２０が設けられている領域を第１領域１８、凹部２０から両外側部を第２領域１９と称する。すなわち第２領域１９では鍔部１３の厚さの中で最大の厚さとなり、これが約０．６ｍｍとなっている。これに対して第１領域１８の厚さは、第２領域１９の厚さに比べて約０．０６ｍｍ薄くなっている。なお、ここでいう厚さは、図３および図５においてｔ１、ｔ２で表される。すなわち、ｔ１は第２領域１９では鍔部１３の厚さの中で最大の厚さであり、ｔ１＝約０．６ｍｍである。また、ｔ２は第１領域１８の厚さであり、ｔ２はｔ１より約０．０６ｍｍ薄い。すなわち、ｔ２＝約０．５４ｍｍである。図２は、本開示の一実施の形態におけるコモンモードチョークコイルに用いられる磁性コア１１の図１におけるII－II線断面見取図である。すなわち図２は、図１においてII－II線を含み紙面に垂直な面で切った断面図と、II－II線から延びる矢印方向に鍔部１３をみたときの鍔部１３の表面を同時に示した図である。図２において線分Ｌは、巻芯部１２と鍔部１３との接合面を含む鍔部１３の面において、接合面より実装面２１へ向かう領域で、接合面の縁に接しかつ実装面２１側へ伸びる、実装面２１に対する垂線である。このＬ１を境界として第１領域１８および第２領域１９が規定される。 The collar portion 13 has a width of about 2.5 mm, a height of about 1.6 mm, and a maximum thickness of about 0.6 mm. A recess 20 is provided on the surface of the flange portion 13 on the winding core portion 12 side, which is recessed by about 0.06 mm from the periphery on the mounting surface 21 side from the surface where the winding core portion 12 and the collar portion 13 intersect. Here, the region where the recess 20 is provided is referred to as a first region 18, and both outer portions from the recess 20 are referred to as a second region 19. That is, in the second region 19, the thickness of the flange portion 13 is the largest, which is about 0.6 mm. On the other hand, the thickness of the first region 18 is about 0.06 mm thinner than the thickness of the second region 19. The thickness referred to here is represented by t1 and t2 in FIGS. 3 and 5. That is, t1 is the maximum thickness of the collar portion 13 in the second region 19, and t1 = about 0.6 mm. Further, t2 is the thickness of the first region 18, and t2 is about 0.06 mm thinner than t1. That is, t2 = about 0.54 mm. FIG. 2 is a schematic cross-sectional view taken along line II-II of FIG. 1 of the magnetic core 11 used in the common mode choke coil according to the embodiment of the present disclosure. That is, FIG. 2 simultaneously shows a cross-sectional view taken along a plane perpendicular to the paper surface including the line II-II in FIG. 1 and the surface of the collar portion 13 when the collar portion 13 is viewed in the direction of the arrow extending from the line II-II. It is a figure. In FIG. 2, the line segment L is a region of the flange portion 13 including the joint surface between the winding core portion 12 and the flange portion 13 from the joint surface toward the mounting surface 21, and is in contact with the edge of the joint surface and the mounting surface 21. It is a perpendicular line extending to the side with respect to the mounting surface 21. The first region 18 and the second region 19 are defined with this L1 as a boundary.
　通常このような磁性コア１１は、フェライト粉体にバインダーを混ぜてプレス成型し、これを焼結させることにより得られる。このとき金型を用いてプレス成型を行うが、鍔部１３と巻芯部１２とのつなぎ部分２２は、完全な直角にはならず、つなぎ部分２２が少し盛り上がって盛り上がり２３が生じ、通常０．１ｍｍ以上の曲率半径をもった曲面となる。このつなぎ部分２２の４面全ての曲率半径が巻線１５の線径の半分よりも大きくなると、巻線１５をこのつなぎ部分２２まで巻いたときに曲面にのりあげてしまう。その結果、巻線１５のゆるみが発生しやすい。そのためモード変換特性等が劣化しやすくなる。 Normally, such a magnetic core 11 is obtained by mixing ferrite powder with a binder, press-molding it, and sintering it. At this time, press molding is performed using a mold, but the connecting portion 22 between the flange portion 13 and the winding core portion 12 does not have a perfect right angle, and the connecting portion 22 rises a little to generate a bulge 23, which is usually 0. A curved surface with a radius of curvature of 1 mm or more. If the radius of curvature of all four surfaces of the connecting portion 22 is larger than half the wire diameter of the winding 15, the winding 15 will be rolled up on a curved surface when it is wound up to the connecting portion 22. As a result, loosening of the winding 15 is likely to occur. Therefore, the mode conversion characteristics and the like are likely to deteriorate.
