Common mode noise filter

Abstract

To provide a common mode noise filter capable of reducing a possibility of deterioration of mode conversion characteristics.SOLUTION: A common mode noise filter 1 includes: multiple insulator layers 20; a first coil conductor 31, a second coil conductor 32, a third coil conductor 33, a fourth coil conductor 34, a fifth coil conductor 35, and a sixth coil conductor 36. A relation of a vertical first distance I1 from a top surface 311 of the first coil conductor 31 to a bottom surface 332 of the third coil conductor 33, a vertical second distance I2 from a top surface 341 of the fourth coil conductor 34 to a lower surface 362 of the sixth coil conductor 36, and a vertical third distance I3 from a bottom surface 332 of the third coil conductor 33 to a top surface 341 of the fourth coil conductor 34 satisfies I1<I3 and I2<I3.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure generally relates to a common-mode noise filter, and more particularly to a common-mode noise filter including three coils.

Background Art

[0002] The common-mode noise filter described in Patent Document 1 includes a plurality of non-magnetic layers laminated in a lamination direction, and first, second, and third coils formed in the plurality of non-magnetic layers and independent of each other. The first, second, and third coils each have first, second, and third coil conductors. The first and third coil conductors are arranged so as to be displaced in a direction orthogonal to the lamination direction with respect to the second coil conductor.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the common-mode noise filter described in Patent Document 1, the balance of signals taken out from each coil may be lost, and the mode conversion characteristics may deteriorate.

[0005] An object of the present disclosure is to reduce the possibility of deterioration of the mode conversion characteristics of a common-mode noise filter.

Means for Solving the Problems

[0006] The common mode noise filter according to one aspect of the present disclosure includes a plurality of insulator layers stacked in the vertical direction, and a first coil conductor, a second coil conductor, a third coil conductor, a fourth coil conductor, a fifth coil conductor, and a sixth coil conductor formed on the plurality of insulator layers. The first coil, the second coil, and the third coil are constituted by the first coil conductor, the second coil conductor, the third coil conductor, the fourth coil conductor, the fifth coil conductor, and the sixth coil conductor. The first coil is configured by electrically connecting one of the first coil conductor and the second coil conductor and the fourth coil conductor. The second coil is configured by electrically connecting the remaining one of the first coil conductor and the second coil conductor and one of the fifth coil conductor and the sixth coil conductor. The third coil is configured by electrically connecting the third coil conductor and the remaining one of the fifth coil conductor and the sixth coil conductor. From top to bottom, the first coil conductor, the second coil conductor, the third coil conductor, the fourth coil conductor, the fifth coil conductor, and the sixth coil conductor are arranged in this order. A first interval I1 in the vertical direction from the upper surface of the first coil conductor to the lower surface of the third coil conductor, a second interval I2 in the vertical direction from the upper surface of the fourth coil conductor to the lower surface of the sixth coil conductor, and a third interval I3 in the vertical direction from the lower surface of the third coil conductor to the upper surface of the fourth coil conductor satisfy I1 < I3 and I2 < I3.

Effect of the Invention

[0007] The present disclosure has an advantage that it can reduce the possibility of deterioration of the mode conversion characteristics of the common mode noise filter.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

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Figure 7

Figure 8

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Figure 11

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Figure 13

Embodiments for Carrying Out the Invention

[0009] (Embodiment) Hereinafter, the common mode noise filter according to the embodiment will be described with reference to the drawings. However, the following embodiment is only one of various embodiments of the present disclosure. The following embodiment can be variously modified according to design and the like as long as the object of the present disclosure can be achieved. Also, each drawing described in the following embodiment is a schematic diagram, and the ratio of the size and thickness of each component in the drawing does not necessarily reflect the actual dimensional ratio.

[0010] (Overview) The present disclosure relates to a common mode noise filter. The common mode noise filter allows the differential mode components of a signal to pass through while attenuating the common mode noise components. The common mode noise filter is mounted on a circuit board or electronic components of an electronic device.

