JP2008034777A - Common mode choke coil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact common mode choke coil having high impedance even in a high frequency region by suppressing generation of large stray capacitance between winding wires of adjoining turns. <P>SOLUTION: In the common mode choke coil 10, a spindle 13 includes: a drum core 11; pairs of electrodes 14 separately formed at a periphery of one flange and a periphery of the other flange of the core, respectively; and a pair of wires 15 whose beginning ends are connected to the different electrodes of one flange, respectively, and wound at a plurality of turns around the spindle while closely contact to each other, and whose termination ends are connected to the different electrodes of the other flange, respectively. A crossing C where the pair of wires 15 cross to each other is provided to at least one point out of the wires wound at the plurality of turns around the spindle 13. Some turns of one wire constituting the crossing C adjoin each other in less than one turn before or after the crossing C. Consequently, since wires of the same electrode adjoin each other, stray capacitance can be decreased between the wires of the adjoining turns. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a common mode choke coil used for removing common mode noise passing through signal lines of various electronic devices.

  A conventional common mode choke coil is generally formed by winding a pair of conductive wires covered with an insulator around a winding axis of a drum core in a plurality of turns in a flat manner. Specifically, there is the following Patent Document 1 as a bifilar wound of a pair of conducting wires. Further, as shown in FIG. 8, there is the following Patent Document 2 in which a pair of wires is wound around a pair of conducting wires.

JP2003-158021 JP 2004-146683 A

In recent years, there has been a growing demand for high-speed and large-capacity information to be exchanged through signal lines in connection between various peripheral devices and networks and personal computers, and input / output circuits such as high-density displays.
In addition, there is an increasing demand for miniaturization and / or thinning of these electronic devices, and there is a demand for miniaturization of electronic components mounted on these electronic devices.
However, in order to obtain the same level of electrical characteristics as in conventional winding-type common mode choke coils, a pair of conductors is installed around the winding core of a drum-type core that is smaller than conventional ones with the number of turns equal to or higher than conventional ones. Will be wound. For this reason, in the case where a pair of conductors or a pair of conductors are wound around the winding axis of the drum-type core as described above and wound by a plurality of turns in a flat manner, one conductor of the pair of conductors is adjacent to The distance between the conductors of the pair of conductors in the turn is close and a large stray capacitance is generated between the conductors. For this reason, the subject that it became difficult to obtain high characteristic impedance occurred.

  An object of the present invention is to provide a common type having a high characteristic impedance by suppressing generation of a large stray capacitance between conductive wires of adjacent turns in a winding type common mode choke coil used for various small and thin electronic devices. It is to provide a mode choke coil.

In order to achieve the above object, the present invention provides:
(1) A drum core having a winding shaft and one and other flanges provided at one and the other ends of the winding shaft so as to be orthogonal to the winding shaft, and the one flange of the drum core A pair of electrodes formed independently of each other on the peripheral portion of the drum core and the peripheral portion of the other flange, and a starting end connected to different electrodes of the first flange of the drum core, and the drum core A common mode choke coil having a pair of conductive wires wound around a winding axis in close contact with each other and terminated at different electrodes of the other rod,
An intersection where the pair of conductors intersect is provided in at least one of the conductors wound around the winding axis of the drum core, and any one of the conductors constituting the intersection is It is wound so as to be adjacent to each other in less than one turn before and after the intersection (hereinafter referred to as first problem solving means).

One of the main forms is
(2) The winding axis of the drum-type core has a rectangular cross section orthogonal to the winding axis, and the crossing portion is provided on one surface of the winding shaft, and any one of the conductive wires constituting the crossing portion They are characterized by being adjacent to each other on the remaining three surfaces (hereinafter referred to as second problem solving means).

One of the other main forms is
(3) The intersecting portions are respectively provided in two adjacent turns of the pair of conducting wires (hereinafter referred to as third problem solving means).

One of the other forms is
(4) The intersection is provided for each turn of the pair of conductive wires (hereinafter referred to as fourth problem solving means).

One of the other forms is
(5) The pair of conductors are provided with a plurality of intersections, and any one of the plurality of intersections sandwiches the other conductor between the winding surface and the outside of each of the plurality of intersections. It is characterized by intersecting (hereinafter referred to as fifth problem solving means).