　これに対して本実施の形態では、巻芯部１２と鍔部１３が交わる線から実装面２１側に周辺よりも約０．０６ｍｍ凹んだ凹部２０が設けられている。そのため、図３のように側面から見たときに実装面２１側の巻芯部１２と鍔部１３が接続する部分（図３における領域Ａ）で曲面とはならず、図５に示すように角部を有してほぼ直交した状態とすることができる。このことをもう少し説明する。 On the other hand, in the present embodiment, a recess 20 recessed about 0.06 mm from the periphery is provided on the mounting surface 21 side from the line where the winding core portion 12 and the flange portion 13 intersect. Therefore, as shown in FIG. 3, the portion where the winding core portion 12 and the flange portion 13 on the mounting surface 21 side are connected (region A in FIG. 3) does not become a curved surface when viewed from the side surface, as shown in FIG. It can have corners and be in a substantially orthogonal state. I will explain this a little more.
　図３は本実施形態のコモンモードチョークコイルに用いられる磁性コア１１の側面図である。図３において領域Ａは、実装面２１側の巻芯部１２と鍔部１３が接続する部分を示す。 FIG. 3 is a side view of the magnetic core 11 used in the common mode choke coil of the present embodiment. In FIG. 3, the region A shows a portion where the winding core portion 12 and the flange portion 13 on the mounting surface 21 side are connected.
　図４は、図３における磁性コア１１の、鍔部１３の主面２４を示す図である。図４において、鍔部１３の巻芯部１２側の面は主面２４として表される。また、主面２４において巻芯部１２と鍔部１３が交わる面の領域を中央領域２５として表される。また、主面２４のうち、中央領域２５以外の領域は、周辺領域２６である。ここで、周辺領域２６のうち、凹部２０が設けられている領域が第１領域１８、凹部２０から両外側部へ広がる領域が第２領域１９である。 FIG. 4 is a diagram showing the main surface 24 of the collar portion 13 of the magnetic core 11 in FIG. In FIG. 4, the surface of the collar portion 13 on the winding core portion 12 side is represented as the main surface 24. Further, the region of the surface where the winding core portion 12 and the flange portion 13 intersect on the main surface 24 is represented as the central region 25. Further, in the main surface 24, the region other than the central region 25 is the peripheral region 26. Here, of the peripheral regions 26, the region where the recess 20 is provided is the first region 18, and the region extending from the recess 20 to both outer portions is the second region 19.
　図５は、図３における領域Ａを含む磁性コア１１の一部拡大斜視図である。図５において、実装面２１側における巻芯部１２の側線Ｌｅと鍔部１３の主面２４との交点を交点Ｂ、巻芯部１２のもう一方の側線と鍔部１３の主面２４との交点を交点Ｃとする。交点Ｂと交点Ｃとを通る直線をＬｆとする。図５において、第１領域１８および第２領域１９は、直線Ｌｆよりも手前側（実装面側）にある。すなわち、第１領域１８および第２領域１９は、実装面２１からみて中央領域２５（図５においては図示せず）より手前方向へ延びる。 FIG. 5 is a partially enlarged perspective view of the magnetic core 11 including the region A in FIG. In FIG. 5, the intersection of the side line Le of the winding core portion 12 and the main surface 24 of the flange portion 13 on the mounting surface 21 side is the intersection B, and the other side line of the winding core portion 12 and the main surface 24 of the collar portion 13 Let the intersection be the intersection C. Let Lf be a straight line passing through the intersection B and the intersection C. In FIG. 5, the first region 18 and the second region 19 are on the front side (mounting surface side) of the straight line Lf. That is, the first region 18 and the second region 19 extend in the front direction from the central region 25 (not shown in FIG. 5) when viewed from the mounting surface 21.