[0011] As shown in FIGS. 1 and 2, the common mode noise filter 1 of the present embodiment includes three coils (a first coil L1, a second coil L2, and a third coil L3), three first terminals 4, and three second terminals 5. A corresponding first terminal 4 is connected to the first end of each coil, and a corresponding second terminal 5 is connected to the second end. When the three first terminals 4 are used as signal input terminals, the three second terminals 5 are used as signal output terminals. When the three second terminals 5 are used as signal input terminals, the three first terminals 4 are used as signal output terminals.

[0012] The common mode noise filter 1 is compatible with the mipi C-PHY standard. The common mode noise filter 1 is mounted on a transmission line for transmitting differential signals, and the transmission line has three input lines and three output lines. The three input lines are electrically connected to the three input terminals of the common mode noise filter 1, and the three output lines are electrically connected to the three output terminals of the common mode noise filter 1. The signal input to each input terminal passes through the corresponding coil and is output from the corresponding output terminal.

[0013] In the three output line-side circuits, differential signals between each of the three output lines are taken. That is, three differential signals are obtained. Floating capacitances occur in each of the three coils of the common mode noise filter 1. The variation in the floating capacitance for each coil appears as noise in each of the three differential signals, and the mode conversion characteristics of the common mode noise filter 1 will deteriorate. The present disclosure aims to suppress the variation in the floating capacitance for each coil and reduce the possibility of deterioration of the mode conversion characteristics. In the present embodiment, the mode conversion characteristics are evaluated by referring to the differential / common mode conversion characteristics (Scd21) and the common mode attenuation amount (Scc21). Note that it is also possible to evaluate the mode conversion characteristics by referring to the common / differential mode conversion characteristics (Sdc21).

[0014] In order to reduce the possibility of deterioration of the mode conversion characteristics, as shown in FIG. 1, the common mode noise filter 1 of the present embodiment includes a plurality of insulator layers 20 laminated in the vertical direction, and a first coil conductor 31, a second coil conductor 32, a third coil conductor 33, a fourth coil conductor 34, a fifth coil conductor 35, and a sixth coil conductor 36 formed on the plurality of insulator layers 20. The first coil conductor 31, the second coil conductor 32, the third coil conductor 33, the fourth coil conductor 34, the fifth coil conductor 35, and the sixth coil conductor 36 constitute a first coil L1, a second coil L2, and a third coil L3. The first coil L1 is configured by electrically connecting one of the first coil conductor 31 and the second coil conductor 32 and the fourth coil conductor 34. The second coil L2 is configured by electrically connecting the remaining one of the first coil conductor 31 and the second coil conductor 32 and one of the fifth coil conductor 35 and the sixth coil conductor 36. The third coil L3 is configured by electrically connecting the third coil conductor 33 and the remaining one of the fifth coil conductor 35 and the sixth coil conductor 36. From top to bottom, the first coil conductor 31, the second coil conductor 32, the third coil conductor 33, the fourth coil conductor 34, the fifth coil conductor 35, and the sixth coil conductor 36 are arranged in this order. A first vertical interval I1 from the upper surface 311 of the first coil conductor 31 to the lower surface 332 of the third coil conductor 33, a second vertical interval I2 from the upper surface 341 of the fourth coil conductor 34 to the lower surface 362 of the sixth coil conductor 36, and a third vertical interval I3 from the lower surface 332 of the third coil conductor 33 to the upper surface 341 of the fourth coil conductor 34 satisfy I1 < I3 and I2 < I3.

[0015] The parasitic capacitance between the two coils can cause deterioration of the differential signal of the two coils. According to this embodiment, since the third vertical interval I3 between the third coil conductor 33 and the fourth coil conductor 34 is large, the parasitic capacitance between the third coil conductor 33 and the fourth coil conductor 34 is small. Therefore, it is possible to suppress the differential signal between the output signal of the coil including the third coil conductor 33 and the output signal of the coil including the fourth coil conductor 34 from deteriorating significantly compared to other differential signals. That is, according to this embodiment, it is possible to reduce the possibility that the mode conversion characteristics of the common mode noise filter 1 deteriorate.

