JP6795070B2 - Coil parts - Google Patents

Description

The present invention relates to a coil component, and more particularly to a coil component having a structure in which two wires in a twisted state are wound around a winding core portion.

A common mode choke coil is a typical example of a coil component to which the present invention is directed.

For example, in Japanese Patent Application Laid-Open No. 2014-207368 (Patent Document 1) and Japanese Patent No. 5558609 (Patent Document 2), a common wire assembly portion in which two wires are twisted is wound around a winding core portion. The mode choke coil is described.

Japanese Unexamined Patent Publication No. 2014-207368 Japanese Patent No. 5558609

As a future technology, the inventors of the present invention use a structure in which a wire assembly portion in a stranded wire state is wound to improve mode conversion characteristics, and to obtain an unprecedented high inductance value under a certain external constraint. We considered to realize it.

First, simply thinking, it is effective to increase the number of turns of the wire assembly portion in order to realize a high inductance value.

However, when trying to wind the wire assembly portion in the stranded state, the wire assembly is caused by the form of the stranded wire itself, that is, the uneven outer peripheral surface formed by the two wires to be twisted. It is not possible to align the parts neatly on the core without any gaps. In other words, when the wire assembly portion is wound around the winding core portion, wasted space is likely to occur. Therefore, when winding the wire assembly portion around the winding core portion having a predetermined dimension, the number of turns must be reduced as compared with the case where the wires in a single wire state are aligned and wound. .. As a result, it is difficult to obtain a high inductance value.

Therefore, in order to increase the number of turns of the wire assembly portion, it is conceivable to adopt a structure in which the wire assembly portion in the stranded wire state is wound in two or more layers. This will be described below with reference to FIGS. 18 to 20.

It should be noted that FIG. 17 is for explaining an embodiment of a wire assembly portion composed of two wires adopted in the present drawing, and in FIG. 17A, a first wire 41 and a second wire 42 are shown. Is shown in an enlarged front view of the Z-twisted stranded wire 43z, and (B) is an enlarged front view of the stranded wire 43s in which the first wire 41 and the second wire 42 are S-twisted. It is shown in the figure. In the present drawing, the wire assembly portion 44 composed of the first wire 41 and the second wire 42 is the wire assembly portion 44 composed of the first wire 41 and the second wire 42 regardless of whether the stranded wire 43z or the stranded wire 43s is twisted. , Is schematically illustrated in a single wire state as shown in FIG. 17 (C).

In FIGS. 18 and 19, a wire assembly portion 44 composed of first and second wires 41 and 42 wound around the core portion 45 is schematically shown in a cross-sectional view. The number entered in the cross section of the wire assembly portion 44 is a number indicating the turn number of the winding around the winding core portion 45 of the wire assembly portion 44, that is, the turn order number. It should be noted that the entry of the turn order number in each cross section of the wire assembly portion 44 is also adopted in the same type of drawings described later.

In the common mode choke coil 51m shown in FIG. 18, the wire assembly portion 44 contacts the peripheral surface of the winding core portion 45 from the first end portion 46 to the second end portion 47 of the winding core portion 45. In the state, it is wound with a single layer from the first turn (hereinafter, expressed as "turn 1") to the turn 16. On the other hand, in the common mode choke coil 51n shown in FIG. 19, the wire assembly portion 44 is the peripheral surface of the winding core portion 45 from the first end portion 46 to the second end portion 47 of the winding core portion 45. After being wound from turn 1 to turn 16 in contact with the winding core portion 45, it is returned to the vicinity of the first end portion 46 of the winding core portion 45, and an outer layer portion is formed on the outer peripheral side of the inner layer portion consisting of turn 1 to turn 16. It is wound from turn 17 to turn 31.

Here, the present inventors have found that the mode conversion characteristic Sds21 is deteriorated in the common mode choke coil 51n shown in FIG. 19 as compared with the common mode choke coil 51m shown in FIG.

Common mode choke coil 51m (Comparative Example 1) having a single layer and 16 turns of wire assembly portion 44 shown in FIG. 18 and a common mode having two layers and 31 turns of wire assembly portion 44 shown in FIG. In order to evaluate the mode conversion characteristics of the choke coil 51n (Comparative Example 2), FIG. 20 shows an S-parameter, more specifically, a frequency characteristic of Sds21.

As can be seen from FIG. 20, compared with Comparative Example 1 shown by the dotted line, Comparative Example 2 shown by the solid line shows a higher level of Sds21 value, and the mode conversion characteristic is significantly deteriorated. That is, according to Comparative Example 2, it can be easily estimated that the number of turns of the wire assembly portion 44 is larger and a higher inductance value can be obtained as compared with Comparative Example 1, but the mode conversion characteristic is It turned out to be significantly worse.

The same type of problem is not limited to common mode choke coils, but also in coil components such as baluns and transformers that have two wires with wire assembly parts that are wound together around the core in the same direction. Can be encountered.

Therefore, an object of the present invention is to provide a coil component capable of obtaining good mode conversion characteristics while increasing the number of wire turns in order to obtain a high inductance value without simply increasing the outer shape. That is.

The present invention comprises a drum-shaped core having a first and second flanges provided at the first and second ends of the winding core and opposite ends of the winding core, respectively, and winding around the winding core. Aimed at a coil component, comprising first and second wires that are turned and not electrically connected to each other. The first and second wires have wire assembly portions wound together around the core in the same direction.

In order to solve the above-mentioned technical problems in such a coil component, the present invention is characterized in that the wire is wound as follows.

That is, in the present invention, there are first and second aspects, and in common with these aspects, the wire assembly portion has a stranded wire portion in which the first and second wires are twisted together. ,
(A) The inner layer portion wound in contact with the peripheral surface of the winding core portion and the inner layer portion
(B) The outer layer portion wound around the outer peripheral side of the inner layer portion and
(C) An outward transition portion that is transitioned from the inner layer portion to the outer layer portion, and
(D) An inward transition portion that is transitioned from the outer layer portion to the inner layer portion, and
Consists of
The outer layer portion is composed of a wire assembly portion that is pulled out from the intermediate position of the inner layer portion in the winding central axis direction by the outward transition portion and returned to the intermediate position of the inner layer portion by the inward transition portion. It is characterized by including a first outer layer portion.

The first outer layer portion described above contributes to increasing the total number of turns of the first and second wires without simply increasing the outer shape. Further, since the first outer layer portion is composed of a wire assembly portion that is pulled out from the intermediate position of the inner layer portion in the winding center axis direction and returned to the intermediate position, the wires constituting the first outer layer portion. The difference in the number of turn orders between adjacent turns between the aggregate portion and the wire aggregate portion constituting the inner layer portion located inside the aggregate portion should be smaller than that in the case of Comparative Example 2 shown in FIG. Can be done. Therefore, the combined capacitance value of the line capacitance with respect to the common mode signal generated by the first wire and the second wire can also be made smaller than that of Comparative Example 2 shown in FIG.

