Coil components

Abstract

The present invention provides a coil component. In a common mode choke coil as an example of a coil component, good mode conversion characteristics can be obtained even if the number of turns of the wire is increased to obtain a high inductance value. A wire assembly portion (44) composed of two wires twisted together is wound around a winding core portion (45). The wire assembly portion is composed of an inner layer portion (N) that is wound in contact with the peripheral surface of the winding core portion starting from the first end portion (46) side of the winding core portion; an outer layer portion (G) that is wound on the outer peripheral side of the inner layer portion; an outward transition portion that transitions from the inner layer portion to the outer layer portion; and an inward transition portion that transitions from the outer layer portion to the inner layer portion. The wire assembly portion is drawn out from the middle position in the winding center axis direction of the inner layer portion by means of the outward transition portion to form the outer layer portion, and then returns to the above-mentioned middle position of the inner layer portion by means of the inward transition portion.

Description

[0001] This invention patent application is a divisional application filed for the parent application, which is Chinese patent application number 201710068901.8, application date February 8, 2017, applicant Murata Manufacturing Co., Ltd., and invention name “Coil Component”, divisional application 202010621857.0. Technical Field

[0002] The present invention relates to a coil component, and more particularly to a coil component having a structure in which two wires twisted together are wound around a winding core. Background Art

[0003] A typical example of the coil component to which the present invention is applied is a common mode choke coil.

[0004] For example, Japanese Patent Application Laid-Open No. 2014-207368 (Patent Document 1) and Japanese Patent No. 5558609 (Patent Document 2) describe common mode choke coils in which a wire assembly in which two wires are twisted is partially wound around a winding core.

[0005] Patent Document 1: Japanese Patent Application Publication No. 2014-207368

[0006] Patent Document 2: Japanese Patent No. 5558609

[0007] The inventors of the present application have studied, as a future technology, to improve the mode conversion characteristics by using a structure formed by winding a wire assembly portion in a twisted wire state, and to achieve a high inductance value that has not existed before within certain shape restrictions.

[0008] First, in simple terms, in order to achieve a high inductance value, it is effective to increase the number of turns of the wire aggregate portion.

[0009] However, when winding the wire aggregate portion in a twisted state, it is impossible to arrange the wire aggregate portion neatly and without gaps on the winding core due to the shape of the twisted wire itself, that is, the concave-convex outer peripheral surface formed by the two twisted wires. In other words, if the wire aggregate portion is wound around the winding core, it is easy to produce useless space. Therefore, when winding the wire aggregate portion around the winding core having a predetermined size, the number of turns has to be less than the case of winding the wires in a single-wire state. As a result, it is difficult to expect a high inductance value.

[0010] Therefore, in order to increase the number of turns of the wire aggregate portion, it is considered to adopt a structure in which the wire aggregate portion in a twisted wire state is wound in two or more layers. Figure 18 to Figure 20 This is explained.

[0011] also, Fig.17 is a diagram for explaining the illustrated form of a wire assembly portion composed of two wires used in the drawings of the present application, wherein Fig.17 In (A), an enlarged front view is shown in which the first and second wires 41 and 42 are twisted into a strand 43z. Fig.17 In (B), an enlarged front view is shown of the stranded wire 43s formed by S-twisting the first and second wires 41 and 42. In the drawings of the present application, whether it is the stranded wire 43z or the stranded wire 43s, or when no twisting is performed, all are in accordance with Fig.17 The single-wire state shown in (C) schematically illustrates the wire aggregate portion 44 composed of the first and second wires 41 and 42 .

[0012] exist Fig.18 and Fig.19 In the figure, a wire aggregate portion 44 composed of the first and second wires 41 and 42 wound around the winding core 45 is schematically illustrated in a cross-sectional view. The number marked in the cross section of the wire aggregate portion 44 is a number indicating the number of turns of the wire aggregate portion 44 wound around the winding core 45, that is, the turn number. In addition, the mark of the turn number in each cross section of the wire aggregate portion 44 is also used in the same drawings described later.

[0013] exist Fig.18 In the common mode choke coil 51m shown, the wire assembly portion 44 is wound from the first end 46 of the winding core 45 toward the second end 47 in a single layer from the first turn (hereinafter referred to as "turn 1") to the turn 16 while being in contact with the peripheral surface of the winding core 45. Fig.19 In the common mode choke coil 51n shown, the wire assembly portion 44 is wound from turn 1 to turn 16 from the first end 46 of the core portion 45 toward the second end 47 while in contact with the circumferential surface of the core portion 45, and then returns to the vicinity of the first end 46 of the core portion 45 and is wound from turn 17 to turn 31, so that an outer layer portion is formed on the outer peripheral side of the inner layer portion formed by turns 1 to 16.

[0014] Here, the inventor of the present application found that: Fig.18 The common mode choke coil 51m shown in FIG. Fig.19 In the common mode choke coil 51n shown, Sds21 which is a mode conversion characteristic is deteriorated.

[0015] For the sake of Fig.18 The common mode choke coil 51m (Comparative Example 1) shown in FIG. 1 includes a wire assembly portion 44 having 16 turns in a single layer. Fig.19 The mode conversion characteristics of the common mode choke coil 51n (Comparative Example 2) having 31 turns of the wire assembly part 44 in a double layer were evaluated. Fig. 20 The S parameters are shown in Fig. 20 The relationship for obtaining the frequency characteristics of Sds21 is shown in FIG.

[0016] from Fig. 20 It can be seen that in Comparative Example 2 shown by the solid line, a higher level of Sds21 value is presented compared to Comparative Example 1 shown by the dotted line, and the mode conversion characteristics are greatly deteriorated. That is, from Comparative Example 2, it is easy to infer that: although the number of turns of the wire aggregate part 44 is large, a higher inductance value can be obtained, it is known that the mode conversion characteristics are greatly deteriorated compared to Comparative Example 1.

[0017] The same problem is not limited to common mode choke coils, but may also be encountered in coil components such as a balun or transformer having two wires, wherein the two wires have a wire assembly portion wound together in the same direction around a winding core. Summary of the invention

[0018] Therefore, an object of the present invention is to provide a coil component that can obtain good mode conversion characteristics even if the number of turns of a wire is increased to obtain a high inductance value without simply increasing the outer shape.

[0019] The present invention is directed to a coil component, which comprises: a drum-shaped core having a winding core portion and first and second flange portions respectively provided at first and second ends of the winding core portion which are opposite to each other; first and second wires which are wound around the winding core portion and are not electrically connected to each other. The first and second wires have a wire assembly portion which is wound together in the same direction around the winding core portion.

[0020] In order to solve the above-mentioned technical problems, the present invention is characterized in that a wire material is wound as follows in such a coil component.

[0021] That is, the wire aggregate portion is characterized in that the wire aggregate portion has a twisted wire portion in which the first and second wires are twisted together, and the structure is as follows:

[0022] (A) an inner layer portion, which is wound in a state of being in contact with the peripheral surface of the winding core portion;

[0023] (B) an outer layer portion, which is wound around the outer periphery of the inner layer portion;

[0024] (C) an outward transition portion that transitions from the inner layer portion to the outer layer portion; and

[0025] (D) an inward transition portion, which transitions from the outer layer portion to the inner layer portion,

[0026] The outer layer portion includes a first outer layer portion, which is composed of a wire aggregate portion that is led out from the middle position of the inner layer portion in the winding center axis direction via the outward transition portion and returns to the middle position of the inner layer portion via the inward transition portion.

[0027] The first outer layer portion helps to increase the number of turns of the first and second wires as a whole without simply increasing the outer shape. In addition, the first outer layer portion is composed of a wire aggregate portion that is drawn out from the middle position in the winding center axis direction of the inner layer portion and returns to the middle position, so it is similar to Fig.19 Compared with the case of Comparative Example 2 shown in FIG. 1 , the difference in the number of turns between the wire aggregate portion constituting the first outer layer portion and the wire aggregate portion constituting the inner layer portion located inside the first outer layer portion can be reduced. Fig.19 Compared with the case of Comparative Example 2 shown in FIG. 1 , the combined capacitance value of the inter-line capacitance with respect to the common mode signal generated by the first wire and the second wire can be reduced.