  The operation of the first problem solving means is as follows. That is, any one of the conductors constituting the intersecting portion is provided by providing an intersecting portion where the pair of conducting wires intersect at least at one place among the conducting wires wound around the winding axis of the drum core. Are wound so as to be adjacent to each other in less than one turn before and after the crossing portion, so that the conductors of the same polarity are adjacent to each other, and the voltage difference between the conductors is reduced. The resulting stray capacitance is reduced.

  The operation of the second problem solving means is as follows. That is, the winding axis of the drum-type core has a rectangular cross section orthogonal to the winding axis, the crossing portion is provided on one surface of the winding shaft, and any one of the conductive wires constituting the crossing portion Are adjacent to each other on the remaining three surfaces, the positions of the adjacent portions of the pair of conductive wires and the positions of the intersections are respectively specified, and the region where the same conductive wires of about 3/4 turns are adjacent to each other can be stably obtained. Variation in characteristic impedance is reduced.

  The operation of the third problem solving means is as follows. That is, since the intersecting portions are respectively provided in two turns adjacent to each other of the pair of conducting wires, the same conducting wires are adjacent to each other before and after the intersecting portion in each of the pair of conducting wires. For this reason, when the stray capacitance is reduced in each of the pair of conductors, the self-resonance frequency is increased and the effect of removing common mode noise is increased.

  The operation of the fourth problem solving means is as follows. That is, since the intersection is provided for each turn of the pair of conductive wires, a large stray capacitance reduction effect can be obtained.

  The operation of the fifth problem solving means is as follows. That is, the pair of conductors includes a plurality of intersections, and any one of the plurality of intersections intersects the outer surface of the winding shaft with the other conductor between each of the plurality of intersections. Therefore, it can be manufactured inexpensively with simple winding means. Specifically, when using a pair of wires or winding a pair of conductors simultaneously, the core and the wire supply means can be wound without applying a relatively continuous twist, A large-scale winding facility for eliminating twisting of the conductive wire is not required. In addition, when winding a pair of conductors in two degrees, that is, the winding wire intersects with the one conductor after one of the pair of conductors is wound in advance around the drum core winding shaft. When winding the other of a pair of conducting wires, it can manufacture with the winding machine of one winding nozzle used for manufacture of a general coil.

  As described above, the present invention suppresses the generation of a large stray capacitance between conductive wires of adjacent turns in a wound-type common mode choke coil used for various small and thin electronic devices, and provides a high characteristic impedance. A common mode choke coil can be provided.

  Hereinafter, a first embodiment of a common mode choke coil of the present invention will be described with reference to FIGS. FIG. 1 is an external perspective view showing the overall structure of the common mode choke coil 10 of the first embodiment. 2A and 2B are views for explaining the internal structure of the first embodiment. FIG. 2A is a partially transparent plan view, and FIG. 2B is a bottom view. FIG. 3 is a diagram for explaining an example of the manufacturing process of the common mode choke coil 10 of the first embodiment, and FIGS. 3A to 3E are bottom views following the manufacturing process. FIG. FIG. 4 is an explanatory diagram showing an example of a measuring apparatus used to obtain the characteristic impedance of the common mode choke coil of the present embodiment. FIG. 5 is a graph showing the results of obtaining the characteristic impedances of the common mode choke coil 10 of the example of the present embodiment and the common mode choke coil of the comparative example.

  As shown in FIG. 1, the overall structure of the common mode choke coil 10 of this embodiment is such that a pair of conducting wires 15 are wound about four turns around a winding shaft 13 having a rectangular cross section orthogonal to the axis of the drum core 11. In addition, a plate-like closed magnetic path forming core 19 is fixed to the upper surface of the flange 12 of the drum-type core 11. In addition, a pair of leg portions 12A1 and 12B1 is provided on the peripheral portion of one flange 12 of the drum core 11, and a pair of leg portions 12A2 is provided on the peripheral portion of the other flange 12 of the drum core 11. , 12B2 are provided. Electrodes 14A1, 14B1, 14A2, and 14B2 are provided at the tips of the respective leg portions 12A1, 12B1, 12A2, and 12B2.