In this case, the “around the winding core portion” includes not only the portion directly above the winding core portion in contact with the peripheral surface, but also the upper portion of the winding core portion via a member such as a wire. Further, the "intermediate position of the inner layer portion in the winding center axis direction" is an arbitrary position excluding the start end and the end of the inner layer portion, and does not necessarily refer to the central portion of the inner layer portion. Further, the intermediate position may be a range having a spread instead of a point. For example, for the first outer layer portion, the extracted intermediate position and the returned intermediate position do not have to exactly coincide as points. The range from the point to be pulled out to the point to be returned may be the intermediate position.

The first aspect of the present invention is characterized in that no twist is applied to the first and second wires in the outward transition portion and the inward transition portion.

In the second aspect of the present invention, the first and second flanges have at least one surface along the winding central axis, and the coil component is provided on at least one surface of the first collar. A first and second terminal electrode to which one end of the first wire and one end of the second wire are connected, respectively, and the other end of the first wire provided on at least one surface of the second flange portion. The first and second flanges are in contact with the third and fourth terminal electrodes to which the other ends of the second wire and the second wire are connected, respectively, on the opposite side of the first and second flanges from the one surface. It further includes a plate-shaped core passed between the parts. In this case, the outward transition portion and the inward transition portion are made not to exist in the portion of the winding core portion facing the plate-shaped core.

In the second aspect of the present invention, preferably, the outward transition portion and the inward transition portion are not present in both the portion of the winding core portion facing the plate-shaped core and the portion opposite to the plate-shaped core portion. To.

In the present invention, preferably, the wire assembly portion around the winding core portion constitutes the first outer layer portion at a plurality of locations. By doing so, it is possible to increase the number of turns of the wire assembly portion while suppressing deterioration of the mode conversion characteristic, thereby improving the inductance value.

It is also preferable that the outer layer portion further includes a second outer layer portion composed of a wire assembly portion pulled out from the position on the second end side of the inner layer portion by the outward transition portion. The second outer layer portion can also increase the number of turns of the wire assembly portion while suppressing the deterioration of the mode conversion characteristic, thereby improving the inductance value. In the case described above, on the second end side of the second outer layer portion, a wire assembly portion to be wound may be further present immediately above the winding core portion.

In the present invention, in the outer layer portion, even if the wire assembly portion is wound from the first end side to the second end side, conversely, from the second end side to the first end portion. It may be wound toward the side. In particular, in the former case, as compared with the latter case, the number of turns between adjacent turns between the wire assembly portion constituting the outer layer portion and the wire assembly portion constituting the inner layer portion located inside the wire assembly portion is increased. The difference can be made smaller. On the other hand, in the latter case, as compared with the former case, the outward transition portion can be shortened, characteristic variation can be reduced, miniaturization, reliability and manufacturing efficiency can be improved.

In the present invention, it is preferable that there are two or more and five or less outward transition portions around the winding core portion. As the number of outward transition portions increases, the difference in the number of turn orders in the portion where the line capacitance is generated between the inner layer portion and the outer layer portion can be reduced.

In the present invention, the number of turns around the winding core portion of the wire assembly portion is preferably 15 or more. For example, at this time, in a common mode choke coil having a plane dimension of 4.5 mm × 3.2 mm, an inductance value of 50 μH or more can be obtained.

In the present invention, it is preferable that the number of twists per turn is 0.5 or more and 8 or less in the stranded portions of the first and second wires. By setting the number of twists to a certain level or more in this way, the effect of improving the mode conversion characteristics can be enhanced. Further, by setting the number of twists to a certain level or less, the reliability and manufacturing efficiency of the coil parts can be ensured.

It is preferable that the wire assembly portion is a stranded wire portion at least in both the inner layer portion and the outer layer portion. In this way, the characteristics can be improved by increasing the number of stranded wires.

In the present invention, the cross-sectional shape of the winding core portion perpendicular to the winding center axis is preferably a circle, an ellipse, or a polygon with rounded corners. By selecting the cross-sectional shape of the winding core portion in this way, the winding shape of the wire assembly portion is less likely to collapse, and it becomes easy to maintain a good balance between the first wire and the second wire. In particular, the winding shape is easily broken in the stranded wire portion, and the selection of the cross-sectional shape of the winding core portion exerts a much greater effect than the case where the stranded wire portion is not provided.

According to the present invention, a high inductance value can be obtained and good mode conversion characteristics can be obtained without simply increasing the outer shape.

In particular, according to the first aspect of the present invention, in the outward transition portion and the inward transition portion, the first and second wires are not twisted, so that the following effects are obtained. That is, the outward transition portion is a portion where the outer layer portion is wound on the outer layer portion, and the inward transition portion is the outermost peripheral portion of the wire assembly portion, which influences the winding state of the wire assembly. Is. Therefore, by not making the portion a stranded wire portion in which the disorder of the wound state is likely to be large, it is possible to improve the wound state of the wire assembly portion and reduce the variation. Further, in the production process, the winding of the wire assembly portion can be stably performed.

Further, particularly according to the second aspect of the present invention, the following effects are exhibited. That is, the outward transition portion and the inward transition portion may partially inflate the winding body of the wire assembly portion at the portion where they exist. According to the second aspect of the present invention, the partial bulge of the winding body of the wire assembly portion is positioned so as to avoid a space-sensitive portion such as a portion of the winding core portion facing the plate-shaped core. Can be made to. As a result, even if the outer shape is the same, the winding core portion can be made thicker, whereby the electrical characteristics and the mechanical strength can be improved.