[0028] Furthermore, in the present application, "the periphery of the winding core" includes not only the portion directly above the peripheral surface of the winding core, but also the portion above the winding core separated by components such as wires. In addition, "the middle position of the inner layer portion in the direction of the winding center axis" refers to any position other than the starting and ending points of the inner layer portion, and does not necessarily refer to the central part of the inner layer portion. Furthermore, the middle position may not be a point, but a range with a width. For example, for the first outer layer portion, the middle position of the lead-out and the middle position of the return do not need to be strictly consistent as points, and the range from the lead-out point to the return point may be the middle position.

[0029] In the present invention, the wire aggregate portion around the winding core preferably constitutes the first outer layer portion at a plurality of locations. This can suppress the deterioration of the mode conversion characteristics and increase the number of turns of the wire aggregate portion, thereby achieving an improvement in inductance value.

[0030] In addition, it is also preferred that the outer layer portion further includes a second outer layer portion, which is composed of a wire aggregate portion led out from the inner layer portion near the second end side by means of an outward transition portion. Through this second outer layer portion, it is possible to suppress the deterioration of the mode conversion characteristics and increase the number of turns of the wire aggregate portion, thereby achieving an increase in the inductance value. In addition, in the above case, there may also be a wire aggregate portion wound just above the winding core portion on the second end side of the second outer layer portion.

[0031] In the present invention, in the outer layer part, the wire aggregate part can be wound from the first end side toward the second end side, or vice versa, from the second end side toward the first end side. In the former case, in particular, compared with the latter case, the difference in the number of turns between the adjacent turns between the wire aggregate part constituting the outer layer part and the wire aggregate part constituting the inner layer part located inside it can be further reduced. On the other hand, in the latter case, compared with the former case, the outward transition part can be shortened, and the reduction of characteristic deviation, miniaturization, reliability and improvement of manufacturing efficiency can be achieved.

[0032] In the present invention, preferably there are 2 or more and 5 or less outward transition portions around the winding core. The more outward transition portions there are, the smaller the difference in the number of turns of the portion generating inter-wire capacitance between the inner layer portion and the outer layer portion can be.

[0033] In the present invention, the number of turns of the wire aggregate portion wound around the winding core is preferably not less than 15. For example, in this case, an inductance value of 50 μH or more can be obtained in a common mode choke coil having a plane size of 4.5 mm×3.2 mm.

[0034] In the present invention, the number of twists per turn in the stranded wire portion of the first and second wires is preferably 0.5 or more and 8 or less. Thus, by making the number of twists greater than a certain value, the effect of improving the mode conversion characteristics can be enhanced. In addition, by making the number of twists less than a certain value, the reliability and manufacturing efficiency of the coil component can be ensured.

[0035] It is preferable that the wire aggregate portion is a stranded wire portion at least in the inner layer portion and the outer layer portion. In this way, the stranded wire portion is increased, thereby improving the characteristics.

[0036] On the other hand, it is preferred that the first and second wires are not twisted in the outward transition portion and the inward transition portion. The outward transition portion is the portion on which the outer peripheral portion is wound, and the inward transition portion is the portion that becomes the outermost portion of the wire aggregate portion, and is the portion of the wound state of the left and right wire aggregates. Therefore, by preventing this portion from becoming a stranded wire portion where the degree of disorder in the winding state tends to increase, the winding state of the wire aggregate portion can be made more orderly, thereby reducing deviations. In addition, in the production process, the winding of the wire aggregate portion can be stably performed.

[0037] In the coil component involved in the present invention, it is preferred that the first and second flange parts have at least one side along the above-mentioned winding center axis, and the coil component also includes: first and second terminal electrodes, which are provided on at least one of the above-mentioned sides of the first flange part, and are used to connect one end of the first wire and one end of the second wire respectively; third and fourth terminal electrodes, which are provided on at least one of the above-mentioned sides of the second flange part, and are used to connect the other end of the first wire and the other end of the second wire respectively; and a plate-shaped core, which is provided between the first and second flange parts in a state of being in contact with the opposite side of the above-mentioned sides of the first and second flange parts. In this case, it is preferred that at least one or both of the part of the winding core part that is opposite to the plate-shaped core and the part on the opposite side of the part do not have an outward transition part and an inward transition part.

[0038] The outward transition portion and the inward transition portion have the possibility of causing the winding body of the wire aggregate portion to expand locally and significantly in the portion where they exist. According to the above structure, the local expansion of the winding body of the wire aggregate portion can be positioned to avoid the portion of the winding core portion that is opposed to the plate-shaped core and the portion on the opposite side of the portion that is easily restricted in space. As a result, even with the same outer shape, the winding core portion can be made thicker, thereby achieving improved electrical characteristics and improved mechanical strength. In addition, if the local expansion of the winding body of the wire aggregate portion is not present in the portion on the opposite side of the portion of the winding core portion that is opposed to the plate-shaped core, the distance between the wire and the mounting substrate can be increased compared to the case where it exists, thereby reducing the stray capacitance generated between the wire and the mounting substrate and reducing the influence of noise radiation.

[0039] In the present invention, the cross-sectional shape of the winding core part 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 part in this way, the winding shape of the wire aggregate part is less likely to collapse, and it is easy to ensure a good balance between the first wire and the second wire. In particular, in the stranded wire part, the winding shape is easy to collapse, and the selection of the cross-sectional shape of the winding core part exerts a much greater effect than the case where there is no stranded wire part.

[0040] According to the present invention, a high inductance value and good mode conversion characteristics can be obtained without simply increasing the size. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 The drawings show a common mode choke coil 51 as a coil component according to a first embodiment of the present invention, wherein (A) is a front view and (B) is a bottom view showing a surface facing a mounting substrate.

[0042] Figure 2 It is schematically shown Figure 11 is a cross-sectional view of a wound state of a wire aggregate portion 44 composed of first and second wires 41 and 42 in a common mode choke coil 51 shown.

[0043] Figure 3 It means in Figure 1 and Figure 2 The common mode choke coil 51 (Example 1) shown in FIG. Fig.18 The common mode choke coil 51m (Comparative Example 1) and Fig.19 FIG. 2 is a graph comparing the frequency characteristics of the S parameter (Sds21) between the common mode choke coils 51n (Comparative Example 2) shown.

[0044] Figure 4 It means for Figure 1 and Figure 2 The common mode choke coil 51 (Example 1) shown in FIG. Fig.19 The common mode choke coil 51n (comparison example 2) shown in the figure divides the frequency characteristic of the difference (S21-S31) between S21 and S31, which is a constituent parameter of the mode conversion characteristic, into a real part and an imaginary part, wherein (A) represents the real part and (B) represents the imaginary part.

[0045] Figure 5 It means for Figure 1 and Figure 2 The common mode choke coil 51 (Example 1) shown in FIG. Fig.19 The common mode choke coil 51n (Comparative Example 2) shown is a graph showing the frequency characteristics of the stray capacitance of the entire coil when the common mode is selected.

[0046] Figure 6 This is a second embodiment of the present invention and Figure 2 The corresponding figure.

[0047] Figure 7 is Figure 2 The common mode choke coil 51 shown in FIG. Figure 6 The common mode choke coils 51a shown are compared with each other and are graphs showing the frequency characteristics of the S parameter (Sds21).

[0048] Figure 8 This is a third embodiment of the present invention and Figure 2 The corresponding figure.

[0049] Fig. 9 This is a fourth embodiment of the present invention and Figure 2 The corresponding figure.

[0050] Fig.10 The fifth embodiment of the present invention is shown in FIG. Figure 2 The corresponding figure.

[0051] Fig.11This is a sixth embodiment of the present invention and Figure 2 The corresponding figure.

[0052] Fig.12 The seventh embodiment of the present invention is shown in FIG. Figure 2 The corresponding figure.

[0053] Fig.13 The eighth embodiment of the present invention is shown in FIG. Figure 2 The corresponding figure.

[0054] Fig.14 The ninth embodiment of the present invention is shown in FIG. Figure 2 The corresponding figure.

[0055] Fig.15 The tenth embodiment of the present invention is shown in FIG. Figure 2 The corresponding figure.