　図３において、鍔部１３の凹部２０が設けられている領域では、つなぎ部分２２に盛り上がり２３は生じない。このことは、図５においてつなぎ部分２２を示す線分ＢＣにおいて盛り上がり２３が生じないことで示されている。そのため、図５に示すように、交点Ｂにおいて巻芯部１２の側線Ｌｅと鍔部１３の主面２４および第２領域１９とはほぼ直角に交わる。また、交点Ｃにおいても巻芯部１２の側線と鍔部１３の主面２４および第２領域１９はほぼ直角に交わる。また、線分ＢＣにおいて、巻芯部１２の側面と鍔部１３の主面２４（第１領域１８）とは所定の角度をなして接続する。すなわち、線分ＢＣ全体で角部を有することになる。 In FIG. 3, in the region where the recess 20 of the collar portion 13 is provided, the swelling 23 does not occur in the connecting portion 22. This is shown by the fact that the swelling 23 does not occur in the line segment BC showing the connecting portion 22 in FIG. Therefore, as shown in FIG. 5, at the intersection B, the lateral line Le of the winding core portion 12 and the main surface 24 and the second region 19 of the flange portion 13 intersect at a substantially right angle. Further, at the intersection C, the lateral line of the winding core portion 12 and the main surface 24 and the second region 19 of the flange portion 13 intersect at a substantially right angle. Further, in the line segment BC, the side surface of the winding core portion 12 and the main surface 24 (first region 18) of the flange portion 13 are connected at a predetermined angle. That is, the entire line segment BC has a corner portion.
　このように巻芯部１２の４辺の内１つの辺全体を、角部を有した状態とすることにより、ゆるみのない巻線１５とすることができる。そのため凹部２０は、巻芯部１２と鍔部１３が交わる線の部分（線分ＢＣ）には設けることが必要である。なお、凹部２０が設けられていない第２領域１９は、巻芯部１２と鍔部１３が交わる線の部分（線分ＢＣ）よりも実装面側に設ける必要がある。なぜならば、この第２領域１９がなければ、巻芯部１２と鍔部１３が交わる線の部分（線分ＢＣ）よりも実装面側において巻線１５を支えることができなくなり、巻線１５がゆるむことになるからである。すなわち、第２領域１９がなければ線分ＢＣ全体で角部を有する意味がなくなることになる。このように、巻芯部１２と鍔部１３が交わる線の部分（線分ＢＣ）を設け、かつ第２領域１９を設けることにより、巻きゆるみのないコモンモードチョークコイルを得ることができる。 By setting the entire side of one of the four sides of the winding core portion 12 to have a corner portion in this way, the winding 15 without looseness can be obtained. Therefore, it is necessary to provide the recess 20 in the portion of the line (line segment BC) where the winding core portion 12 and the flange portion 13 intersect. The second region 19 in which the recess 20 is not provided needs to be provided on the mounting surface side of the wire portion (line segment BC) where the winding core portion 12 and the flange portion 13 intersect. This is because without the second region 19, the winding 15 cannot be supported on the mounting surface side of the wire portion (line segment BC) where the winding core portion 12 and the flange portion 13 intersect, and the winding 15 cannot be supported. This is because it will loosen. That is, without the second region 19, it would be meaningless to have a corner portion in the entire line segment BC. By providing the wire portion (line segment BC) at which the winding core portion 12 and the flange portion 13 intersect and providing the second region 19 in this way, a common mode choke coil without loose winding can be obtained.