A common mode choke coil 51 as a coil component according to the first embodiment of the present invention is shown, (A) is a front view, and (B) is a bottom view showing a surface facing the mounting board side. It is sectional drawing which shows typically the winding state of the wire assembly part 44 which consists of the 1st and 2nd wire 41 and 42 in the common mode choke coil 51 shown in FIG. The frequency characteristics of the S parameter (Sds21) are shown in the common mode choke coil 51 (Example 1) shown in FIGS. 1 and 2 and the common mode choke coil 51 m (comparative example 1) shown in FIG. It is shown in comparison with the common mode choke coil 51n (Comparative Example 2). Regarding the common mode choke coil 51 (Example 1) shown in FIGS. 1 and 2 and the common mode choke coil 51n (Comparative Example 2) shown in FIG. 19, S21 and S31, which are constituent parameters of the mode conversion characteristics, are used. The frequency characteristics of S21-S31, which are differences, are shown separately for the real part and the imaginary part. (A) shows the real part and (B) shows the imaginary part. Regarding the common mode choke coil 51 (Example 1) shown in FIGS. 1 and 2 and the common mode choke coil 51n (Comparative Example 2) shown in FIG. 19, the frequency characteristics of the parasitic capacitance of the entire coil in the common mode are shown. It is a figure which shows. It is a figure corresponding to FIG. 2 which shows the 2nd Embodiment of this invention. The frequency characteristics of the S parameter (Sds21) are shown by comparison between the common mode choke coil 51 shown in FIG. 2 and the common mode choke coil 51a shown in FIG. It is a figure corresponding to FIG. 2 which shows the 3rd Embodiment of this invention. It is a figure corresponding to FIG. 2 which shows the 4th Embodiment of this invention. It is a figure corresponding to FIG. 2 which shows the 5th Embodiment of this invention. It is a figure corresponding to FIG. 2 which shows the sixth embodiment of this invention. It is a figure corresponding to FIG. 2 which shows the 7th Embodiment of this invention. It is a figure corresponding to FIG. 2 which shows the 8th embodiment of this invention. It is a figure corresponding to FIG. 2 which shows the 9th Embodiment of this invention. It is a figure corresponding to FIG. 2 which shows the tenth embodiment of this invention. It is a figure which shows a preferable example about the cross-sectional shape of the winding core portion 45. (A) shows the stranded wire 43z in which the first wire 41 and the second wire 42 are Z-twisted, and in (B), the first wire 41 and the second wire 42 are S-twisted. The stranded wire 43s is shown, and FIG. 3C is a diagram showing an illustrated mode of a wire assembly portion composed of two wires adopted in the present drawing. It is a figure corresponding to FIG. 2 for demonstrating the problem to be solved by this invention, and is the figure which shows the common mode choke coil 51m (comparative example 1) which includes the wire assembly part 44 of 16 turns in a single layer. is there. It is a figure corresponding to FIG. 2 for demonstrating the problem to be solved by this invention, and is the figure which shows the common mode choke coil 51n (comparative example 2) which includes the wire assembly part 44 of 2 layers and 31 turns. is there. The frequency characteristics of the S parameter (Sds21) are shown in comparison between the common mode choke coil 51m (Comparative Example 1) shown in FIG. 18 and the common mode choke coil 51n (Comparative Example 2) shown in FIG. It is a thing.

[First Embodiment]
The common mode choke coil 51 as a coil component according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. In addition, in FIGS. 1 and 2, the elements corresponding to the elements shown in FIGS. 17 to 19 described above are designated by the same reference numerals.

The common mode choke coil 51 includes a drum-shaped core 52 and first and second wires 41 and 42 that form inductors, respectively. In FIG. 1, only both ends of the first and second wires 41 and 42 are shown, and for the intermediate portion, as described above with reference to FIG. 17, the first wire 41 and the second wire 41 and the second The wire assembly portion 44 including the wire 42 is schematically shown in a single wire state. The drum-shaped core 52 is made of an electrically insulating material, more specifically, a non-magnetic material such as alumina, a magnetic material such as Ni—Zn-based ferrite, or a resin. The wires 41 and 42 are composed of, for example, an insulatingly coated copper wire.

The drum-shaped core 52 has first and second flanges 53 and 54 provided on the winding core 45 and the opposite first and second ends 46 and 47 of the winding core 45, respectively. The first and second wires 41 and 42 are the first on the first collar 53 side around the winding core 45, most of which are schematically illustrated as wire assembly portions 44. It is spirally wound between the end portion 46 and the second end portion 47 on the side of the second flange portion 54 while being parallel to each other in the same direction. It should be noted that the first and second wires 41 and 42 usually have substantially the same number of turns as each other.

The first flange portion 53 is provided with the first and second terminal electrodes 55 and 56, and the second flange portion 54 is provided with the third and fourth terminal electrodes 57 and 58. The terminal electrodes 55 to 58 are formed, for example, by baking a conductive paste, plating a conductive metal, attaching a conductive metal piece, or the like.

Each end of the first wire 41 is connected to the first and third terminal electrodes 55 and 57, respectively, and each end of the second wire 42 is connected to the second and fourth terminal electrodes 56, respectively. And 58 are connected. For example, thermocompression bonding or welding is applied to these connections.

The common mode choke coil 51 further includes a plate-shaped core 59. Like the drum-shaped core 52, the plate-shaped core 59 is made of, for example, a non-magnetic material such as alumina, a magnetic material such as Ni—Zn-based ferrite, or a resin. When the drum-shaped core 52 and the plate-shaped core 59 are made of a magnetic material, the drum-shaped core 52 is formed by providing the plate-shaped core 59 so as to connect between the first and second flange portions 53 and 54. A closed magnetic path is constructed in cooperation with the shape core 59.

FIG. 2 shows a schematic cross-sectional view of the wound state of the wire assembly portion 44 composed of the first and second wires 41 and 42 in the common mode choke coil 51 having the above configuration. Since FIGS. 1 and 2 are schematic views, the number of turns of the wire assembly portion 44 does not match that shown in FIG. 1 and FIG. 2, but the wire assembly portion 44 is The winding state of the above will be described mainly with reference to FIG.

The wire assembly portion 44 has a stranded portion in which the first and second wires 41 and 42 are twisted together.
(A) An inner layer portion N wound in a state of being in contact with the peripheral surface of the winding core portion 45 with the first end portion 46 side as the starting end, and
(B) The outer layer portion G wound around the outer peripheral side of the inner layer portion N,
(C) An outward transition portion S that is transitioned from the inner layer portion N to the outer layer portion G, and
(D) An inward transition portion T that is transitioned from the outer layer portion G to the inner layer portion N, and
Consists of.

The above-mentioned outer layer portion G is
Two wire assembly portions 44 composed of a wire assembly portion 44 that is pulled out by the outward transition portion S from the intermediate position in the winding central axis direction of the inner layer portion N and returned to the intermediate position of the inner layer portion N by the inward transition portion T. The first outer layer part Ga and
It is classified into a second outer layer portion Gb composed of a wire assembly portion 44 drawn by an outward transition portion S from the terminal position on the second end 47 side of the inner layer portion N.

Hereinafter, the winding mode of the wire assembly portion 44 will be described according to the number of turns of the wire assembly portion 44 on the winding core portion 45. First, turns 1 to 5 form the inner layer portion N, and then the turns. The portion that transitions from 5 to turn 6 constitutes the outward transition portion S, then turns 6-9 constitute the first first outer layer portion Ga, and then the transition from turn 9 to turn 10. The inward transition portion T is configured by the portion to be used.

Next, turns 10 to 15 constitute the inner layer portion N, then the portion transitioning from turn 15 to turn 16 constitutes the outward transition portion S, and then turns 16 to 21 form the second first. The outer layer portion Ga of the above is formed, and then the inward transition portion T is formed by the portion that transitions from turn 21 to turn 22.

Next, turns 22 to 26 constitute the inner layer portion N, then the portion transitioning from turn 26 to turn 27 constitutes the outward transition portion S, and then turns 27 to 31 form the second outer layer portion Gb. Is configured.