[0056] Fig.16 It is a diagram showing a preferred example of the cross-sectional shape of the winding core portion 45 .

[0057] Fig.17 (A) represents a stranded wire 43z formed by Z-twisting the first and second wires 41 and 42. Fig.17 (B) represents a stranded wire 43s formed by S-twisting the first and second wires 41 and 42. Fig.17 (C) is a diagram showing a schematic form of a wire aggregate portion consisting of two wires used in the drawings of the present application.

[0058] Fig.18 It is used to explain the problem to be solved by the present invention and Figure 2 The corresponding figure shows a common mode choke coil 51m (Comparative Example 1) including 16 turns of the wire assembly portion 44 in a single layer.

[0059] Fig.19 It is used to explain the problem to be solved by the present invention and Figure 2 The corresponding figure shows a common mode choke coil 51n (Comparative Example 2) including 31 turns of the wire assembly portion 44 in two layers.

[0060] Fig. 20 It means in Fig.18 The common mode choke coil 51m (Comparative Example 1) shown in FIG. Fig.19 FIG. 2 is a graph comparing the frequency characteristics of the S parameter (Sds21) between the common mode choke coils 51n (Comparative Example 2) shown.

[0061] Description of reference numerals:

[0062] 41...first wire; 42...second wire; 43z, 43s...stranded wire; 44...wire assembly portion; 45...winding core portion; 46...first end portion; 47...second end portion; 51, 51a~51i...common mode choke coil; 52...drum core; 53, 54...flange portion; 55~58...terminal electrodes; 59...plate core; N...inner layer portion; G...outer layer portion; Ga...first outer layer portion; Gb...second outer layer portion; S...outward transition portion; T...inward transition portion. DETAILED DESCRIPTION

[0063] First embodiment

[0064] Reference Figure 1 and Figure 2 A common mode choke coil 51 as a coil component according to a first embodiment of the present invention will be described. Figure 1 and Figure 2 In the above Figure 17 to Figure 19 Elements shown to be equivalent are denoted by the same reference numerals.

[0065] The common mode choke coil 51 includes a drum-shaped core 52 and first and second wires 41 and 42 that respectively constitute inductances. Figure 1 In the figure, only the two ends of the first and second wires 41 and 42 are shown, and the middle part is schematically shown in a single-line state. Fig.17 The wire aggregate part 44 is composed of the first wire 41 and the second wire 42 as described above. The drum core 52 is composed of an electrically insulating material, more specifically, a non-magnetic body such as aluminum, a magnetic body such as Ni-Zn ferrite, or a resin, etc. The wires 41 and 42 are composed of, for example, copper wires covered with an insulation coating.

[0066] The drum core 52 has a winding core 45 and first and second flanges 53 and 54 provided at first and second ends 46 and 47 opposite to each other of the winding core 45. As shown schematically in the figure, most of the first and second wires 41 and 42 are wound together in parallel and spirally in the same direction around the winding core 45 between the first end 46 on the first flange 53 side and the second end 47 on the second flange 54 side. In addition, the first and second wires 41 and 42 usually have substantially the same number of turns.

[0067] First and second terminal electrodes 55 and 56 are provided on first flange portion 53, and third and fourth terminal electrodes 57 and 58 are provided on second flange portion 54. Terminal electrodes 55 to 58 are formed by, for example, baking conductive paste, plating conductive metal, or attaching conductive metal sheets.

[0068] The ends of the first wire 41 are connected to the first and third terminal electrodes 55 and 57, respectively, and the ends of the second wire 42 are connected to the second and fourth terminal electrodes 56 and 58, respectively. For example, heat pressing or welding is used for the above connection.

[0069] The common mode choke coil 51 further includes a plate-shaped core 59. The plate-shaped core 59 is similar to the drum-shaped core 52 and is made of, for example, a non-magnetic material such as aluminum, a magnetic material such as Ni-Zn ferrite, or a resin. When the drum-shaped core 52 and the plate-shaped core 59 are made of a magnetic material, the plate-shaped core 59 is provided to connect the first and second flange portions 53 and 54, so that the drum-shaped core 52 and the plate-shaped core 59 cooperate to form a closed magnetic circuit.

[0070] exist Figure 2 , a schematic cross-sectional view is used to show the winding state of the wire assembly part 44 composed of the first and second wires 41 and 42 in the common mode choke coil 51 having the above structure. In addition, Figure 1 and Figure 2 For the schematic diagram, the number of turns of the wire assembly portion 44 is Figure 1 The situation shown is similar to Figure 2 The situations shown are not consistent, but mainly refer to Figure 2 The winding state of the wire aggregate portion 44 will be described.

[0071] The wire aggregate portion 44 includes a stranded wire portion in which the first and second wires 41 and 42 are twisted together, and the structure is as follows:

[0072] (A) The inner layer portion N is wound with the first end portion 46 as the starting end while being in contact with the peripheral surface of the winding core portion 45;

[0073] (B) an outer layer portion G, which is wound around the outer periphery of the inner layer portion N;

[0074] (C) an outward transition portion S, which transitions from the inner layer portion N to the outer layer portion G; and

[0075] (D) An inward transition portion T, which transitions from the outer layer portion G to the inner layer portion N.

[0076] The outer layer G mentioned above is classified into:

[0077] Two first outer layer portions Ga, which are composed of a wire aggregate portion 44 that is led out from a middle position in the winding center axis direction of the inner layer portion N by means of an outward transition portion S and returns to the above-mentioned middle position of the inner layer portion N by means of an inward transition portion T; and

[0078] The second outer layer portion Gb is composed of a wire aggregate portion 44 drawn out from a terminal position of the inner layer portion N on the second end portion 47 side via an outward transition portion S.

[0079] Below, the winding shape of the wire aggregate portion 44 is explained according to the turn number of the wire aggregate portion 44 on the winding core portion 45. First, the inner layer portion N is composed of turns 1 to 5, then the portion transitioning from turn 5 to turn 6 constitutes the outward transition portion S, then, the first outer layer portion Ga is composed of turns 6 to 9, and then, the portion transitioning from turn 9 to turn 10 constitutes the inward transition portion T.

[0080] Next, the inner layer part N is formed by turns 10 to 15, and then the outward transition part S is formed by the part transitioning from turn 15 to turn 16. Next, the second first outer layer part Ga is formed by turns 16 to 21, and then the inward transition part T is formed by the part transitioning from turn 21 to turn 22.

[0081] Next, the inner layer portion N is formed by turns 22 to 26, and then the outer transition portion S is formed by the portion transitioning from turn 26 to turn 27, and then the second outer layer portion Gb is formed by turns 27 to 31.

[0082] like Figure 1 As shown, one end of the wire assembly 44 is divided into the first wire 41 and the second wire 42, which are respectively connected to the first and second terminal electrodes 55 and 56. The other end of the wire assembly 44 is also divided into the first wire 41 and the second wire 42, which are respectively connected to the third and fourth terminal electrodes 57 and 58.

[0083] exist Figure 1 In (A), the outer layer portion G constituted by the wire aggregate portion 44 is partially shown in cross section, and the inner layer portion N can be observed at the cut position. In addition, the state where the outward transition portion S extends and crosses several turns of the inner layer portion N can be observed. In addition, for the sake of caution, it is explained as follows: the cut position is shown in the figure for explanation, and the cut position does not exist in the actual common mode choke coil 51.

[0084] The outward transition portion S and the inward transition portion T extend over the winding core 45 over a range of less than 0.5 turns.

[0085] This embodiment has the following features.

[0086] First, the wire aggregate portion 44 forms the first outer layer portion Ga at multiple locations, specifically at two locations. This can increase the number of turns of the wire aggregate portion 44 while suppressing deterioration of the mode conversion characteristics, thereby improving the inductance value.

[0087] In addition, the outer layer portion G includes not only the first outer layer portion Ga but also the second outer layer portion Gb. This also contributes to increasing the number of turns of the wire aggregate portion while suppressing the deterioration of the mode conversion characteristics.