　凹部２０の深さが浅すぎると巻きゆるみ防止の効果が出にくくなるため、凹部２０の深さを巻線１５の線径の半分以上とすることが望ましい。逆に凹部２０の深さを深くしすぎると鍔部１３の強度が弱くなるため、凹部２０の深さを第２領域１９の厚さの半分以下とすることが望ましい。さらには凹部２０の深さを巻線１５の線径以上、第２領域１９の厚さの４分の１以下とすることがより好ましい。 If the depth of the recess 20 is too shallow, the effect of preventing the winding loosening will be difficult to obtain, so it is desirable that the depth of the recess 20 is at least half the wire diameter of the winding 15. On the contrary, if the depth of the recess 20 is made too deep, the strength of the flange portion 13 becomes weak, so it is desirable that the depth of the recess 20 is less than half the thickness of the second region 19. Further, it is more preferable that the depth of the recess 20 is not less than the wire diameter of the winding 15 and not more than a quarter of the thickness of the second region 19.
　また凹部２０は巻芯部１２から離れるにしたがって厚さが薄くなるテーパ状にすることが望ましい。具体的には、巻芯部１２付近の第１領域１８の厚さよりも、実装面２１付近の第１領域１８の厚さが約０．０３ｍｍ薄くなるようにして、この間が直線的に変化するようにテーパを設ける。一方、第２領域１９はこのテーパを設けずに平行の状態とする。このようにすることによりフェライト粉体にバインダーを混ぜてプレス成型したときに金型から抜きやすくなり量産性を向上させることができる。 Further, it is desirable that the concave portion 20 has a tapered shape in which the thickness becomes thinner as the distance from the winding core portion 12 increases. Specifically, the thickness of the first region 18 near the mounting surface 21 is set to be about 0.03 mm thinner than the thickness of the first region 18 near the winding core portion 12, and this period changes linearly. A taper is provided so as to. On the other hand, the second region 19 is in a parallel state without providing this taper. By doing so, when the binder is mixed with the ferrite powder and press-molded, it becomes easy to remove from the mold and mass productivity can be improved.
　（３）変形例
　上記一実施形態におけるコモンモードチョークコイル１０の変形例として、以下の図６～図１１を用いて説明する。図６に変形例にかかるコモンモードチョークコイル１０の側面を模式的に示す。なお、各変形例においてコモンモードチョークコイル１０として、磁性コア１１、巻芯部１２、鍔部１３および巻線１５は共通である。また、巻芯部１２は柱状の形状を有する点で、各変形例において共通である。そこで、以下の変形例では、鍔部１３の主面の形状を示すことにより説明する。なお、各変形例において、鍔部１３の主面の中央領域２５および周辺領域２６は共通である。また、交点Ｂ、交点Ｃおよび直線Ｌｆも共通であるので図示するにとどめ、詳細を説明しない。凹部２０についても共通であるので必要以外は図示するにとどめる。以下に説明する図面にて示すが、第１領域１８は線分ＢＣを一辺に有し、第２領域１９は、第１領域１８に隣接する。また、第１領域１８、第２領域１９は、直線Ｌｆを境界として、実装面２１へ向かう方向に設けられている。 (3) Modification Example A modification of the common mode choke coil 10 in the above embodiment will be described with reference to FIGS. 6 to 11 below. FIG. 6 schematically shows the side surface of the common mode choke coil 10 according to the modified example. In each modification, the magnetic core 11, the winding core portion 12, the flange portion 13, and the winding 15 are common as the common mode choke coil 10. Further, the winding core portion 12 has a columnar shape, which is common to each modification. Therefore, in the following modification, the shape of the main surface of the collar portion 13 will be described. In each modification, the central region 25 and the peripheral region 26 of the main surface of the collar portion 13 are common. Further, since the intersection point B, the intersection point C, and the straight line Lf are also common, they are shown only and will not be described in detail. Since the recess 20 is also common, it is shown only if it is not necessary. As shown in the drawings described below, the first region 18 has a line segment BC on one side, and the second region 19 is adjacent to the first region 18. Further, the first region 18 and the second region 19 are provided in the direction toward the mounting surface 21 with the straight line Lf as a boundary.