As shown in FIG. 1, one end of the wire assembly portion 44 described above is divided into a first wire 41 and a second wire 42, and is connected to the first and second terminal electrodes 55 and 56, respectively. Will be done. The other end of the wire assembly portion 44 is also divided into a first wire 41 and a second wire 42, which are connected to the third and fourth terminal electrodes 57 and 58, respectively.

In FIG. 1A, the outer layer portion G formed by the wire assembly portion 44 is partially broken and shown, and the inner layer portion N is visible at the broken portion. Then, it can be seen that the outward transition portion S described above also extends so as to cross some turns of the inner layer portion N. As a precaution, the broken portion is shown for the sake of explanation, and the actual common mode choke coil 51 does not have the broken portion.

The outward transition portion S and the inward transition portion T extend on the winding core portion 45 in a range of less than 0.5 turns.

This embodiment has the following features.

First, the wire assembly portion 44 constitutes the first outer layer portion Ga at a plurality of locations, specifically, two locations. This makes it possible to increase the number of turns of the wire assembly portion 44 while suppressing deterioration of the mode conversion characteristic, thereby making it possible to improve the inductance value.

Further, as the outer layer portion G, not only the first outer layer portion Ga but also the second outer layer portion Gb is provided. This also contributes to increasing the number of turns of the wire assembly portion while suppressing the deterioration of the mode conversion characteristic.

Further, in the outer layer portion G, the wire assembly portion 44 is wound from the first end portion 46 side toward the second end portion 47 side. Therefore, as compared with the case where the wire assembly portion 44 is wound from the second end portion 47 side toward the first end portion 46 side (see FIG. 12), the wire assembly portion constituting the outer layer portion G is formed. The difference in the number of turns between adjacent turns between the portion 44 and the wire assembly portion 44 constituting the inner layer portion N located inside the portion 44 can be made smaller.

Further, the outward transition portion S exists at three locations around the winding core portion 45. As the number of outward transition portions S increases, the difference in the number of turns in the portion where stray capacitance occurs between the inner layer portion N and the outer layer portion G can be reduced, and the common of the wire assembly portion 44 can be reduced. The combined parasitic capacitance for the mode signal can be reduced. Therefore, this makes it possible to improve the inductance value while suppressing the deterioration of the mode conversion characteristic.

Further, the number of turns of the wire assembly portion 44 on the winding core portion 45 is 31 which is 15 or more. A configuration in which the number of turns is 15 or more makes it possible to obtain an inductance value of 50 μH or more in the common mode choke coil 51 when the plane dimension is 4.5 mm × 3.2 mm.

Although not shown, the number of twists per turn of the first and second wires 41 and 42 is 0.5 or more and 8 or less, preferably 4 or more and 8 or less. .. By setting the number of twists to a predetermined number or more in this way, the effect of improving the mode conversion characteristics can be enhanced. Further, by setting the number of twists to a predetermined number or less, the reliability and manufacturing efficiency of the common mode choke coil 51 can be ensured.

Further, although not shown, in the outward transition portion S and the inward transition portion T, no twist is given to the first and second wires 41 and 42. The outward transition portion S is a portion around which the outer layer portion G is wound, the inward transition portion T is the outermost portion of the wire assembly portion 44, and both portions S and T are wires. It is a part that influences the winding state of the aggregate part 44. Therefore, by not making the portion a stranded wire portion in which the winding state is largely disturbed, the winding state of the wire assembly portion 44 can be made more uniform and the variation can be reduced. Further, in the production process, the winding of the wire assembly portion 44 can be stably performed.

Further, although not shown, the direction of the twist given to the wire assembly portion 44 in the middle of winding the wire assembly portion 44 is the Z twist shown in FIG. 17 (A) and the S twist shown in the same (B). You may switch between. Such switching of the twisting direction can be easily achieved by applying, for example, the method described in Japanese Patent No. 5239822.

Further, as can be seen from the position of the outward transition portion S shown in FIG. 1A, the outward transition portion S and the inward transition portion T are the portion of the winding core portion 45 facing the plate-shaped core 59 and the said portion. It is made to be absent in any of the parts on the opposite side of the part. The outward transition portion S and the inward transition portion T may partially inflate the winding body of the wire assembly portion 44 at the portion where they are present. According to the configuration as described above, the partial bulge of the winding body of the wire assembly portion 44 is made into a space such as a portion of the winding core portion 45 facing the plate-shaped core 59 and a portion opposite to the portion. It can be positioned avoiding parts that are susceptible to restrictions. As a result, even if the outer shape is the same, the winding core portion 45 can be made thicker, whereby the electrical characteristics and the mechanical strength can be improved.

In particular, if the outward transition portion S and the inward transition portion T are not present in the portion of the winding core portion 45 opposite to the plate-shaped core 59, the wire is compared with the case where it is present. Since the distance between the wires 41 and 42 and the mounting board can be increased, the stray capacitance generated between the wires 41 and 42 and the mounting board can be reduced, and the influence of noise input and radiation can be reduced.

The above characteristics also apply to other embodiments, unless otherwise noted.

The frequency characteristics of the S-parameters (Sds21) of the common mode choke coil 51 shown in FIGS. 1 and 2 are shown in FIG. In order to facilitate the evaluation of the mode conversion characteristics of the common mode choke coil 51, in FIG. 3, Sds21 of the common mode choke coil (Comparative Example 1) of FIG. 18 and the common mode choke coil of FIG. It is also shown together with Sds21 of Comparative Example 2). In FIG. 3, Sds21 of the common mode choke coil 51 (Example 1) is shown by a solid line, Sds21 of Comparative Example 1 is shown by a dotted line, and Sds21 of Comparative Example 2 is shown by a alternate long and short dash line.

As shown in FIG. 3, the mode conversion characteristic (Sds21) is best in Comparative Example 1, followed by Example 1 and Comparative Example 2, in that order.

As described above, in Comparative Example 1, since the wire assembly portion 44 is wound with a single layer, the line capacitance of the wire assembly portion 44 between the inner layer side and the outer layer side cannot occur. Therefore, the mode conversion characteristic is the best. On the other hand, in Example 1 and Comparative Example 2, the line capacitance of the wire assembly portion 44 between the inner layer side and the outer layer side is generated. Therefore, the mode conversion characteristics of Example 1 and Comparative Example 2 are inferior to those of Comparative Example 1.

Comparing Example 1 and Comparative Example 2, the difference in the number of turns between the wire assembly portion 44 on the inner layer side and the wire assembly portion 44 on the outer layer side is different from that of Comparative Example 2 in Example 1. Is smaller.

That is, in the first embodiment, for example, the turn 6 and the turn 7 of the wire assembly portion 44 on the outer layer side are adjacent to the turn 2 of the wire assembly portion 44 on the inner layer side. Further, the turn 16 and the turn 17 of the wire assembly portion 44 on the outer layer side are adjacent to the turn 10 of the wire assembly portion 44 on the inner layer side. Further, the turn 27 and the turn 28 of the wire assembly portion 44 on the outer layer side are adjacent to the turn 22 of the wire assembly portion 44 on the inner layer side. Therefore, the difference in the number of turns between the wire assembly portion 44 on the inner layer side and the wire assembly portion 44 on the outer layer side is 4 to 7.