  Specifically, a drum core 11 having a winding shaft 13 and one and other flanges 12 and 12 provided at one and the other end of the winding shaft 13 so as to be orthogonal to the winding shaft 13; A pair of electrodes 14 formed independently of each other on the periphery of the one flange 12 of the drum core 11 and the periphery of the other flange 12, respectively, and each of the one flange 12 of the drum core 11 The starting ends are connected to different electrodes 14A1 and 14B1, and are wound around the winding shaft 13 of the drum-type core 11 in a plurality of turns, and the ends are connected to different electrodes 14A2 and 14B2 of the other flange 12, respectively. A common mode choke coil 10 having a pair of conducting wires 15A and 15B, and at least one of the conducting wires 15 wound around the winding shaft 13 of the drum core 11 for a plurality of turns. An intersection C where the pair of conductors 15A and 15B intersect is provided at a place, and any one of the conductors constituting the intersection C is wound so as to be adjacent to each other in less than one turn before and after the intersection C. It is what.

  In the first embodiment, the winding core 13 of the drum-type core has a rectangular cross section orthogonal to the winding shaft 13, and the intersection C is provided on one surface of the winding shaft 13. Any one of the conducting wires constituting the intersection C is adjacent on the remaining three surfaces of the winding shaft 13.

  Further, in the first embodiment, the intersecting portions C are provided on two adjacent turns of the pair of conductive wires 15A and 15B, respectively.

  In the first embodiment, the intersection C is provided for each turn of the pair of conductors 15A and 15B.

  In the first embodiment, the pair of conductors 15A and 15B includes a plurality of intersections C, and one of the conductors (15B in the present embodiment) includes the plurality of intersections C1, C2, and the like. In each of C3 and C4, the other conducting wire (15A in this embodiment) is sandwiched between the surface of the winding shaft 13 so as to get over the outside.

Specifically, a pair of conducting wires 15A and 15B are wound around the winding shaft 13 of the drum core 11 for four turns T1 to T4. The leading end of one conductor 15A is connected to the electrode 14A1 at the tip of the leg 12A1 provided on the periphery of one flange 12 of the drum core 11, and the end of the conductor 15A is the other flange of the drum core 11. 12 is connected to the electrode 14A2 at the tip of the leg 12A2 provided on the peripheral portion. Similarly, the starting end of the other conducting wire 15B is connected to the electrode 14B1 at the tip of the leg portion 12B1 provided on the periphery of the one flange 12 of the drum core 11, and the terminating end of the conducting wire 15B is the end of the drum core 11. The other end of the leg 12 is connected to the electrode 14B2 at the tip of the leg 12B2.
The pair of conducting wires 15 includes a winding shaft 13 of the drum-type core 11 having a rectangular cross section orthogonal to the winding shaft 13, and one on each of the turns T <b> 1 to T <b> 4 on the bottom surface side of the winding shaft 13. Intersections C1 to C4 where the pair of conductors 15A and 15B intersect with each other are provided. In the present embodiment, one of the pair of conductive wires 15A and 15B (15B in the present embodiment) is connected to the surface of the winding shaft 13 at each of the intersecting portions C1 to C4. The conductors (15A in this embodiment) cross each other so as to get over the outside.
The winding axis 13 of the drum core 11 has a rectangular cross section orthogonal to the axis, and the intersection C is provided on the bottom surface of the winding axis 13, and any one of the intersections C is formed. The conducting wires are adjacent to each other on the remaining three surfaces of the winding shaft 13.
Specifically, the first turn T1 of the pair of conductors 15 is provided with an intersection C1 on the bottom surface, and the first lead before the intersection C1 of the other conductor 15B constituting the intersection C1. The conducting wire 15B1 of the turn T1 and the other conducting wire 15B2 of the second turn T2 after the intersection C1 are adjacent to each other on the remaining three surfaces of the winding shaft 13.
Further, the second turn T2 adjacent to the first turn T1 is provided with an intersection C2 similarly to the first turn. And the conducting wire 15A2 of the second turn T2 before the intersecting portion C2 of one conducting wire 15A constituting the intersecting portion C2 and the one conducting wire 15A3 of the third turn T3 after the intersecting portion C2 The remaining three surfaces of the rectangular winding shaft 13 are adjacent to each other.
Further, the third turn T3 adjacent to the second turn T2 is provided with an intersection C3 as in the first turn. And the conducting wire 15B3 of the third turn T3 before the intersecting portion C3 of the other conducting wire 15B constituting the intersecting portion C3 and the other conducting wire 15B4 of the fourth turn T4 after the intersecting portion C3 are provided. The remaining three surfaces of the rectangular winding shaft 13 are adjacent to each other.
In the common mode choke coil 10 of the present embodiment, either one of the conductive wires (15B in the present embodiment) is connected to the intersection C1 of the first turn T1 and the intersection of the second turn T2 adjacent thereto. C2 is common in that it intersects with the surface of the winding shaft 13 so as to get over the outside with the other conducting wire (15A in this embodiment) interposed therebetween. With this configuration, in the common mode choke coil 10 of the present embodiment, the drum core and the supply means such as the winding nozzle of the winding machine are relatively moved according to the winding of a plurality of turns. There is no need to continuously twist. For this reason, one conducting wire 15A and the other conducting wire 15B can be divided into two portions and wound by one inexpensive winding machine. Even when a winding machine having a pair of winding nozzles is used, the winding can be performed only by relatively moving the drum core and the pair of nozzles at an angle of about 180 ° C. The advantage of avoiding the increase in size and complexity.