[0016] Specifically, in the present embodiment, the first coil L1 includes a first coil conductor 31 and a fourth coil conductor 34 electrically connected to the first coil conductor 31. The second coil L2 includes a second coil conductor 32 and a fifth coil conductor 35 electrically connected to the second coil conductor 32. The third coil L3 includes a third coil conductor 33 and a sixth coil conductor 36 electrically connected to the third coil conductor 33. In this configuration, if the first coil conductor 31, the second coil conductor 32, the third coil conductor 33, the fourth coil conductor 34, the fifth coil conductor 35, and the sixth coil conductor 36 are arranged at equal intervals in the vertical direction, the stray capacitance between the third coil conductor 33 and the fourth coil conductor 34 increases as compared with FIG. 1. That is, the stray capacitance between the first coil L1 and the third coil L3 is larger than the stray capacitance between the first coil L1 and the second coil L2 and the stray capacitance between the second coil L2 and the third coil L3. Then, the (third) differential signal between the output signal of the first coil L1 and the output signal of the third coil L3 is more likely to deteriorate as compared with the (first) differential signal between the output signal of the second coil L2 and the output signal of the first coil L1 and the (second) differential signal between the output signal of the second coil L2 and the output signal of the third coil L3. In particular, in the high-frequency region, since the influence of the stray capacitance becomes large, the third differential signal is likely to deteriorate. If the degree of deterioration of the third differential signal is large compared to the first differential signal and the second differential signal, the balance of the first to third differential signals is lost, and thus the mode conversion characteristics of the common-mode noise filter 1 deteriorate. In the present embodiment, by sufficiently increasing the third interval I3 in the vertical direction from the lower surface 332 of the third coil conductor 33 to the upper surface 341 of the fourth coil conductor 34, the stray capacitance can be reduced, and the possibility of deterioration of the mode conversion characteristics of the common-mode noise filter 1 can be reduced.

[0017] Note that the "upper" and "lower" referred to in the present disclosure merely represent the relative positional relationship of each component of the common-mode noise filter 1, and are not intended to limit the usage direction of the common-mode noise filter 1. For example, the common-mode noise filter 1 may be used in a direction in which the "lower" referred to in the present disclosure is upward, forward, backward, left, or right.

[0018] Hereinafter, each of the first coil conductor 31, the second coil conductor 32, the third coil conductor 33, the fourth coil conductor 34, the fifth coil conductor 35, and the sixth coil conductor 36 may be simply referred to as a "coil conductor".

[0019] (Details) (1) Components As shown in FIGS. 1 to 3, the common mode noise filter 1 of the present embodiment includes a laminate 2, a (single) first coil L1, a (single) second coil L2, a (single) third coil L3, three first terminals 4, and three second terminals 5. The laminate 2 is integrally formed with the first coil L1, the second coil L2, the third coil L3, the three first terminals 4, and the three second terminals 5.

[0020] (2) Laminate As shown in FIG. 1, the laminate 2 includes a plurality (11 in FIG. 1) of insulator layers 20. The plurality of insulator layers 20 are laminated in the vertical direction. When viewed from above, the plurality of insulator layers 20 have the same shape as each other. When viewed from above, the shape of each insulator layer 20 is rectangular. The shape of each insulator layer 20 is a rectangular parallelepiped shape. The plurality of insulator layers 20 overlap, and the laminate 2 is formed in a rectangular parallelepiped shape as a whole.

[0021] The plurality of insulator layers 20 include insulator layers 21, 22, 23, 24, 25, 26, 27, 2a, 2b, 2c, 2d. The plurality of insulator layers 20 overlap in the order of 2a, 2b, 21, 22, 23, 24, 25, 26, 27, 2c, 2d from top to bottom. Note that adjacent insulator layers 20 may be integrated to such an extent that the boundary between the layers is not visible.