On the other hand, in Comparative Example 2, the turn 17 and the turn 18 of the wire assembly portion 44 on the outer layer side are adjacent to the turn 2 of the wire assembly portion 44 on the inner layer side. Therefore, the difference in the number of turns between the wire assembly portion 44 on the inner layer side and the wire assembly portion 44 on the outer layer side is as large as 15 to 16.

Therefore, the line capacitance with respect to the common mode signal of the entire wire assembly portion 44 is smaller in Example 1 than in Comparative Example 2. It is presumed that the mode conversion characteristic was better in Example 1 than in Comparative Example 2 due to this difference in line capacitance.

The data on which the above estimation was based are shown below.

In FIG. 4, with respect to the first embodiment and the second comparative example, the frequency characteristics of S21-S31, which is the difference between S21 and S31, which are the constituent parameters of the mode conversion characteristics, are shown in (A) the real part and (B). It is shown separately from the imaginary part. In S21-S31 shown in FIG. 4, it can be evaluated that the closer to 0 in both the (A) real part and (B) imaginary part, the better the mode conversion characteristic. FIG. 5 shows the frequency characteristics of the parasitic capacitance of the entire coil in the common mode for Example 1 and Comparative Example 2.

Normally, it was not possible to imagine that there was any relationship between S21-S31 shown in FIG. 4 and the common mode capacitance shown in FIG. However, the inventors of the present invention refer to S21-S31 shown in FIG. 4 and the common mode capacitance shown in FIG. 5 for Comparative Example 2, and S21- in the frequency range where the common mode capacitance peaks. It was discovered that S31 was far from 0 and the mode conversion characteristics were deteriorated. On the other hand, in Example 1, a conspicuous peak did not appear in the common mode capacitance characteristic shown in FIG. 5, and S21-S31 shown in FIG. 4 was closer to 0 as compared with Comparative Example 2, and the mode conversion characteristic was closer. It turned out to be good.

As described above, the present inventors have found that there is a relationship between S21-S31 shown in FIG. 4 and the common mode capacitance shown in FIG.

Therefore, the inventors of the present invention are considering reducing (not increasing) the peak of the common mode capacitance, and in the common mode, the signals are in phase with each other on the two wires forming the wire assembly portion. Since it is propagated, two wires with the same turn ordinal number have the same potential, so no parasitic capacitance is generated. Therefore, even if the two wires are twisted together, they are common in a single wire. I came up with the idea that the same idea as capacity reduction in mode could be adopted.

That is, in Comparative Example 2, the wire assembly portion 44 is wound in two layers, but as described above, between the wire assembly portion 44 on the inner layer side and the wire assembly portion 44 on the outer layer side. There is a big difference in the number of turns. When the difference in the number of turns increases between adjacent turns, the relative influence of the line capacitance generated between these turns on the parasitic capacitance value of the entire common mode choke coil increases, and accordingly, it increases. Line capacitance is generated.

On the other hand, in the first embodiment, the first outer layer portion Ga is composed of the wire assembly portion 44 that is pulled out from the intermediate position of the inner layer portion N in the winding center axis direction and returned to the intermediate position. Therefore, the difference in the number of turns between adjacent turns between the wire assembly portion 44 constituting the first outer layer portion Ga and the wire assembly portion 44 forming the inner layer portion N located inside the first outer layer portion Ga is compared. It can be made smaller than the case of Example 2. Therefore, as shown in FIG. 5, the common mode capacitance in Example 1 can be made smaller than that in Comparative Example 2.

For reference, in Comparative Example 1 shown in FIG. 18, since the wire assembly portion 44 is wound with a single layer, the wire assembly portion 44 as described above exists on the inner layer side and the outer layer side. It does not take the configuration of doing. That is, only the line capacitance between consecutive turn ordinals (that is, series capacitance) is generated, and the line capacitance (parallel capacitance) with a large difference in the number of turn ordinals that greatly affects the total parasitic capacitance is not generated, and the total parasitic capacitance is small.

On the other hand, when comparing the number of turns of the wire assembly portion 44, the number of turns in Example 1 and Comparative Example 2 is 31, whereas that in Comparative Example 1 is as small as 16. Therefore, it can be easily estimated that the inductance values of Example 1 and Comparative Example 2 are higher than those of Comparative Example 1.

Comprehensively judging from the above points, it can be seen that only the first embodiment can achieve both good mode conversion characteristics and a high inductance value.

[Second Embodiment]
Next, the common mode choke coil 51a according to the second embodiment of the present invention will be described with reference to FIG. In FIG. 6 and FIGS. 8 to 15 described later, the elements corresponding to the elements shown in FIG. 2 are designated by the same reference numerals, and duplicate description will be omitted.

The common mode choke coil 51a has a larger number of turns in the wire assembly portion 44 than the common mode choke coil 51 described above. That is, the number of turns is 37. Further, in the common mode choke coil 51, three outward transition portions S exist around the winding core portion 45, but in the common mode choke coil 51a, there are five locations. Therefore, in the common mode choke coil 51a, five outer layer portions G, more specifically, four first outer layer portions Ga and one second outer layer portion Gb are formed.

Regarding the common mode choke coil 51a, the winding mode of the wire assembly portion 44 will be described according to the number of turns of the wire assembly portion 44 on the winding core portion 45. First, the inner layer portions N are formed by turns 1 to 4. Then, the outward transition portion S is formed by the portion that transitions from turn 4 to turn 5, then the first outer layer portion Ga is formed by turns 5 to 7, and then from turn 7 to turn 8. The inward transition portion T is configured by the transition portion.

Next, turns 8 to 11 constitute the inner layer portion N, then the portion transitioning from turn 11 to turn 12 constitutes the outward transition portion S, and then turns 12 to 15 constitute the first outer layer portion Ga. Is then configured, and then the inward transition portion T is configured by the portion that transitions from turn 15 to turn 16.

Next, turns 16 to 19 constitute the inner layer portion N, then the portion that transitions from turn 19 to turn 20 constitutes the outward transition portion S, and then turns 20 to 23 constitute the first outer layer portion Ga. Is then configured, and then the inward transition portion T is configured by the portion that transitions from turn 23 to turn 24.

Next, turns 24-27 constitute the inner layer portion N, then the portion transitioning from turn 27 to turn 28 constitutes the outward transition portion S, and then turns 28-31 constitute the first outer layer portion Ga. Is then configured, and then the inward transition portion T is configured by the portion that transitions from turn 31 to turn 32.