　（３－１）第１変形例
　第１変形例におけるコモンモードチョークコイル１０は、図１に示すのと同様の四角柱状の巻芯部１２を用いている。図７に示すように、鍔部１３の主面において第１領域１８は、中央領域２５から実装面２１へ向かうにつれて広がった台形形状を有する。なお、第１領域１８および第２領域とも実装面２１に接する。 (3-1) First Modified Example The common mode choke coil 10 in the first modified example uses a square columnar winding core portion 12 similar to that shown in FIG. As shown in FIG. 7, the first region 18 on the main surface of the collar portion 13 has a trapezoidal shape that expands from the central region 25 toward the mounting surface 21. Both the first region 18 and the second region are in contact with the mounting surface 21.
　この第１変形例におけるコモンモードチョークコイル１０は、上記一実施形態にかかるコモンモードチョークコイル１０と同様の効果を有する。 The common mode choke coil 10 in this first modification has the same effect as the common mode choke coil 10 according to the above embodiment.
　（３－２）第２変形例
　第２変形例におけるコモンモードチョークコイル１０は、図１に示すのと同様の四角柱状の巻芯部１２を用いている。図８に示すように、鍔部１３の主面において第１領域１８は、中央領域２５から実装面２１へ向かうにつれて狭い台形形状を有する。なお、第１領域１８および第２領域とも実装面２１に接する。 (3-2) Second Modified Example The common mode choke coil 10 in the second modified example uses a square columnar winding core portion 12 similar to that shown in FIG. As shown in FIG. 8, the first region 18 on the main surface of the collar portion 13 has a narrow trapezoidal shape from the central region 25 toward the mounting surface 21. Both the first region 18 and the second region are in contact with the mounting surface 21.
　この第２変形例におけるコモンモードチョークコイル１０は、上記一実施形態にかかるコモンモードチョークコイル１０と同様の効果を有する。 The common mode choke coil 10 in this second modification has the same effect as the common mode choke coil 10 according to the above embodiment.
　ここで、第１変形例および第２変形例のコモンモードチョークコイル１０と、図４に示す長方形状の第１領域１８を有する上記一実施形態のコモンモードチョークコイル１０とを比較する。 Here, the common mode choke coil 10 of the first modification and the second modification is compared with the common mode choke coil 10 of the above embodiment having the rectangular first region 18 shown in FIG.
　上記一実施形態における長方形の第１領域１８は、第１変形例における第１領域１８と比べ、第２領域１９の面積が大きくなる。そのため、上記一実施形態における長方形の第１領域１８のほうが第１変形例における第１領域１８と比べ、巻線１５を支える領域を広くすることができる。そのため、上記一実施形態にかかるコモンモードチョークコイル１０は、第１変形例にかかるコモンモードチョークコイル１０と比べ、巻線１５のゆるみをより防止することができる。 The rectangular first region 18 in the above embodiment has a larger area of the second region 19 than the first region 18 in the first modification. Therefore, the rectangular first region 18 in the above embodiment can have a wider region for supporting the winding 15 than the first region 18 in the first modification. Therefore, the common mode choke coil 10 according to the above embodiment can further prevent loosening of the winding 15 as compared with the common mode choke coil 10 according to the first modification.