[0022] Excluding the insulator layer 24, the thicknesses of each of the plurality of insulator layers 20 are equal to each other. The thickness of the insulator layer 24 is larger than the thicknesses of the other insulator layers 20. The thickness of the insulator layer 24 is larger than twice and smaller than five times the thicknesses of the other insulator layers 20.

[0023] The insulator layers 21 to 27 are non-magnetic layers. The non-magnetic layer includes, for example, glass ceramic as a material.

[0024] The insulating layers 2a to 2d are magnetic layers. The magnetic layer contains, for example, ferrite as a material.

[0025] (3) Three first terminals and three second terminals As shown in FIG. 2, the three first terminals 4 and the three second terminals 5 are formed on the side surface (the surface along the vertical direction) of the laminate 2. Among the laminate 2, the surface on which the three first terminals 4 are formed is the surface opposite to the surface on which the three second terminals 5 are formed.

[0026] The three first terminals 4 and the three second terminals 5 are made of a conductive material such as silver.

[0027] The three first terminals 4 correspond one-to-one with the first coil conductor 31, the second coil conductor 32, and the third coil conductor 33. The three second terminals 5 correspond one-to-one with the fourth coil conductor 34, the fifth coil conductor 35, and the sixth coil conductor 36. Each of the three first terminals 4 and the three second terminals 5 is connected to the first end of the corresponding coil conductor. Thereby, each of the three first terminals 4 and the three second terminals 5 is electrically connected to the corresponding coil conductor.

[0028] Hereinafter, the three first terminals 4 may be distinguished and referred to as first terminals 41, 42, and 43, respectively. The first terminal 41 is electrically connected to the first coil conductor 31. The first terminal 42 is electrically connected to the second coil conductor 32. The first terminal 43 is electrically connected to the third coil conductor 33.

[0029] Hereinafter, the three second terminals 5 may be distinguished and referred to as second terminals 54, 55, and 56, respectively. The second terminal 54 is electrically connected to the fourth coil conductor 34. The second terminal 55 is electrically connected to the fifth coil conductor 35. The second terminal 56 is electrically connected to the sixth coil conductor 36.

[0030] (4) Three coils (4.1) Components The first coil L1, the second coil L2, and the third coil L3 are magnetically coupled to each other.

[0031] As described above, the first coil L1 has the first coil conductor 31 and the fourth coil conductor 34. The second coil L2 has the second coil conductor 32 and the fifth coil conductor 35. The third coil L3 has the third coil conductor 33 and the sixth coil conductor 36.

[0032] Also, as shown in FIGS. 3 and 4, the first coil L1 further has pad conductors 71, 74, and through-hole conductor 61. The second coil L2 further has pad conductors 72, 75, and through-hole conductor 62. The third coil L3 further has pad conductors 73, 76, and through-hole conductor 63.

[0033] (4.2) Three through-hole conductors Each of the three through-hole conductors 61, 62, 63 is disposed across two or more of the plurality of insulator layers 20. When viewed from above, the through-hole conductors 61, 62, 63 are arranged in one direction. When viewed from above, the through-hole conductor 62 is disposed between the through-hole conductor 61 and the through-hole conductor 63.

[0034] Each through-hole conductor 61, 62, 63 is connected to a pad conductor 71 (, 72, 73, 74, 75, or 76) provided at the second end of each of the corresponding two coil conductors. Thereby, each through-hole conductor 61, 62, 63 electrically connects the corresponding two coil conductors. The second end is the end on the side opposite to the first end that is connected to the first terminal 4 or the second terminal 5 among the coil conductors.

[0035] The through-hole conductor 61 electrically connects the two coil conductors of the first coil L1. That is, the through-hole conductor 61 electrically connects the first coil conductor 31 and the fourth coil conductor 34. The through-hole conductor 61 penetrates the insulator layers 22 to 24.