[0088] In addition, in the outer layer portion G, the wire aggregate portion 44 is wound from the first end portion 46 side toward the second end portion 47 side. Therefore, compared with the case where the wire aggregate portion 44 is wound from the second end portion 47 side toward the first end portion 46 side (refer to Fig.12 ), the difference in the number of turns between adjacent turns between the wire aggregate portion 44 constituting the outer layer portion G and the wire aggregate portion 44 constituting the inner layer portion N located inside the outer layer portion G can be more reduced.

[0089] In addition, there are three outward transition portions S around the winding core 45. The greater the number of outward transition portions S, the smaller the difference in the number of turns of the portion generating the inter-wire capacitance between the inner layer portion N and the outer layer portion G can be, and the smaller the synthetic parasitic capacitance with respect to the common mode signal possessed by the wire aggregate portion 44 can be. Therefore, it is possible to suppress the deterioration of the mode conversion characteristics and improve the inductance value.

[0090] The number of turns of the wire aggregate portion 44 on the winding core 45 is 15 or more (31 turns). With a structure with 15 or more turns, the common mode choke coil 51 can obtain an inductance value of 50 μH or more when the plane size is 4.5 mm×3.2 mm.

[0091] In addition, although not shown, in the twisted wire portion of the first and second wires 41 and 42, the number of twists per turn is 0.5 or more and 8 or less, preferably 4 or more and 8 or less. In this way, by making the number of twists greater than or equal to a predetermined number, the effect of improving the mode conversion characteristics can be enhanced. In addition, by making the number of twists less than or equal to a predetermined number, the reliability and manufacturing efficiency of the common mode choke coil 51 can be ensured.

[0092] In addition, although not shown, the first and second wires 41 and 42 are not twisted in the outward transition portion S and the inward transition portion T. The outward transition portion S is a portion on which the outer peripheral portion G is wound, and the inward transition portion T is a portion that becomes the outermost portion of the wire aggregate portion 44. Both the portions S and T are portions of the winding state of the left and right wire aggregate portions 44. Therefore, by preventing this portion from becoming a stranded wire portion with a large degree of disorder in the winding state, the winding state of the wire aggregate portion 44 can be made more orderly, thereby reducing deviations. In addition, in the production process, the winding of the wire aggregate portion 44 can be stably performed.

[0093] Although not shown in the figure, the wire aggregate portion 44 may be wound in the middle of the winding process. Fig.17 The Z twist shown in (A) is Fig.17 The direction of twisting applied to the wire aggregate portion 44 is switched between the S twists shown in (B). Such switching of the twist direction can be easily achieved by applying, for example, the method described in Japanese Patent No. 5239822.

[0094] In addition, from Figure 1 As can be seen from the position of the outward transition portion S shown in (A), the outward transition portion S and the inward transition portion T do not exist in any part of the portion of the winding core 45 that is opposite to the plate-shaped core 59 and the portion on the opposite side of the portion. The outward transition portion S and the inward transition portion T have the possibility of causing the winding body of the wire aggregate portion 44 to expand locally in the portion where they exist. According to the above structure, it is possible to position the local expansion of the winding body of the wire aggregate portion 44, avoiding the portion of the winding core 45 that is easily restricted in space, such as the portion of the winding core 45 that is opposite to the plate-shaped core 59 and the portion on the opposite side of the portion. As a result, even with the same outer shape, the winding core 45 can be made thicker, thereby achieving improved electrical characteristics and improved mechanical strength.

[0095] The above features are also applicable to other embodiments unless otherwise specified.

[0096] exist Figure 3 Shown in Figure 1 and Figure 2 The frequency characteristics of the S parameter (Sds21) of the common mode choke coil 51 are shown in FIG. 5 . In order to easily evaluate the mode conversion characteristics of the common mode choke coil 51, Figure 3 It is also shown in Fig. 20 As shown in Fig.18 The Sds21 of the common mode choke coil (Comparative Example 1) and Fig.19 The common mode choke coil (Comparative Example 2) has Sds21. Figure 3In FIG. 1 , Sds21 of the common mode choke coil 51 (Example 1) is indicated by a solid line, Sds21 of Comparative Example 1 is indicated by a dotted line, and Sds21 of Comparative Example 2 is indicated by a dashed line.

[0097] like Figure 3 As shown, with respect to the mode conversion characteristic (Sds21), Comparative Example 1 is the best, and then the value becomes higher in the order of Example 1 and Comparative Example 2.

[0098] As described above, in Comparative Example 1, the wire aggregate portion 44 is wound in a single layer, so it is impossible to generate inter-wire capacitance between the inner layer side and the outer layer side of the wire aggregate portion 44, and thus the mode conversion characteristics are the best. On the other hand, in Example 1 and Comparative Example 2, inter-wire capacitance between the inner layer side and the outer layer side of the wire aggregate portion 44 is generated. Therefore, the mode conversion characteristics of Example 1 and Comparative Example 2 are inferior to the mode conversion characteristics of Comparative Example 1.

[0099] When Example 1 is compared with Comparative Example 2, the difference in the number of turns between the wire aggregate portion 44 located on the inner layer side and the wire aggregate portion 44 located on the outer layer side is smaller in Example 1 than in Comparative Example 2.

[0100] That is, in Example 1, for example, turns 6 and 7 of the wire aggregate portion 44 located on the outer layer side are adjacent to turn 2 of the wire aggregate portion 44 located on the inner layer side. In addition, turns 16 and 17 of the wire aggregate portion 44 located on the outer layer side are adjacent to turn 10 of the wire aggregate portion 44 located on the inner layer side. In addition, turns 27 and 28 of the wire aggregate portion 44 located on the outer layer side are adjacent to turn 22 of the wire aggregate portion 44 located on the inner layer side. Therefore, the difference in the number of turns between the wire aggregate portion 44 located on the inner layer side and the wire aggregate portion 44 located on the outer layer side is 4 to 7.

[0101] In contrast, in Comparative Example 2, turns 17 and 18 of the wire aggregate portion 44 located on the outer layer side are adjacent to turn 2 of the wire aggregate portion 44 located on the inner layer side. Therefore, the difference in the number of turns between the wire aggregate portion 44 located on the inner layer side and the wire aggregate portion 44 located on the outer layer side is as large as 15 to 16.

[0102] Therefore, the line capacitance of the common mode signal of the entire wire assembly portion 44 is smaller in Example 1 than in Comparative Example 2. It can be inferred that the mode conversion characteristics of Example 1 are better than those of Comparative Example 2 due to the difference in line capacitance.

[0103] The data used as the basis for the above-mentioned estimation are shown below.

[0104] exist Figure 4FIG. 2 shows the frequency characteristics of the difference (S21-S31) between S21 and S31, which is a constituent parameter of the mode conversion characteristics of the first embodiment and the second comparative example, divided into (A) a real part and (B) an imaginary part. Figure 4 For S21-S31 shown in FIG. 1 , the closer the (A) real number part and the (B) imaginary number part are to 0, the better the mode conversion characteristics can be evaluated. Figure 5 2 shows the frequency characteristics of the parasitic capacitance of the entire coil in the common mode in Example 1 and Comparative Example 2.

[0105] Usually, it is unimaginable Figure 4 S21-S31 shown with Figure 5 However, the inventors of the present application found that: for Comparative Example 2, if the reference Figure 4 S21-S31 shown with Figure 5 The common mode capacitance shown in FIG. 1 is the peak frequency region of the common mode capacitance, and S21-S31 is far away from 0, and the mode conversion characteristics are deteriorated. On the other hand, it can be seen that in Example 1, Figure 5 There is no obvious peak in the common mode capacitance characteristics shown. Figure 4 As for S21-S31 shown, it is closer to 0 than that of Comparative Example 2, and the mode conversion characteristics are good.

[0106] Thus, the inventor of the present application found that: Figure 4 S21-S31 shown with Figure 5 There is a correlation between the common-mode capacitances shown.

[0107] Therefore, the inventor of the present application thought: in the process of studying the desire to reduce (not increase) the peak value of the common-mode capacitance, when in common mode, the signal propagates in the same phase in the two wires that constitute the wire assembly part, so the two wires with the same number of turns are at the same potential with each other, so no parasitic capacitance is generated. Therefore, even in the twisted wire state where the two wires are twisted, is it possible to adopt the same idea of ​​reducing capacitance as when using a single wire in common mode?