　また、上記一実施形態における長方形の第１領域１８は、第２変形例における第１領域１８と比べ、交点Ｂおよび交点Ｃ近傍の第２領域１９の面積を小さくできる。そのため、上記一実施形態における長方形の第１領域１８は、第２変形例における第１領域１８と比べ、巻線１５を支える巻芯部１２と鍔部１３との接合に伴う盛り上がり２３の影響をより小さくできる。よって、上記一実施形態における長方形状の第１領域１８は、第２変形例における第１領域１８と比べ、巻線１５の浮き上がりをより少なくできる。結果として、上記一実施形態にかかるコモンモードチョークコイル１０は、第２変形例にかかるコモンモードチョークコイル１０と比べ、巻線１５のゆるみをより防止することができる。 Further, the rectangular first region 18 in the above embodiment can make the area of the second region 19 near the intersection B and the intersection C smaller than that of the first region 18 in the second modification. Therefore, the rectangular first region 18 in the above embodiment is affected by the swelling 23 due to the joining between the winding core portion 12 supporting the winding 15 and the flange portion 13 as compared with the first region 18 in the second modification. Can be smaller. Therefore, the rectangular first region 18 in the above embodiment can reduce the lift of the winding 15 as compared with the first region 18 in the second modification. As a result, the common mode choke coil 10 according to the above embodiment can further prevent loosening of the winding 15 as compared with the common mode choke coil 10 according to the second modification.
　以上より、上記一実施形態における長方形状の第１領域１８が最適であることがわかる。この長方形状の第１領域１８は、主面２４（第２領域１９）に垂直な方向から見て線分ＢＣを実装面２１へ向けて射影した領域である。 From the above, it can be seen that the rectangular first region 18 in the above embodiment is optimal. The rectangular first region 18 is a region in which the line segment BC is projected toward the mounting surface 21 when viewed from a direction perpendicular to the main surface 24 (second region 19).
　（３－３）第３変形例
　第３変形例におけるコモンモードチョークコイル１０は、図１に示すのと同様の四角柱状の巻芯部１２を用いている。図９に示すように、鍔部１３の主面において第１領域１８は、線分ＢＣに沿った長方形状の溝である凹部２０を有する。 (3-3) Third Modified Example The common mode choke coil 10 in the third modified example uses a square columnar winding core portion 12 similar to that shown in FIG. As shown in FIG. 9, the first region 18 on the main surface of the collar portion 13 has a recess 20 which is a rectangular groove along the line segment BC.
　この第３変形例におけるコモンモードチョークコイル１０は、上記一実施形態にかかるコモンモードチョークコイル１０と同様の効果を有する。 The common mode choke coil 10 in this third modification has the same effect as the common mode choke coil 10 according to the above embodiment.
　なお、凹部２０の深さが浅すぎると巻きゆるみ防止の効果が出にくくなるため、凹部２０の深さを巻線１５の線径の半分以上とすることが望ましい。逆に凹部２０の深さを深くしすぎると鍔部１３の強度が弱くなるため、凹部２０の深さを第２領域１９の厚さの半分以下とすることが望ましい。さらには凹部２０の深さを巻線１５の線径以上、第２領域１９の厚さの４分の１以下とすることがより好ましい。また、凹部２０の実装面２１に向かう方向の幅は、巻線１５の太さ以上であることが好ましい。 If the depth of the recess 20 is too shallow, the effect of preventing the winding loosening will be difficult to obtain. Therefore, it is desirable that the depth of the recess 20 is at least half the wire diameter of the winding 15. On the contrary, if the depth of the recess 20 is made too deep, the strength of the flange portion 13 becomes weak, so it is desirable that the depth of the recess 20 is less than half the thickness of the second region 19. Further, it is more preferable that the depth of the recess 20 is not less than the wire diameter of the winding 15 and not more than a quarter of the thickness of the second region 19. Further, the width of the recess 20 in the direction toward the mounting surface 21 is preferably equal to or larger than the thickness of the winding 15.
　（３－４）第４変形例
　第４変形例におけるコモンモードチョークコイル１０は、五角柱の巻芯部１２を用いている。図１０に示すように、鍔部１３の主面において第１領域１８は、五角形の一辺である線分ＢＣに沿った長方形状の凹部２０を有する。 (3-4) Fourth Modified Example The common mode choke coil 10 in the fourth modified example uses a winding core portion 12 of a pentagonal prism. As shown in FIG. 10, in the main surface of the collar portion 13, the first region 18 has a rectangular recess 20 along the line segment BC which is one side of the pentagon.