  The drum core 11 of the common mode choke coil 10 can be appropriately selected from high permeability insulating materials mainly composed of Ni-Zn ferrite, Ni-Zn-Cu ferrite, etc. Insulating material powder and binder are mixed and granulated, then molded into a predetermined shape using a powder molding press, debindered at around 800 ° C., and then predetermined according to the sintering temperature of each insulating material It is obtained by firing at a temperature of Further, the drum core 11 is not limited to the high magnetic permeability insulating material as described above, but is made of a low magnetic resistance material such as a powder of the high magnetic permeability insulating material, Mn-Zn ferrite, or a metal magnetic material. It is also possible to use a drum core made of a resin composite material obtained by mixing powder and an insulating resin such as an epoxy resin and molding the mixture in a mold having a predetermined shape. The drum core 11 preferably has a drum shape in which the flanges 12 are formed integrally with or separately from the winding shaft 13 at both ends of the winding shaft 13 around which the conducting wire 15 is wound. In addition, a drum-shaped core may be formed by combining the magnetic permeability insulating material and the resin composite material.

  The plate-like closed magnetic path forming core 19 can be made of the same material as the drum core.

In the case of the drum core 11 using a high magnetic permeability insulating material, the electrode 14 provided on the periphery of the flange 12 of the drum core 11 is a baking type electrode material paste containing Ag powder and glass powder. However, the present invention is not limited to this, and a thermosetting conductive paste in which conductive particles such as Ag powder or Ag-Pd powder and epoxy resin are mixed can be used. In the case of the latter thermosetting conductive paste, it can also be applied as a core electrode using the resin composite material.
Further, Cu plating, Ni plating, Sn plating, or the like may be formed on the surface of the electrode 14 as necessary in order to improve connectivity by soldering, thermocompression bonding, or the like.

  As the pair of conductive wires 15 wound around the winding shaft 13 of the drum core 11, a metal wire such as copper coated with polyurethane resin, polyester resin or the like can be used, and the metal wire is a single wire / twisted wire. Any of the lines may be used. Further, the pair of conductive wires 15 may be individually covered with the insulation coating, or the pair of conductive wires 15 may be integrally covered with the insulation coating.

  The connection between the electrode 14 provided on the periphery of the flange 12 of the drum core 11 and the conductive wire 15 is generally by soldering. Moreover, it is not limited to this, You may connect to the surface of the said electrode 14 by thermocompression bonding.

  The intersecting portion C provided in the pair of conductive wires 15 is provided on the bottom side of the drum core 11 around the winding shaft 13 for one turn, but is limited to this. However, it may be provided at any position around the winding shaft 13. Further, a plurality of the intersections C may be provided in one turn.