[0108] That is, in Comparative Example 2, the wire aggregate portion 44 is wound in two layers, but as described above, the difference in the number of turns is large between the wire aggregate portion 44 located on the inner layer side and the wire aggregate portion 44 located on the outer layer side. If the difference in the number of turns between adjacent turns increases, the relative influence of the inter-wire capacitance generated between the above turns on the parasitic capacitance value observed in the common mode choke coil as a whole increases, thereby generating a large inter-wire capacitance.

[0109] In contrast, in Example 1, the first outer layer portion Ga is composed of the wire aggregate portion 44 drawn from the middle position in the winding center axis direction of the inner layer portion N and returned to the middle position, so the difference in the number of turns between the wire aggregate portion 44 constituting the first outer layer portion Ga and the wire aggregate portion 44 constituting the inner layer portion N located inside the first outer layer portion Ga can be made smaller than that in Comparative Example 2. Therefore, as Figure 5 As shown, the common mode capacitance in Example 1 can be made smaller than that in Comparative Example 2.

[0110] In addition, for reference, Fig.18 In the comparative example 1 shown, the wire aggregate portion 44 is wound in a single layer, so the structure in which the wire aggregate portion 44 exists on the inner layer side and the outer layer side does not occur. That is, only the inter-wire capacitance (i.e., series capacitance) between consecutive turn numbers is generated, and the inter-wire capacitance (parallel capacitance) with a large difference in the turn number that has a large impact on the total parasitic capacitance is not generated, and the total parasitic capacitance is small.

[0111] On the other hand, comparing the number of turns of the wire aggregate portion 44, Example 1 and Comparative Example 2 are 31, whereas Comparative Example 1 is as small as 16. Therefore, it can be easily inferred that the inductance values ​​of Example 1 and Comparative Example 2 are higher than the inductance value of Comparative Example 1.

[0112] Based on the above viewpoints, it can be seen that only Example 1 can achieve both good mode conversion characteristics and high inductance value.

[0113] Second embodiment

[0114] Next, refer to Figure 6 A common mode choke coil 51a according to a second embodiment of the present invention will be described. Figure 6 and the following Figure 8 to Figure 15 In, with Figure 2 Corresponding elements are denoted by the same reference numerals, and duplicate description is omitted.

[0115] The common mode choke coil 51a has a larger number of turns of the wire assembly portion 44 than the common mode choke coil 51 described above. That is, the number of turns is 37. In addition, in the common mode choke coil 51, there are three outward transition portions S around the winding core portion 45, but in the common mode choke coil 51a, there are five outward transition portions S. Therefore, in the common mode choke coil 51a, five outer layer portions G are formed, and more specifically, four first outer layer portions Ga and one second outer layer portion Gb are formed.

[0116] For the common mode choke coil 51a, the winding shape of the wire assembly portion 44 is 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 composed of turns 1 to 4, and then the portion transitioning from turn 4 to turn 5 constitutes the outward transition portion S. Then, the first outer layer portion Ga is composed of turns 5 to 7, and then the portion transitioning from turn 7 to turn 8 constitutes the inward transition portion T.

[0117] Next, the inner layer part N is formed by turns 8 to 11, and then the outward transition part S is formed by the part transitioning from turn 11 to turn 12. Next, the first outer layer part Ga is formed by turns 12 to 15, and then the inward transition part T is formed by the part transitioning from turn 15 to turn 16.

[0118] Next, the inner layer part N is formed by turns 16 to 19, and then the outward transition part S is formed by the part transitioning from turn 19 to turn 20. Next, the first outer layer part Ga is formed by turns 20 to 23, and then the inward transition part T is formed by the part transitioning from turn 23 to turn 24.

[0119] Next, the inner layer part N is formed by turns 24 to 27, and then the outward transition part S is formed by the part transitioning from turn 27 to turn 28. Next, the first outer layer part Ga is formed by turns 28 to 31, and then the inward transition part T is formed by the part transitioning from turn 31 to turn 32.

[0120] Next, the turns 32 to 34 constitute the inner layer portion N, and then the portion transitioning from the turn 34 to the turn 35 constitutes the outer transition portion S, and then the turns 35 to 37 constitute the second outer layer portion Gb.

[0121] exist Figure 7 The frequency characteristics of Sds21 of the common mode choke coil 51a are shown in FIG. Figure 7 In order to facilitate the evaluation of the mode conversion characteristics of the common mode choke coil 51a (Example 2), the Figure 3 Sds21 of the common mode choke coil 51 (Example 1) shown in FIG. Figure 7 In FIG. 1 , Sds21 of the common mode choke coil 51 (Example 1) is indicated by a solid line, and Sds21 of the common mode choke coil 51a (Example 2) is indicated by a dotted line.

[0122] like Figure 7 As shown, it can be observed that the mode conversion characteristics (Sds21) of Example 2 are improved compared with Example 1. It is speculated that this improvement is because: in Example 2, the number of outward transition parts S is larger than that of Example 1, which can reduce the difference in the number of turns of the part generating the line capacitance between the inner layer part N and the outer layer part G.

[0123] Third embodiment

[0124] Next, refer to Figure 8 A common mode choke coil 51 b according to a third embodiment of the present invention will be described.

[0125] The common mode choke coil 51b is, for example, Figure 2 Compared with the common mode choke coil 51 shown, although the number of turns of the wire assembly portion 44 is the same, the number of the outward transition portions S and the inward transition portions T is greater.

[0126] For the common mode choke coil 51b, the winding shape of the wire assembly portion 44 is described according to the turn number of the wire assembly portion 44 on the winding core portion 45. First, the inner layer portion N is composed of turns 1 to 2, then the portion transitioning from turn 2 to turn 3 constitutes the outward transition portion S, then the first outer layer portion Ga is composed of turn 3, and then the portion transitioning from turn 3 to turn 4 constitutes the inward transition portion T.

[0127] Next, the inner layer part N is formed by turns 4 to 5, and then the outward transition part S is formed by the part transitioning from turn 5 to turn 6. Next, the first outer layer part Ga is formed by turns 6 to 7, and then the inward transition part T is formed by the part transitioning from turn 7 to turn 8.

[0128] Then, the same winding state is repeated, and finally, the inner layer part N is formed by turns 28 to 29, and then the outer transition part S is formed by the part transitioning from turn 29 to turn 30, and then the second outer layer part Gb is formed by turns 30 to 31.

[0129] According to the third embodiment, the number of outward transition portions S is increased to 8 compared to the first embodiment, and as a result, the difference in the number of turns of the portion generating line capacitance between the inner layer portion N and the outer layer portion G can be reduced.

[0130] [Fourth Embodiment]

[0131] Next, refer to Fig. 9 A common mode choke coil 51c according to a fourth embodiment of the present invention will be described.

[0132] The common mode choke coil 51c is, for example, Figure 8 Compared with the common mode choke coil 51b shown, although the number of turns of the wire assembly portion 44 is the same, the number of the outward transition portion S and the inward transition portion T is further increased.

[0133] For the common mode choke coil 51c, the winding shape of the wire assembly portion 44 is described according to the turn number of the wire assembly portion 44 on the winding core portion 45. First, the inner layer portion N is composed of turns 1 to 2, then the portion transitioning from turn 2 to turn 3 constitutes the outward transition portion S, then the first outer layer portion Ga is composed of turn 3, and then the portion transitioning from turn 3 to turn 4 constitutes the inward transition portion T.

[0134] Next, the inner layer part N is formed by turn 4, and then the outward transition part S is formed by the part transitioning from turn 4 to turn 5. Then, the first outer layer part Ga is formed by turn 5, and then the inward transition part T is formed by the part transitioning from turn 5 to turn 6.

[0135] Then, the same winding state is repeated, and finally, the inner layer part N is formed by the turn 30, and then the outer transition part S is formed by the part transitioning from the turn 30 to the turn 31, and then the second outer layer part Gb is formed by the turn 31.