　この第４変形例におけるコモンモードチョークコイル１０は、上記一実施形態にかかるコモンモードチョークコイル１０と同様の効果を有する。 The common mode choke coil 10 in the fourth modification has the same effect as the common mode choke coil 10 according to the above embodiment.
　なお、巻芯部１２として三角柱や六角以上の角を有する角柱を用いることもできる。 It should be noted that a triangular prism or a prism having a hexagonal or more angle can be used as the winding core portion 12.
　（３－５）第５変形例
　第５変形例におけるコモンモードチョークコイル１０は、線分ＢＣを含む面を切り欠き部とする円柱の巻芯部１２を用いている。図１１に示すように、鍔部１３の主面において第１領域１８は、切り欠き部である線分ＢＣに沿った長方形状の凹部２０を有する。 (3-5) Fifth Deformation Example The common mode choke coil 10 in the fifth modification uses a cylindrical winding core portion 12 having a surface including the line segment BC as a notch portion. As shown in FIG. 11, the first region 18 on the main surface of the collar portion 13 has a rectangular recess 20 along the line segment BC which is a notch portion.
　この第５変形例におけるコモンモードチョークコイル１０は、上記一実施形態にかかるコモンモードチョークコイル１０と同様の効果を有する。 The common mode choke coil 10 in the fifth modification has the same effect as the common mode choke coil 10 according to the above embodiment.
　なお、線分ＢＣを含む面を切り欠き部とする円柱以外に、線分ＢＣを含む面を切り欠き部とする楕円の断面を有する柱を用いてもよく、楕円以外にも線分ＢＣを含む面を切り欠き部とする閉曲面の断面を有する柱を用いてもよい。 In addition to the cylinder whose cutout portion is the surface including the line segment BC, a column having an elliptical cross section whose cutout portion is the surface including the line segment BC may be used, and the line segment BC may be used in addition to the ellipse. A cylinder having a closed curved cross section having a cutout portion on the including surface may be used.
　本開示に係るコモンモードチョークコイルは、巻線のゆるみを防止し、モード変換特性に優れたコモンモードチョークコイルを得ることができ、産業上有用である。 The common mode choke coil according to the present disclosure is industrially useful because it can prevent loosening of windings and can obtain a common mode choke coil having excellent mode conversion characteristics.
　１０　コモンモードチョークコイル
　１１　磁性コア
　１２　巻芯部
　１３　鍔部
　１４　磁性板
　１５　巻線
　１５ａ、１５ｂ　導線
　１５ｃ、１５ｄ　端部
　１７　外部電極
　１８　第１領域
　１９　第２領域
　２０　凹部
　２１　実装面
　２２　つなぎ部分
　２３　盛り上がり
　２４　主面
　２５　中央領域
　２６　周辺領域
　Ｌｅ　側線
　Ｌｆ　直線 10 Common mode choke coil 11 Magnetic core 12 Winding core 13 Flange 14 Magnetic plate 15 Winding 15a, 15b Leads 15c, 15d End 17 External electrode 18 1st area 19 2nd area 20 Recess 21 Mounting surface 22 Connecting part 23 Rise 24 Main surface 25 Central area 26 Peripheral area Le Side line Lf straight line

Claims (6)

  1. 　第１の方向に延びる柱状の巻芯部及び前記巻芯部の両端に各々設けられた一対の鍔部を有し、前記一対の鍔部の各々に主面と実装面とが設けられた磁性コアと、
    　前記一対の鍔部の各々に、各々設けられた一対の外部電極と、
    　前記巻芯部に巻回される２本の巻線と、
    　前記一対の鍔部の前記実装面と反対の面に接合された磁性板と、を備え、
    　前記２本の巻線の各々の一端は、前記一対の鍔部の一方に設けられた前記一対の外部電極の一方に接合され、前記２本の巻線の各々の他端は、前記一対の鍔部の他方に設けられた前記一対の外部電極の他方に接合され、
    　前記一対の鍔部の各々は、互いに対向する主面を備え、前記主面は、前記巻芯部と接する中央領域と、前記中央領域の周囲に配置された周辺領域とを有し、
    　前記周辺領域は、前記中央領域に接し、前記中央領域から前記実装面に向かって延びる第１領域と、前記第１領域に隣接しかつ前記実装面からみて前記中央領域より手前方向へ延びる第２領域とを有し、
    　前記第１の方向における前記第１領域の厚さが前記第２領域の厚さよりも薄い、コモンモードチョークコイル。     It has a columnar winding core portion extending in the first direction and a pair of flange portions provided at both ends of the winding core portion, and each of the pair of flange portions is provided with a main surface and a mounting surface. With the core
    A pair of external electrodes provided on each of the pair of collars,
    Two windings wound around the core,
    A magnetic plate joined to a surface opposite to the mounting surface of the pair of collar portions is provided.