Next, an example of a manufacturing process of the common mode choke coil 10 of the present embodiment will be described with reference to FIG.
First, a magnetic material powder containing Ni-Zn ferrite as a main component, an organic binder, and a solvent are mixed to prepare a slurry, and the resulting slurry is granulated using a spray dryer, and then using a dry molding press. After molding into a predetermined shape and heating the resulting molded body at 800 ° C. for 30 minutes to remove the binder, it was fired at 1300 ° C. for 3 hours, and as shown in FIG. 13 and a plate-shaped collar 12 provided at the end of the winding shaft 13, and a pair of legs 12A1, 12b1, 12A2, and 12B2 provided on the bottom surface side of the collar 12 respectively. 11 was obtained. In addition, as for the size of each part of the core, the width of the collar 12 is 0.96 mm, the height of the collar including the leg is 0.5 mm, and the axial length including the thickness of the collar 12 at both ends is 1.18 mm. The width of the rectangular winding shaft is 0.72 mm, and the thickness of the winding shaft is 0.27 mm.
Next, as shown in FIG. 3B, a baking type electrode material paste mainly composed of Ag powder is prepared, and the respective leg portions 12A1, 12b1, and 12b1 of the flange 12 of the drum core 11 thus obtained, The electrode material paste is applied to the tips of 12A2 and 12B2 by a transfer method and baked at 650 ° C. for 10 minutes to form a terminal electrode 14. Further, the surface of the terminal electrode 14 is Cu plated and Ni plated by electrolytic plating. , Sn plating was sequentially formed.
Next, as shown in FIG. 3 (C), one end of one conductor 15A (wire diameter 30 μm) of a pair of conductors 15 is connected to one electrode 14A1 provided on the one flange 12 of the drum core 11. After connecting by thermocompression bonding and winding four turns of the first turn (T1) to the fourth turn (T4) around the winding shaft, the other end of the one conducting wire 15A is connected to the other rod 12 And connected to one electrode 14A2 provided on the surface by thermocompression bonding.
Next, as shown in FIG. 3 (D), one end of the other conducting wire 15B (wire diameter 30 μm) of the pair of conducting wires 15 is connected to the other electrode 14B1 provided on the one flange 12 of the drum core 11. After connecting by thermocompression bonding, every time one turn is made around the winding shaft 13, four turns of the first turn (T1) to the fourth turn (T4) are wound so as to cross the one conducting wire 15A. After turning, the other end of the other conductor 15B was connected to the other electrode 14B2 provided on the other flange 12 by thermocompression bonding.
Further, as shown in FIG. 3 (D), for forming a plate-like closed magnetic path made of a high magnetic permeability magnetic material similar to that of the drum core so as to be in contact with the upper surface side of the pair of flanges 12 of the drum core 11. The core 19 was fixed with an epoxy insulating adhesive to obtain the common mode choke coil 10 of the present embodiment shown in FIG.

  FIG. 4 shows the common mode choke coil 10 of the present embodiment obtained above and the common mode choke coil of the comparative example obtained in the same manner as described above except that the intersection C is not provided in the pair of conductive wires. As shown in the figure, a Tektronix oscilloscope (TDS8200) 101 is equipped with a TDR (Time Domain Reflectometry) sampling module (80E04) 102, a 50 Ω terminated measuring jig 103 is connected with an SMA cable 104, and a TDR waveform is measured. The result of obtaining the characteristic impedance from FIG. 5 is shown in FIG. In FIG. 5, the solid line indicates the measurement result of the example of the present invention, and the broken line indicates the measurement result of the comparative example.

  As shown in FIG. 5, the common mode choke coil 10 of the example of the present embodiment has a higher characteristic common impedance than the common mode choke coil of the conventional example.

  Next, a second embodiment of the common mode choke coil of the present invention will be described with reference to FIG. 6A and 6B are diagrams showing the internal structure of the common mode choke coil 20 according to the second embodiment. FIG. 6A is a partially transparent plan view, and FIG. 6B is a bottom view.

  As shown in FIG. 6, the entire structure of the common mode choke coil 20 of the present embodiment has a pair of conductive wires 25 integrally insulated around a winding shaft 23 whose section perpendicular to the axis of the drum core 21 is rectangular. The paired wire is wound about 4 turns, and a plate-shaped closed magnetic path forming core 29 is fixed to the upper surface of the flange 22 of the drum core 21. In addition, a pair of leg portions is provided on each of the peripheral portions of the one and other flanges 22 of the drum core 21. Further, electrodes 24A1, 24B1, 24A2, and 24B2 are provided at the tips of the respective leg portions.