[0136] According to the fourth embodiment, the number of outward transition portions S is further increased to 15 compared to the third embodiment, and as a result, the difference in the number of turns of the portion generating line capacitance between the inner layer portion N and the outer layer portion G can be further reduced.

[0137] Fifth embodiment

[0138] Next, refer to Fig.10 A common mode choke coil 51d according to a fifth embodiment of the present invention will be described.

[0139] The common mode choke coil 51d is, for example, Figure 2 Compared with the common mode choke coil 51 shown, the number of turns of the wire assembly part 44 is less, but the number of the outward transition part S and the inward transition part T is the same. In addition, in the common mode choke coil 51d, the inner layer part N and the outer layer part G are divided into three groups, and spaces are provided between adjacent groups.

[0140] Regarding the common mode choke coil 51d, the winding form of the wire assembly part 44 is described according to the number of turns of the wire assembly part 44 on the winding core part 45. First, the inner layer part N is composed of turns 1 to 5, then the transition part from turn 5 to turn 6 constitutes the outward transition part S, then the first outer layer part Ga is composed of turns 6 to 9, and then the transition part from turn 9 to turn 10 constitutes the inward transition part T. A space is provided between turns 9 and 10.

[0141] Next, the inner layer portion N is formed by turns 10 to 14, and then the outer transition portion S is formed by the transition portion from turn 14 to turn 15. Then, the first outer layer portion Ga is formed by turns 15 to 18, and then the inner transition portion T is formed by the transition portion from turn 18 to turn 19. A space is provided between turns 18 and 19.

[0142] Next, the inner layer portion N is formed by turns 19 to 22, and then the outer transition portion S is formed by the portion transitioning from turn 22 to turn 23, and then the second outer layer portion Gb is formed by turns 23 to 25.

[0143] The fifth embodiment contributes to the diversification of the embodiments of the present invention. Specifically, as in the fifth embodiment, it is shown that the position of the lead-out through the outward transition portion S and the position of the return through the inward transition portion T, that is, the middle position of the inner layer portion N may not be a point but a range with a width. That is, the two positions do not need to be strictly consistent as points, and the range from the lead-out point to the return point, such as the range from turn 5 to turn 10 and the range from turn 14 to turn 19 in the fifth embodiment, can be respectively used as the middle position.

[0144] Sixth Embodiment

[0145] Next, refer to Fig.11 A common mode choke coil 51 e according to a sixth embodiment of the present invention will be described.

[0146] The common mode choke coil 51e is, for example, Figure 2 Compared with the common mode choke coil 51 shown in FIG. 1 , the second outer layer portion Gb does not exist, and accordingly, the number of turns of the wire assembly portion 44 is reduced. In the common mode choke coil 51e, the portion from turn 1 to turn 26 is smaller than that of the common mode choke coil 51e. Figure 2 The same is true for the common mode choke coil 51 shown. Furthermore, turn 26 is the final turn.

[0147] The sixth embodiment contributes to diversification of the embodiments of the present invention.

[0148] Seventh embodiment

[0149] Next, refer to Fig.12 A common mode choke coil 51f according to a seventh embodiment of the present invention will be described.

[0150] The common mode choke coil 51f is, for example, Figure 2 Compared with the common mode choke coil 51 shown, the number of turns of the wire aggregate portion 44 is the same, but the winding direction of the outer layer portion G is opposite. That is, in the outer layer portion G, the wire aggregate portion 44 is wound from the second end portion 47 side toward the first end portion 46 side.

[0151] Regarding the common mode choke coil 51f, the winding form of the wire aggregate portion 44 is described according to the number of turns of the wire aggregate portion 44 on the winding core portion 45. First, the inner layer portion N is formed by turns 1 to 5, then the portion transitioning from turn 5 to turn 6 forms the outer transition portion S, then the first outer layer portion Ga is formed by turns 6 to 9, and then the portion transitioning from turn 9 to turn 10 forms the inner transition portion T. The turns 6 to 9 are wound from the second end portion 47 side toward the first end portion 46 side.

[0152] Next, the inner layer portion N is formed by turns 10 to 15, and then the transition portion from turn 15 to turn 16 forms the outward transition portion S. Then, turns 16 to 21 form the first outer layer portion Ga, and then the transition portion from turn 21 to turn 22 forms the inward transition portion T. Here, the turns 16 to 21 are also wound from the second end portion 47 side toward the first end portion 46 side.

[0153] Next, the turns 22 to 26 form the inner layer portion N, then the transition portion from the turn 26 to the turn 27 forms the outer transition portion S, and then the turns 27 to 31 form the second outer layer portion Gb. The turns 27 to 31 are also wound from the second end 47 side toward the first end 46 side.

[0154] In the outer layer portion G of the common mode choke coil 51f, the wire aggregate portion 44 is wound from the second end portion 47 side toward the first end portion 46 side. Figure 2 Compared with the case where the wire aggregate portion 44 is wound from the first end portion 46 side toward the second end portion 47 side as in the common mode choke coil 51 of FIG. 1 , a position is formed where the difference in the number of turns between adjacent turns between the wire aggregate portion 44 constituting the outer layer portion G and the wire aggregate portion 44 constituting the inner layer portion N located inside the outer layer portion G becomes quite large. However, unlike the above Fig.19 Compared with the structure shown, the difference in the number of turns can be reduced.

[0155] In addition, Figure 2 Compared with the common mode choke coil 51 of FIG. 5 , the outward transition portion S can be shortened. Unlike the inward transition portion T, the outward transition portion S is a portion on 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 this portion, in the common mode choke coil 51f, the deviation of the winding state can be reduced, and the reduction of characteristic deviation, miniaturization, reliability, and improvement of production efficiency can be achieved.

[0156] Eighth Embodiment

[0157] Next, refer to Fig.13 A common mode choke coil 51g according to an eighth embodiment of the present invention will be described.

[0158] The common mode choke coil 51g is characterized by the position of the turn 3 that appears on the first end 46 side and becomes the starting end of the first outer layer portion G. That is, the turn 3 is closer to the first end 46 side than the turn 1 that appears on the first end 46 side and becomes the starting end of the first inner layer portion N. Such a structure can be realized by making the turn 3 abut against the first flange portion 53, for example.

[0159] For the common mode choke coil 51g, the winding shape of the wire assembly portion 44 is described according to the turn number of the wire assembly portion 44 on the winding core portion 45. First, the inner layer portion N is composed of turns 1 to 2, and then the portion transitioning from turn 2 to turn 3 constitutes the outward transition portion S. Then, the first outer layer portion Ga is composed of turns 3 to 4, and then the portion transitioning from turn 4 to turn 5 constitutes the inward transition portion T.

[0160] Next, the inner layer part N is formed by turns 5 to 6, and then the outward transition part S is formed by the part transitioning from turn 6 to turn 7. Then, the first outer layer part Ga is formed by turns 7 to 8, and then the inward transition part T is formed by the part transitioning from turn 8 to turn 9.

[0161] Then, the same winding state is repeated.

[0162] The eighth embodiment contributes to diversification of the embodiments of the present invention.

[0163] Ninth embodiment

[0164] Next, refer to Fig.14 A common mode choke coil 51h according to a ninth embodiment of the present invention will be described.

[0165] In the first to eighth embodiments described above, the wire aggregate portion 44 constituting the outer layer portion G is embedded in the recessed portion formed between the adjacent turns of the wire aggregate portion 44 constituting the inner layer portion N. In contrast, the ninth embodiment is characterized in that the turns of the wire aggregate portion 44 constituting the outer layer portion G are arranged in the radial direction of the winding core 45 relative to the turns of the wire aggregate portion 44 constituting the inner layer portion N. This arrangement state is difficult to achieve using a wire in a single-wire state, but can be achieved relatively easily with the wire aggregate portion 44. This is because concave and convex portions that can be entangled with each other are formed on the surface of the wire aggregate portion 44.

[0166] For the common mode choke coil 51h, the winding shape of the wire assembly portion 44 is described according to the turn number of the wire assembly portion 44 on the winding core portion 45. First, the inner layer portion N is composed of turn 1, and then the outward transition portion S is composed of the portion transitioning from turn 1 to turn 2. Then, the first outer layer portion Ga is composed of turn 2, and then the inward transition portion T is composed of the portion transitioning from turn 2 to turn 3.