    One end of each of the two windings is joined to one of the pair of external electrodes provided on one of the pair of collars, and the other end of each of the two windings is the pair. Joined to the other of the pair of external electrodes provided on the other side of the collar
    Each of the pair of collar portions has a main surface facing each other, and the main surface has a central region in contact with the winding core portion and a peripheral region arranged around the central region.
    The peripheral region is a first region that is in contact with the central region and extends from the central region toward the mounting surface, and a second region that is adjacent to the first region and extends toward the front of the central region when viewed from the mounting surface. Has an area and
    A common mode choke coil in which the thickness of the first region in the first direction is thinner than the thickness of the second region.
  2. 　前記第１領域に凹部を設けることにより、前記第１領域の厚さを前記第２領域の厚さよりも薄くした、請求項１記載のコモンモードチョークコイル。 The common mode choke coil according to claim 1, wherein the thickness of the first region is made thinner than the thickness of the second region by providing a recess in the first region.
  3. 　前記第２領域の厚さから前記第１領域の厚さを減じた値を、前記２本の巻線の各々の線径の半分以上、前記第２領域の厚さの半分以下とした、請求項２記載のコモンモードチョークコイル。 Claimed that the value obtained by subtracting the thickness of the first region from the thickness of the second region is equal to or more than half the wire diameter of each of the two windings and not more than half the thickness of the second region. Item 2. The common mode choke coil according to item 2.
  4. 　前記第２領域の厚さから前記第１領域の厚さを減じた値を、前記２本の巻線の各々の線径以上、前記第２領域の厚さの４分の１以下とした、請求項３記載のコモンモードチョークコイル。 The value obtained by subtracting the thickness of the first region from the thickness of the second region was set to be equal to or larger than the wire diameter of each of the two windings and not more than a quarter of the thickness of the second region. The common mode choke coil according to claim 3.
  5. 　前記第１領域は、前記中央領域から離れるにしたがって前記第１領域の厚さが薄くなるテーパ状になっている、請求項１記載のコモンモードチョークコイル。 The common mode choke coil according to claim 1, wherein the first region has a tapered shape in which the thickness of the first region becomes thinner as the distance from the central region increases.
  6. 　前記周辺領域を形成する辺を含みかつ前記巻芯部の側面が平面であり、前記平面と前記第２領域とのなす角度が９０度である、請求項１記載のコモンモードチョークコイル。 The common mode choke coil according to claim 1, wherein the side surface of the winding core portion is a flat surface, and the angle formed by the flat surface and the second region is 90 degrees, including the side forming the peripheral region.
PCT/JP2020/019152 2019-06-19 2020-05-13 Common-mode choke coil WO2020255593A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0444109U (en) * 1990-08-21 1992-04-15
JP2000150282A (en) * 1998-11-12 2000-05-30 Taiyo Yuden Co Ltd Core for chip coil and its manufacture
JP2012028684A (en) * 2010-07-27 2012-02-09 Tdk Corp Common mode filter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0444109U (en) * 1990-08-21 1992-04-15
JP2000150282A (en) * 1998-11-12 2000-05-30 Taiyo Yuden Co Ltd Core for chip coil and its manufacture
JP2012028684A (en) * 2010-07-27 2012-02-09 Tdk Corp Common mode filter

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