  Specifically, a drum core 21 having a winding shaft 23 and one and other flanges 22, 22 provided so as to be orthogonal to the winding shaft 23 at one and the other end of the winding shaft 23, A pair of electrodes 24 formed independently of each other on the periphery of the one flange 22 of the drum core 21 and the periphery of the other flange 22, respectively, and each of the one flange 22 of the drum core 21 The starting ends are connected to different electrodes 24A1, 24B1, and wound around the winding shaft 23 of the drum-type core 21 by multiple turns, and the ends are connected to different electrodes 24A2, 24B2 of the other rod 22, respectively. A common mode choke coil 20 having a pair of conductive wires 25A and 25B, and at least one of the conductive wires 25 wound around the winding shaft 23 of the drum core 21 by a plurality of turns. An intersection C where the pair of conductors 25A and 25B intersect is provided at a place, and any one of the conductors constituting the intersection C is wound so as to be adjacent to each other in less than one turn before and after the intersection C. It is what.

  In the second embodiment, the winding axis 23 of the drum core has a rectangular cross section orthogonal to the winding axis 23, and the intersection C is provided on one surface of the winding axis 23. Any one of the conducting wires constituting the intersection C is adjacent on the remaining three surfaces of the winding shaft 23.

  Moreover, in the said 2nd Embodiment, the said cross | intersection part C is each provided in two turns adjacent to each other of said pair of conducting wire 25A, 25B.

  In the second embodiment, the intersection C is provided for each turn of the pair of conductors 25A and 25B.

  In the second embodiment, the pair of conductors 25A and 25B includes a plurality of intersections C, and any one of the conductors (25B in the present embodiment) includes the plurality of intersections C1, C2, and C2. In each of C3 and C4, the other conductor (25A in this embodiment) is sandwiched between the surface of the winding shaft 23 so as to cross over the outside.

  The difference between the first embodiment and the second embodiment lies in the use of the paired wires integrally insulated as the pair of conductive wires 25 as described above. Since it is the same as that of 1st Embodiment, description is abbreviate | omitted.

  Next, a third embodiment of the common mode choke coil of the present invention will be described with reference to FIG. 7A and 7B are diagrams showing the internal structure of the common mode choke coil 30 according to the third embodiment. FIG. 7A is a partially transparent plan view, and FIG. 7B is a bottom view.

  As shown in FIG. 7, the overall structure of the common mode choke coil 30 of this embodiment has a pair of conductive wires 35 integrally insulated around a winding shaft 33 whose section perpendicular to the axis of the drum core 31 is rectangular. The paired wire is wound about 4 turns, and a plate-like closed magnetic path forming core 39 is fixed to the upper surface of the flange 32 of the drum core 31. In addition, a pair of leg portions is provided on the peripheral portion of one of the drum cores 31 and the other flange 32, respectively. Further, electrodes 34A1, 34B1, 34A2, and 34B2 are provided at the tips of the respective leg portions.

  Specifically, a drum core 31 having a winding shaft 33 and one and other flanges 32, 32 provided at one and the other end of the winding shaft 33 so as to be orthogonal to the winding shaft 33, A pair of independently formed electrodes 34 on the peripheral portion of the one flange 32 and the peripheral portion of the other flange 32 of the drum core 31, and the one flange 32 of the drum core 31, respectively. The starting ends are connected to different electrodes 34A1 and 34B1, and the ends are connected to different electrodes 34A2 and 34B2 of the other rod 32 by being wound around the winding shaft 33 of the drum core 31 in a plurality of turns. A common mode choke coil 30 having a pair of conducting wires 35A and 35B, and at least one of the conducting wires 35 wound around the winding shaft 33 of the drum core 31 for a plurality of turns. An intersection C where the pair of conductors 35A and 35B intersect is provided at a place, and any one of the conductors constituting the intersection C is wound so as to be adjacent to each other in less than one turn before and after the intersection C. It is what.

  Further, in the third embodiment, the winding shaft 33 of the drum core 31 has a rectangular cross section orthogonal to the winding shaft 33, and the intersection C on three sides of the rectangular cross section of the winding shaft 33. Any one of the conducting wires constituting the is adjacent to each other.

  Moreover, in the said 3rd Embodiment, the said cross | intersection part C is each provided in two turns adjacent to each other of said pair of conducting wire 35A, 35B.

  In the third embodiment, the intersection C is provided for each turn of the pair of conductors 35A and 35B.