[0167] Next, the inner layer part N is formed by turn 3, and then the outward transition part S is formed by the part transitioning from turn 3 to turn 4. Then, the first outer layer part Ga is formed by turn 4, and then the inward transition part T is formed by the part transitioning from turn 4 to turn 5.

[0168] Then, the same winding state is repeated.

[0169] The ninth embodiment contributes to the diversification of the embodiments of the present invention. In particular, in the case of the ninth embodiment, the difference in the number of turns of the portion generating the inter-wire capacitance can be reduced. In addition, in the case of the ninth embodiment, a greater number of windings of the wire aggregate portion 44 can be achieved relative to the same length of the winding core portion 45. Thus, in the ninth embodiment, both good mode conversion characteristics and high inductance values ​​can be obtained.

[0170] Tenth embodiment

[0171] Next, refer to Fig.15 A common mode choke coil 51i according to a tenth embodiment of the present invention will be described.

[0172] The common mode choke coil 51i is characterized in that the wire aggregate portion 44 is wound in three layers.

[0173] For the common mode choke coil 51i, the winding shape of the wire assembly portion 44 is described according to the turn number of the wire assembly portion 44 on the winding core portion 45. First, the inner layer portion N is composed of turns 1 to 2, then the portion transitioning from turn 2 to turn 3 constitutes the outward transition portion S, then the middle layer portion C is composed of turn 3, and then the portion transitioning from turn 3 to turn 4 constitutes the inward transition portion T.

[0174] Next, the inner layer part N is formed by turns 4 to 5, and then the outward transition part S is formed by the part transitioning from turn 5 to turn 6. Next, the middle layer part C is formed by turns 6 to 7, and then the outward transition part S is formed by the part transitioning from turn 7 to turn 8.

[0175] Next, the outer layer portion G is formed by turns 8 to 9, and then the same winding state is repeated.

[0176] The tenth embodiment contributes to diversification of the embodiments of the present invention.

[0177] exist Fig.16 A preferred example of the cross-sectional shape of the winding core 45 perpendicular to the winding central axis is shown.

[0178] The cross-sectional shape of the winding core 45 is generally rectangular, but is not particularly limited thereto. Fig.16 The circular shape shown in (A) or a shape close thereto, for example Fig.16 The oval shown in (B) or Fig.16 When the corners are rounded in a polygonal shape such as a rectangle as shown in (C), the stranded wire state and the winding shape of the wire aggregate portion 44 are less likely to collapse. In particular, the winding shape is prone to collapse in the stranded wire portion, and the selection of the cross-sectional shape of the winding core portion 45 as described above has a much greater effect than when there is no stranded wire portion.

[0179] In addition, Figure 1 In the common mode choke coil 51 shown, the first and second terminal electrodes 55 and 56 are provided on the first flange portion 53 , and the third and fourth terminal electrodes 57 and 58 are provided on the second flange portion 54 . However, all the terminal electrodes may be provided on either flange portion.

[0180] The present invention has been described above in relation to the embodiment of the common mode choke coil shown in the figure, but the present invention can also be applied to a balanced-unbalanced transformer (balun), a transformer (transformer), etc. In addition, the various embodiments shown in the figure are only examples, and it should be pointed out that partial replacement or combination of structures can be performed between different embodiments.

[0181] In addition, the wire aggregate portion 44 only needs to have a stranded portion in which the first and second wires 41 and 42 are twisted with each other at least partially, thereby reducing the characteristic degradation caused by the imbalance of the inter-wire capacitance compared to the case where there is no stranded portion at all. In addition, from the perspective of reducing the characteristic degradation, it is preferred that the portion occupied by the stranded portion is large. It is particularly preferred that the portion other than the outward transition portion S and the inward transition portion T, that is, the inner peripheral portion N and the outer peripheral portion G are the stranded portion, in which case a balance between the winding state and the characteristics can be obtained.

[0182] However, it is also possible to construct a structure in which only one of the inner peripheral portion N or the outer peripheral portion G is a twisted wire portion. In particular, when only the outer peripheral portion G is a twisted wire portion, the inner peripheral portion N on which the wire assembly portion 44 is wound around itself can be a non-twisted wire portion with a less chaotic winding state, thereby achieving an improved winding state.

[0183] In addition, in the above-mentioned embodiment, the first and second wires 41 and 42 wound around the winding core 45 are almost entirely the wire aggregate portion 44, but the present invention is not limited thereto, and the wire aggregate portion 44 may be a portion of the portion wound around the winding core 45. That is, there may be positions around the winding core 45 where the first and second wires 41 and 42 are wound in different directions or are wound separately.

[0184] In addition, in the above-mentioned embodiment, the first and second wires 41 and 42 have substantially the same number of turns, but the present invention is not limited thereto, and the number of turns may be different.

Claims

1. A coil component, wherein: The coil component comprises: a drum core having a winding core portion and first and second flange portions respectively provided at first and second ends of the winding core portion that are opposite to each other; and The first and second wires are wound around the winding core and are not electrically connected to each other. The first and second wires have a wire assembly portion wound together in the same direction around the winding core portion. The wire aggregate portion includes a stranded wire portion in which the first and second wires are twisted together, and the structure is as follows: an inner layer portion which is wound in contact with the peripheral surface of the winding core portion; an outer layer portion wound around the outer circumference of the inner layer portion; an outward transition portion that transitions from the inner layer portion to the outer layer portion; and an inward transition portion, which transitions from the outer layer portion to the inner layer portion, In the inner layer portion, the wire aggregate portion is wound from the first end side toward the second end side, In the outer layer portion, the wire aggregate portion is wound from the second end side toward the first end side, The outer layer portion includes a first outer layer portion, which is composed of the wire aggregate portion that is led out from the middle position in the winding center axis direction of the inner layer portion by means of the outward transition portion and returns to the middle position of the inner layer portion by means of the inward transition portion, In each of the wire aggregate portion located between the first end portion and the inward transition portion closest to the first end portion, the wire aggregate portion located between adjacent inward transition portions, and the wire aggregate portion located between the second end portion and the inward transition portion closest to the second end portion, the difference in the number of turns between the adjacent wire aggregate portion located in the inner layer portion and the wire aggregate portion located in the outer layer portion is less than 11.

2. A coil component, wherein: The coil component comprises: a drum core having a winding core portion and first and second flange portions respectively provided at first and second ends of the winding core portion that are opposite to each other; and The first and second wires are wound around the winding core and are not electrically connected to each other. The first and second wires have a wire assembly portion wound together in the same direction around the winding core portion. The wire aggregate portion includes a stranded wire portion in which the first and second wires are twisted together, and the structure is as follows: an inner layer portion which is wound in contact with the peripheral surface of the winding core portion; an outer layer portion wound around the outer circumference of the inner layer portion; an outward transition portion that transitions from the inner layer portion to the outer layer portion; and an inward transition portion, which transitions from the outer layer portion to the inner layer portion, In the stranded wire portions of the first and second wires, the number of twists per turn is greater than or equal to 0.5 and less than or equal to 8. The outer layer portion includes a first outer layer portion, which is composed of the wire aggregate portion that is led out from the middle position in the winding center axis direction of the inner layer portion by means of the outward transition portion and returns to the middle position of the inner layer portion by means of the inward transition portion, In each of the wire aggregate portion located between the first end portion and the inward transition portion closest to the first end portion, the wire aggregate portion located between adjacent inward transition portions, and the wire aggregate portion located between the second end portion and the inward transition portion closest to the second end portion, the difference in the number of turns between the adjacent wire aggregate portion located in the inner layer portion and the wire aggregate portion located in the outer layer portion is less than 11.