Next, turns 32 to 34 constitute the inner layer portion N, then the portion transitioning from turn 34 to turn 35 constitutes the outward transition portion S, and then turns 35 to 37 form the second outer layer portion Gb. Is configured.

The frequency characteristics of Sds21 of the common mode choke coil 51a are shown in FIG. In addition, in FIG. 7, in order to facilitate the evaluation of the mode conversion characteristic of the common mode choke coil 51a (Example 2), Sds21 of the common mode choke coil 51 (Example 1) also shown in FIG. 3 is also shown. Has been done. In FIG. 7, Sds21 of the common mode choke coil 51 (Example 1) is shown by a solid line, and Sds21 of the common mode choke coil 51a (Example 2) is shown by a dotted line.

As shown in FIG. 7, the mode conversion characteristic (Sds21) of Example 2 is improved from that of Example 1. In Example 2, the number of outward transition portions S is larger than in Example 1, and the number of turns in the portion where the line capacitance is generated between the inner layer portion N and the outer layer portion G is improved. It is presumed that this is because the difference could be reduced.

[Third Embodiment]
Next, the common mode choke coil 51b according to the third embodiment of the present invention will be described with reference to FIG.

Compared with the common mode choke coil 51 shown in FIG. 2, for example, the common mode choke coil 51b has the same number of turns of the wire assembly portion 44, but the number of outward transition portions S and inward transition portion T. There are many.

Regarding the common mode choke coil 51b, the winding mode of the wire assembly portion 44 will be described according to the number of turns of the wire assembly portion 44 on the winding core portion 45. First, the inner layer portion N is formed by turns 1 and 2. Then, the outward transition portion S is formed by the portion that transitions from turn 2 to turn 3, then the first outer layer portion Ga is formed by turn 3, and then the transition from turn 3 to turn 4 occurs. The portion constitutes an inward transition portion T.

Next, turns 4 to 5 constitute the inner layer portion N, then the portion transitioning from turn 5 to turn 6 constitutes the outward transition portion S, and then turns 6 to 7 constitute the first outer layer portion Ga. Is then configured, and then the inward transition portion T is configured by the portion that transitions from turn 7 to turn 8.

After that, the same winding state is repeated, and finally, the inner layer portion N is formed by turns 28 to 29, and then the outward transition portion S is formed by the portion transitioning from turn 29 to turn 30. , Turns 30-31 constitute the second outer layer portion Gb.

According to this third embodiment, the number of outward transition portions S is as large as 8 as compared with the first embodiment described above, and as a result, the line capacitance between the inner layer portion N and the outer layer portion G. It is possible to reduce the difference in the number of turns in the part where

[Fourth Embodiment]
Next, the common mode choke coil 51c according to the fourth embodiment of the present invention will be described with reference to FIG.

Compared to the common mode choke coil 51b shown in FIG. 8, for example, the common mode choke coil 51c has the same number of turns of the wire assembly portion 44, but the number of outward transition portions S and inward transition portion T. Is even more.

Regarding the common mode choke coil 51c, the winding mode of the wire assembly portion 44 will be described according to the number of turns of the wire assembly portion 44 on the winding core portion 45. First, the inner layer portion N is formed by turns 1 and 2. Then, the outward transition portion S is formed by the portion that transitions from turn 2 to turn 3, then the first outer layer portion Ga is formed by turn 3, and then the transition from turn 3 to turn 4 occurs. The portion constitutes an inward transition portion T.

Next, turn 4 constitutes the inner layer portion N, then the portion transitioning from turn 4 to turn 5 constitutes the outward transition portion S, and then turn 5 constitutes the first outer layer portion Ga. Next, the inward transition portion T is configured by the portion that transitions from turn 5 to turn 6.

After that, the same winding state is repeated, and finally, the inner layer portion N is formed by the turn 30, and then the outward transition portion S is formed by the portion transitioning from the turn 30 to the turn 31, and then the turn. The second outer layer portion Gb is formed by 31.

According to this fourth embodiment, the number of outward transition portions S is as large as 15 as compared with the third embodiment described above, and as a result, between the lines between the inner layer portion N and the outer layer portion G. The difference in the number of turns in the part where the capacity is generated can be further reduced.

[Fifth Embodiment]
Next, the common mode choke coil 51d according to the fifth embodiment of the present invention will be described with reference to FIG.

The common mode choke coil 51d has a smaller number of turns in the wire assembly portion 44 than, for example, the common mode choke coil 51 shown in FIG. 2, but has the same number of outward transition portions S and inward transition portions T. Is. In the common mode choke coil 51d, the inner layer portion N and the outer layer portion G are divided into three groups, and spaces are provided between adjacent groups.

Regarding the common mode choke coil 51d, the winding mode of the wire assembly portion 44 will be described according to the number of turns of the wire assembly portion 44 on the winding core portion 45. First, the inner layer portions N are formed by turns 1 to 5. Then, the outward transition portion S is formed by the portion transitioning from turn 5 to turn 6, then the first outer layer portion Ga is formed by turns 6 to 9, and then from turn 9 to turn 10. The inward transition portion T is configured by the transition portion. A space is provided between turn 9 and turn 10.

Next, turns 10 to 14 constitute the inner layer portion N, then the portion transitioning from turn 14 to turn 15 constitutes the outward transition portion S, and then turns 15 to 18 form the first outer layer portion Ga. Is then configured, and then the inward transition portion T is configured by the portion that transitions from turn 18 to turn 19. A space is provided between turn 18 and turn 19.

Next, turns 19 to 22 constitute the inner layer portion N, then the portion that transitions from turn 22 to turn 23 constitutes the outward transition portion S, and then turns 23 to 25 constitute the second outer layer portion Gb. Is configured.

This fifth embodiment contributes to the diversification of the embodiments of the present invention. Specifically, as in the fifth embodiment, the intermediate position of the inner layer portion N, which is the position pulled out by the outward transition portion S and the position returned by the inward transition portion T, has a spread rather than a point. It shows that it may be a range. That is, the two positions do not have to exactly coincide as points, and the range from the point to be drawn to the point to be returned, for example, the range from turn 5 to turn 10 of the fifth embodiment, turn 14 to turn 19 Each of the ranges up to may be an intermediate position.

[Sixth Embodiment]
Next, the common mode choke coil 51e according to the sixth embodiment of the present invention will be described with reference to FIG.

Compared with the common mode choke coil 51 shown in FIG. 2, for example, the common mode choke coil 51e does not have the second outer layer portion Gb, and the number of turns of the wire assembly portion 44 is reduced by that amount. In the common mode choke coil 51e, the winding mode of the wire assembly portion 44 is the same as that of the common mode choke coil 51 shown in FIG. 2 from turn 1 to turn 26. Then, turn 26 is the final turn.

This sixth embodiment contributes to the diversification of the embodiments of the present invention.

[7th Embodiment]
Next, the common mode choke coil 51f according to the seventh embodiment of the present invention will be described with reference to FIG.