  In the third embodiment, the pair of conductors 35A and 35B includes a plurality of intersections C, and one conductor 35A is disposed between the surface of the winding shaft 33 at the intersections C1 and C3. The other conductor 35B crosses the outside with the other conductor 35B sandwiching one conductor 35A between the surfaces of the winding shaft 33 at the intersections C2 and C4. Unlike the second embodiment described above, the other operational effects are the same as those of the second embodiment, and a description thereof will be omitted.

  In each of the first to third embodiments, a drum core having a winding shaft having a rectangular cross section orthogonal to the axis is used. However, the present invention is not limited to this, and the cross section is circular or A drum core with a substantially circular winding shaft can also be used.

  Moreover, in the said 1st-3rd embodiment, although all make a pair of conducting wire 4 turns, this invention is not limited to this, The thing of arbitrary turns number is used according to a use. be able to.

  Moreover, in the said 1st-3rd embodiment, although all provide the intersection part C in each of several turns, it is not limited to this, It intersects only with some turns of several turns A part may be provided.

    The present invention is suitable for a wound-type common mode choke coil used in various small and thin electronic devices.

It is a perspective view which shows 1st Embodiment of the common mode choke coil of this invention. It is the top view and bottom view which show the internal structure of the said 1st Embodiment. It is a bottom view which shows an example of the manufacturing process of the said 1st Embodiment. It is explanatory drawing which shows an example of the measuring apparatus used in order to obtain | require the characteristic impedance of the common mode choke coil of the said 1st Embodiment. It is a figure which shows the result of having calculated | required the characteristic impedance of the common mode choke coil of the said 1st Embodiment. It is the top view and bottom view which show the internal structure of 2nd Embodiment of the common mode choke coil of this invention. It is the top view and bottom view which show the internal structure of 3rd Embodiment of the common mode choke coil of this invention. It is a figure which shows the common mode choke coil of background art.

Explanation of symbols

10: common mode choke coil 11: drum core 12: rod 13: winding shaft 14, 14A1, 14A2, 14B1, 14B2: electrodes 15, 15A, 15B: conductor 19: closed magnetic path forming core 20: common mode choke coil 21 : Drum-type core 22: rod 23: winding shaft 24, 24A1, 24A2, 24B1, 24B2: electrode 25, 25A, 25B: conductor 29: core for forming a closed magnetic circuit 30: common mode choke coil 31: drum-type core 32: rod 33: Winding shaft 34, 34A1, 34A2, 34B1, 34B2: Electrodes 35, 35A, 35B: Conductor 39: Core C for forming a closed magnetic circuit, C1, C2, C3, C4: Intersections T, T1, T2, T2, T3, T4 :turn

Claims (5)

A drum core having a winding shaft and one and other flanges provided at one and other ends of the winding shaft so as to be orthogonal to the winding shaft, and a peripheral portion of the one flange of the drum core A pair of electrodes formed independently of each other on the periphery of the other flange, and a start end connected to different electrodes of the one flange of the drum core, and the winding axis of the drum core In a common mode choke coil having a pair of conductive wires wound in close contact with each other and wound around a plurality of turns and having terminations connected to different electrodes on the other side,
An intersection where the pair of conductors intersect is provided in at least one of the conductors wound around the winding axis of the drum core, and any one of the conductors constituting the intersection is The common mode choke coil is wound so as to be adjacent to each other in less than one turn before and after the intersection.   The winding axis of the drum-type core has a rectangular cross section perpendicular to the winding axis, the crossing portion is provided on one surface of the winding shaft, and any one of the conducting wires constituting the crossing portion is the 2. The common mode choke coil according to claim 1, wherein the common mode choke coil is adjacent on the remaining three surfaces of the winding shaft.   The common mode choke coil according to claim 1, wherein the crossing portions are respectively provided in two turns adjacent to each other of the pair of conductive wires.   The common mode choke coil according to claim 1, wherein the intersection is provided for each turn of the pair of conductive wires.   The pair of conductors includes a plurality of intersecting portions, and any one of the plurality of intersecting portions intersects the outer surface of the winding shaft with the other conductor between the winding shaft surfaces. The common mode choke coil according to any one of claims 1 to 3, wherein the common mode choke coil is provided.

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