3. A coil component, wherein: The coil component comprises: a drum core having a winding core portion and first and second flange portions respectively provided at first and second ends of the winding core portion that are opposite to each other; and The first and second wires are wound around the winding core and are not electrically connected to each other. The first and second wires have a wire assembly portion wound together in the same direction around the winding core portion. The wire aggregate portion includes a stranded wire portion in which the first and second wires are twisted together, and the structure is as follows: an inner layer portion which is wound in contact with the peripheral surface of the winding core portion; an outer layer portion wound around the outer circumference of the inner layer portion; an outward transition portion that transitions from the inner layer portion to the outer layer portion; and an inward transition portion, which transitions from the outer layer portion to the inner layer portion, In the outward transition portion and the inward transition portion, the first and second wires are not twisted. The outer layer portion includes a first outer layer portion, which is composed of the wire aggregate portion that is led out from the middle position in the winding center axis direction of the inner layer portion by means of the outward transition portion and returns to the middle position of the inner layer portion by means of the inward transition portion, In each of the wire aggregate portion located between the first end portion and the inward transition portion closest to the first end portion, the wire aggregate portion located between adjacent inward transition portions, and the wire aggregate portion located between the second end portion and the inward transition portion closest to the second end portion, the difference in the number of turns between the adjacent wire aggregate portion located in the inner layer portion and the wire aggregate portion located in the outer layer portion is less than 11.

4. A coil component, wherein: The coil component comprises: a drum core having a winding core portion and first and second flange portions respectively provided at first and second ends of the winding core portion that are opposite to each other; and The first and second wires are wound around the winding core and are not electrically connected to each other. The first and second wires have a wire assembly portion wound together in the same direction around the winding core portion. The wire aggregate portion includes a stranded wire portion in which the first and second wires are twisted together, and the structure is as follows: an inner layer portion which is wound in contact with the peripheral surface of the winding core portion; an outer layer portion wound around the outer circumference of the inner layer portion; an outward transition portion that transitions from the inner layer portion to the outer layer portion; and an inward transition portion, which transitions from the outer layer portion to the inner layer portion, The outer layer portion includes a first outer layer portion, which is composed of the wire aggregate portion that is led out from the middle position in the winding center axis direction of the inner layer portion by means of the outward transition portion and returns to the middle position of the inner layer portion by means of the inward transition portion, The inner layer portion includes a portion on the outer circumference of the inner layer portion where the outer layer portion is not wound, In each of the wire aggregate portion located between the first end portion and the inward transition portion closest to the first end portion, the wire aggregate portion located between adjacent inward transition portions, and the wire aggregate portion located between the second end portion and the inward transition portion closest to the second end portion, the difference in the number of turns between the adjacent wire aggregate portion located in the inner layer portion and the wire aggregate portion located in the outer layer portion is less than 11.

5. A coil component, wherein: The coil component comprises: a drum core having a winding core portion and first and second flange portions respectively provided at first and second ends of the winding core portion that are opposite to each other; and The first and second wires are wound around the winding core and are not electrically connected to each other. The first and second wires have a wire assembly portion wound together in the same direction around the winding core portion. The wire aggregate portion includes a stranded wire portion in which the first and second wires are twisted together, and the structure is as follows: an inner layer portion which is wound in contact with the peripheral surface of the winding core portion; an outer layer portion wound around the outer circumference of the inner layer portion; an outward transition portion that transitions from the inner layer portion to the outer layer portion; and an inward transition portion, which transitions from the outer layer portion to the inner layer portion, The outer layer portion includes a first outer layer portion, which is composed of the wire aggregate portion that is led out from the middle position in the winding center axis direction of the inner layer portion by means of the outward transition portion and returns to the middle position of the inner layer portion by means of the inward transition portion, The inner layer part and the outer layer part are divided into a plurality of groups, and spaces are provided between adjacent groups. In each of the wire aggregate portion located between the first end portion and the inward transition portion closest to the first end portion, the wire aggregate portion located between adjacent inward transition portions, and the wire aggregate portion located between the second end portion and the inward transition portion closest to the second end portion, the difference in the number of turns between the adjacent wire aggregate portion located in the inner layer portion and the wire aggregate portion located in the outer layer portion is less than 11.

6. A coil component, wherein: The coil component comprises: a drum core having a winding core portion and first and second flange portions respectively provided at first and second ends of the winding core portion that are opposite to each other; and The first and second wires are wound around the winding core and are not electrically connected to each other. The first and second wires have a wire assembly portion wound together in the same direction around the winding core portion. The wire aggregate portion includes a stranded wire portion in which the first and second wires are twisted together, and the structure is as follows: an inner layer portion which is wound in contact with the peripheral surface of the winding core portion; an outer layer portion wound around the outer circumference of the inner layer portion; an outward transition portion that transitions from the inner layer portion to the outer layer portion; and an inward transition portion, which transitions from the outer layer portion to the inner layer portion, The outer layer portion includes a first outer layer portion, which is composed of the wire aggregate portion that is led out from the middle position in the winding center axis direction of the inner layer portion by means of the outward transition portion and returns to the middle position of the inner layer portion by means of the inward transition portion, There are multiple outward transition parts and multiple inward transition parts. The inner layer portion includes portions having different numbers of turns from the inward transition portion to the outward transition portion, In each of the wire aggregate portion located between the first end portion and the inward transition portion closest to the first end portion, the wire aggregate portion located between adjacent inward transition portions, and the wire aggregate portion located between the second end portion and the inward transition portion closest to the second end portion, the difference in the number of turns between the adjacent wire aggregate portion located in the inner layer portion and the wire aggregate portion located in the outer layer portion is less than 11.

7. A coil component, wherein: The coil component comprises: a drum core having a winding core portion and first and second flange portions respectively provided at first and second ends of the winding core portion that are opposite to each other; and The first and second wires are wound around the winding core and are not electrically connected to each other. The first and second wires have a wire assembly portion wound together in the same direction around the winding core portion. The wire aggregate portion includes a stranded wire portion in which the first and second wires are twisted together, and the structure is as follows: an inner layer portion which is wound in contact with the peripheral surface of the winding core portion; an outer layer portion wound around the outer circumference of the inner layer portion; an outward transition portion that transitions from the inner layer portion to the outer layer portion; and an inward transition portion, which transitions from the outer layer portion to the inner layer portion, The outer layer portion includes a first outer layer portion, which is composed of the wire aggregate portion that is led out from the middle position in the winding center axis direction of the inner layer portion by means of the outward transition portion and returns to the middle position of the inner layer portion by means of the inward transition portion, The first and second flange portions have at least one surface along the winding center axis. The coil component also has: First and second terminal electrodes are provided on at least one side of the first flange portion and are connected to one end of the first wire and one end of the second wire, respectively. third and fourth terminal electrodes, which are provided on at least one side of the second flange portion and are connected to the other end of the first wire and the other end of the second wire, respectively; and a plate-like core which is arranged between the first and second flange portions in a state of being in contact with the opposite side of the first and second flange portions, The outward transition portion and the inward transition portion do not exist in the portion of the winding core portion that is opposite to the plate-shaped core, In each of the wire aggregate portion located between the first end portion and the inward transition portion closest to the first end portion, the wire aggregate portion located between adjacent inward transition portions, and the wire aggregate portion located between the second end portion and the inward transition portion closest to the second end portion, the difference in the number of turns between the adjacent wire aggregate portion located in the inner layer portion and the wire aggregate portion located in the outer layer portion is less than 11.

8. The coil component according to claim 7, wherein The outward transition portion and the inward transition portion also do not exist on the opposite side of the portion of the winding core portion that is opposed to the plate-like core.

9. The coil component according to any one of claims 1 to 7, wherein: The wire aggregate portion around the winding core portion constitutes the first outer layer portion at a plurality of locations.

10. The coil component according to any one of claims 1 to 7, wherein: The outer layer portion further includes a second outer layer portion which is composed of the wire aggregate portion which is led out from a position of the inner layer portion on the second end side via the outward transition portion.

11. The coil component according to any one of claims 1 to 7, wherein: The outward transition portions exist at two or more and five or less locations around the winding core.

12. The coil component according to any one of claims 1 to 7, wherein: The number of turns of the wire aggregate wound around the winding core is 15 or more.

13. The coil component according to any one of claims 1 to 7, wherein: The wire aggregate portion is formed into a stranded wire portion at least in both the inner layer portion and the outer layer portion.

14. The coil component according to any one of claims 1 to 7, wherein: The cross-sectional shape of the winding core portion perpendicular to the winding central axis is circular, elliptical, or a polygon with rounded corners.

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