The common mode choke coil 51f has the same number of turns of the wire assembly portion 44 as compared with the common mode choke coil 51 shown in FIG. 2, for example, but the winding direction of the outer layer portion G is opposite. That is, in the outer layer portion G, the wire assembly portion 44 is wound from the second end portion 47 side toward the first end portion 46 side.

Regarding the common mode choke coil 51f, the winding mode of the wire assembly portion 44 will be described according to the number of turns of the wire assembly portion 44 on the winding core portion 45. First, the inner layer portions N are formed by turns 1 to 5. Then, the outward transition portion S is formed by the portion transitioning from turn 5 to turn 6, then the first outer layer portion Ga is formed by turns 6 to 9, and then from turn 9 to turn 10. The inward transition portion T is configured by the transition portion. The above-mentioned turns 6 to 9 are wound from the second end 47 side toward the first end 46 side.

Next, turns 10 to 15 constitute the inner layer portion N, then the portion transitioning from turn 15 to turn 16 constitutes the outward transition portion S, and then turns 16 to 21 constitute the first outer layer portion Ga. Is then configured, and then the inward transition portion T is configured by the portion that transitions from turn 21 to turn 22. Again, the turns 16-21 described above are wound from the second end 47 side toward the first end 46 side.

Next, turns 22 to 26 constitute the inner layer portion N, then the portion transitioning from turn 26 to turn 27 constitutes the outward transition portion S, and then turns 27 to 31 form the second outer layer portion Gb. Is configured. Turns 27 to 31 are also wound from the second end 47 side toward the first end 46 side.

In the outer layer portion G of the common mode choke coil 51f, the wire assembly portion 44 is wound from the second end portion 47 side toward the first end portion 46 side. Therefore, as compared with the case where the wire assembly portion 44 is wound from the first end portion 46 side to the second end portion 47 side as in the common mode choke coil 51 of FIG. 2, the outer layer portion There is a place where the difference in the number of turns between adjacent turns between the wire assembly portion 44 constituting G and the wire assembly portion 44 forming the inner layer portion N located inside the wire assembly portion 44 becomes considerably large. I can't deny it. However, the difference in the ordinal numbers of the turns can be made smaller than that shown in FIG.

Further, the outward transition portion S can be shortened as compared with the common mode choke coil 51 of FIG. Unlike the inward transition portion T, the outward transition portion S is a portion around which the outer layer portion G is wound, and is a portion that easily affects the winding state of the outer layer portion G. Therefore, by shortening the portion, the variation in the winding state of the common mode choke coil 51f can be reduced, the variation in characteristics can be reduced, the size can be reduced, and the reliability and production efficiency can be improved.

[8th Embodiment]
Next, 51 g of the common mode choke coil according to the eighth embodiment of the present invention will be described with reference to FIG.

The common mode choke coil 51g is characterized by the position of turn 3 which is the starting end of the first outer layer portion G appearing on the first end portion 46 side. That is, the turn 3 is on the first end 46 side from the turn 1 which is the starting end of the first inner layer portion N appearing on the first end 46 side. Such a configuration can be realized, for example, by bringing the turn 3 into contact with the first flange portion 53.

Regarding the common mode choke coil 51g, the winding mode of the wire assembly portion 44 will be described according to the number of turns of the wire assembly portion 44 on the winding core portion 45. First, the inner layer portion N is formed by turns 1 and 2. Then, the outward transition portion S is formed by the portion that transitions from turn 2 to turn 3, then the first outer layer portion Ga is formed by turns 3 to 4, and then from turn 4 to turn 5. The inward transition portion T is configured by the transition portion.

Next, turns 5 to 6 constitute the inner layer portion N, then the portion transitioning from turn 6 to turn 7 constitutes the outward transition portion S, and then turns 7 to 8 constitute the first outer layer portion Ga. Is then configured, and then the inward transition portion T is configured by the portion that transitions from turn 8 to turn 9.

After that, the same winding state is repeated.

This eighth embodiment contributes to the diversification of the embodiments of the present invention.

[9th Embodiment]
Next, the common mode choke coil 51h according to the ninth embodiment of the present invention will be described with reference to FIG.

In the first to eighth embodiments described above, the wire assembly portion 44 constituting the outer layer portion G is fitted into the recess formed between the adjacent turns of the wire assembly portion 44 constituting the inner layer portion N. Was there. On the other hand, in the ninth embodiment, for each turn of the wire assembly portion 44 constituting the inner layer portion N, each turn of the wire assembly portion 44 constituting the outer layer portion G is the winding core portion 45. It is characterized by being aligned in the radial direction. Such an aligned state is difficult to realize with a wire in a single wire state, but can be realized relatively easily with a wire assembly portion 44. This is because the surface of the wire assembly portion 44 has irregularities that can be entangled with each other.

Regarding the common mode choke coil 51h, the winding mode of the wire assembly portion 44 will be described according to the number of turns of the wire assembly portion 44 on the winding core portion 45. First, the inner layer portion N is formed by the turn 1. The outward transition portion S is then configured by the portion transitioning from turn 1 to turn 2, then the first outer layer portion Ga is configured by turn 2, and then by the portion transitioning from turn 2 to turn 3. The inward transition portion T is configured.

Next, turn 3 constitutes the inner layer portion N, then the portion transitioning from turn 3 to turn 4 constitutes the outward transition portion S, and then turn 4 constitutes the first outer layer portion Ga. Next, the inward transition portion T is configured by the portion that transitions from turn 4 to turn 5.

After that, the same winding state is repeated.

This ninth embodiment contributes to the diversification of the embodiments of the present invention. In the case of the ninth embodiment, the difference in the number of turns in the portion where the line capacitance is generated can be made particularly small. Further, in the case of the ninth embodiment, the number of windings of the wire assembly portion 44 can be increased with respect to the length of the same winding core portion 45. As a result, in the ninth embodiment, good mode conversion characteristics can be obtained and a high inductance value can be obtained.

[10th Embodiment]
Next, the common mode choke coil 51i according to the tenth embodiment of the present invention will be described with reference to FIG.

The common mode choke coil 51i is characterized in that the wire assembly portion 44 is wound in three layers.

Regarding the common mode choke coil 51i, the winding mode of the wire assembly portion 44 will be described according to the number of turns of the wire assembly portion 44 on the winding core portion 45. First, the inner layer portion N is formed by turns 1 and 2. Then, the outward transition portion S is configured by the portion transitioning from turn 2 to turn 3, then the intermediate layer portion C is configured by turn 3, and then by the portion transitioning from turn 3 to turn 4. The inward transition portion T is configured.

Next, turns 4 to 5 constitute the inner layer portion N, then the portion transitioning from turn 5 to turn 6 constitutes the outward transition portion S, and then turns 6 to 7 constitute the intermediate layer portion C. Then, the outward transition portion S is configured by the portion that transitions from turn 7 to turn 8.

Next, the outer layer portion G is formed by turns 8 to 9, and then the same winding state is repeated.

This tenth embodiment contributes to the diversification of the embodiments of the present invention.

FIG. 16 shows a preferable example of the cross-sectional shape of the winding core portion 45 perpendicular to the winding center axis.

The cross-sectional shape of the winding core portion 45 is usually rectangular, but the cross-sectional shape is not particularly limited to this. However, the cross-sectional shape of the winding core portion 45 is a circular shape shown in FIG. 16 (A) or a shape close thereto, for example, an elliptical shape shown in FIG. 16 (B) or a corner shown in FIG. 16 (C) is rounded. When it is a polygon such as a chamfered rectangle, it has an advantage that the twisted state and the wound shape of the wire assembly portion 44 are less likely to collapse. In particular, the winding shape is liable to collapse in the stranded wire portion, and the selection of the cross-sectional shape of the winding core portion 45 as described above exerts a much greater effect than the case where the stranded wire portion is not provided.

In the common mode choke coil 51 shown in FIG. 1, the first flange portion 53 is provided with the first and second terminal electrodes 55 and 56, and the second collar portion 54 is provided with the third and fourth terminals. Although the electrodes 57 and 58 are provided, all terminal electrodes may be provided on one of the collars.

Although the present invention has been described above in relation to the illustrated embodiment of the common mode choke coil, the present invention can also be applied to a balun, a transformer, or the like. It should also be noted that each of the illustrated embodiments is exemplary and that partial replacement or combination of configurations is possible between different embodiments.

Further, the wire assembly portion 44 may have at least a stranded wire portion in which the first and second wires 41 and 42 are twisted to each other, as compared with the case where the wire assembly portion 44 does not have the stranded wire portion at all. However, the deterioration of the characteristics due to the imbalance of the line capacitance can be reduced. In order to reduce the deterioration of characteristics, it is preferable that the stranded wire portion occupies a large portion. In particular, the portion excluding the outward transition portion S and the inward transition portion T, that is, the inner layer portion N and the outer layer portion G is preferably a stranded wire portion, and at this time, the wound state and the characteristics can be balanced. it can.

However, only one of the inner layer portion N or the outer layer portion G may be used as the stranded wire portion, and particularly when only the outer layer portion G is used as the stranded wire portion, the inner layer portion in which the wire assembly portion 44 is wound around itself. N can be a non-twisted wire portion with less disturbance in the wound state, and the wound state can be improved.

Further, in the above embodiment, almost all of the first and second wires 41 and 42 wound around the winding core portion 45 are the wire assembly portion 44, but the present invention is not limited to this, and the wire assembly portion is not limited to this. 44 may be a part of a portion wound around the core portion 45. That is, there may be a portion around the winding core portion 45 where the first and second wires 41 and 42 are wound in different directions or wound separately.

Further, in the above embodiment, the first and second wires 41 and 42 have substantially the same number of turns, but the number of turns may be different.

41 First wire 42 Second wire 43z, 43s Twisted wire 44 Wire assembly part 45 Winding core part 46 First end part 47 Second end part 51, 51a to 51i Common mode choke coil 52 Drum-shaped core 53 , 54 Brim part 55-58 Terminal electrode 59 Plate-shaped core N Inner layer part G Outer layer part Ga First outer layer part Gb Second outer layer part S Outer transition part T Inward transition part

Claims (9)

A drum-shaped core having a winding core portion and first and second flange portions provided at the opposite first and second end portions of the winding core portion, respectively.
With the first and second wires wound around the core and not electrically connected to each other,
With
The first and second wires have wire assembly portions that are wound together in the same direction around the core portion.
The wire assembly portion has a stranded wire portion in which the first and second wires are twisted together.
The inner layer portion wound in contact with the peripheral surface of the winding core portion and the inner layer portion
The outer layer portion wound around the outer peripheral side of the inner layer portion and
An outward transition portion that is transitioned from the inner layer portion to the outer layer portion,
An inward transition portion that is transitioned from the outer layer portion to the inner layer portion,
Consists of
In the outward transition portion and the inward transition portion, the first and second wires are not twisted.
The outer layer portion is pulled out by the outward transition portion from an intermediate position in the winding central axis direction of the inner layer portion and returned to the intermediate position of the inner layer portion by the inward transition portion by the wire assembly portion. Including the constructed first outer layer portion,
Coil parts. A drum-shaped core having a winding core portion and first and second flange portions provided at the opposite first and second end portions of the winding core portion, respectively.
With the first and second wires wound around the core and not electrically connected to each other,
With
The first and second wires have wire assembly portions that are wound together in the same direction around the core portion.
The wire assembly portion has a stranded wire portion in which the first and second wires are twisted together.
The inner layer portion wound in contact with the peripheral surface of the winding core portion and the inner layer portion
The outer layer portion wound around the outer peripheral side of the inner layer portion and
An outward transition portion that is transitioned from the inner layer portion to the outer layer portion,
An inward transition portion that is transitioned from the outer layer portion to the inner layer portion,
Consists of
The outer layer portion is pulled out by the outward transition portion from an intermediate position in the winding central axis direction of the inner layer portion and returned to the intermediate position of the inner layer portion by the inward transition portion by the wire assembly portion. Including the first outer layer portion constructed
The first and second flanges have at least one surface along the winding central axis, and the coil component is a coil component.
A first and second terminal electrode provided on at least one surface of the first flange portion and to which one end of the first wire and one end of the second wire are connected, respectively.
A third and fourth terminal electrode provided on at least one surface of the second flange portion and to which the other end of the first wire and the other end of the second wire are connected, respectively.
A plate-shaped core passed between the first and second collar portions in a state of being in contact with the side opposite to the one surface of the first and second flange portions.
With more
The outward transition portion and the inward transition portion are made not to exist in the portion of the winding core portion facing the plate-shaped core.
Coil parts. The coil component according to claim 2, wherein the outward transition portion and the inward transition portion do not exist on the opposite side of the portion facing the plate-shaped core. The coil component according to any one of claims 1 to 3, wherein the wire assembly portion around the winding core portion constitutes the first outer layer portion at a plurality of locations. Claims 1 to 4 further include a second outer layer portion formed by the wire assembly portion pulled out from the position on the second end side of the inner layer portion by the outward transition portion. The coil component described in any of. The coil component according to any one of claims 1 to 5, wherein the outward transition portion exists at two or more locations and five or less locations around the winding core portion. The coil component according to any one of claims 1 to 6, wherein the number of turns of the wire assembly around the winding core portion is 15 or more. The coil component according to any one of claims 1 to 7, wherein the wire assembly portion is a stranded wire portion at least in both the inner layer portion and the outer layer portion. The coil component according to any one of claims 1 to 8, wherein the cross-sectional shape of the winding core portion perpendicular to the winding center axis is a circular shape, an elliptical shape, or a polygonal shape with rounded corners.

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