[0036] The through-hole conductor 62 electrically connects the two coil conductors of the second coil L2. That is, the through-hole conductor 62 electrically connects the second coil conductor 32 and the fifth coil conductor 35. The through-hole conductor 62 penetrates the insulator layers 23 to 25.

[0037] The through-hole conductor 63 electrically connects the two coil conductors of the third coil L3. That is, the through-hole conductor 63 electrically connects the third coil conductor 33 and the sixth coil conductor 36. The through-hole conductor 63 penetrates the insulator layers 24 to 26.

[0038] Three through-holes for arranging the three through-hole conductors 61, 62, and 63 are formed in the laminate 2. Each through-hole penetrates at least a part of the plurality of insulator layers 20. By sintering the conductive paste filled in each through-hole, the through-hole conductors 61, 62, and 63 are formed.

[0039] (4.3) Pad Conductor The pad conductors 71 to 76 respectively correspond to the first coil conductor 31, the second coil conductor 32, the third coil conductor 33, the fourth coil conductor 34, the fifth coil conductor 35, and the sixth coil conductor 36. Each of the pad conductors 71 to 76 is provided at the second end of the corresponding coil conductor. The pad conductors 71 and 74 are arranged vertically. The pad conductors 72 and 75 are arranged vertically. The pad conductors 73 and 76 are arranged vertically.

[0040] (4.4) Coil Conductor The coil conductor is made of a conductive material such as silver. The coil conductor is formed in a plate shape. The thickness axis of the coil conductor is along the vertical direction. Also, the normal directions of the upper and lower surfaces of the coil conductor are along the vertical direction. The coil conductor is formed in a spiral shape around a central axis (virtual axis) along the vertical direction. When viewed from above, the directions of the spirals (winding directions) of the first coil conductor 31, the second coil conductor 32, and the third coil conductor 33 are opposite to the directions of the spirals of the fourth coil conductor 34, the fifth coil conductor 35, and the sixth coil conductor 36. For example, in FIG. 3, the directions of the spirals of the first coil conductor 31, the second coil conductor 32, and the third coil conductor 33 are in the clockwise direction of winding the spiral from the outside to the inside of the spiral. The directions of the spirals of the fourth coil conductor 34, the fifth coil conductor 35, and the sixth coil conductor 36 are in the counterclockwise direction of winding the spiral from the outside to the inside of the spiral.

[0041] The number of turns of each coil conductor is greater than 2 turns and generally 3 turns or less. For the N - th turn portion of the coil conductor, the (N + 1) - th turn portion is provided separately. Here, N is an arbitrary value within the range that satisfies the conditions that N is 1 or more and N + 1 is less than or equal to the number of turns of the coil conductor. For example, when focusing on the third coil conductor 33, N = 1, 2.

[0042] Each coil conductor is formed, for example, by plating transfer on the surface of the corresponding insulator layer 20. Each coil conductor is provided so as to be embedded in the insulator layer 20. The first coil conductor 31 is formed between the insulator layers 21 and 22. The second coil conductor 32 is formed between the insulator layers 22 and 23. The third coil conductor 33 is formed between the insulator layers 23 and 24. The fourth coil conductor 34 is formed between the insulator layers 24 and 25. The fifth coil conductor 35 is formed between the insulator layers 25 and 26. The sixth coil conductor 36 is formed between the insulator layers 26 and 27.

[0043] The thickness T1 of each coil conductor (see FIG. 1) is smaller than the thickness of each insulator layer 20. Also, the width W1 of each coil conductor (see FIG. 1) is smaller than the thickness of each insulator layer 20. The width W1 is the width of the linear conductor when the coil conductor is regarded as a single linear conductor.

[0044] Also, when viewed from above, the distance E1 between the first coil conductor 31 and the second coil conductor 32 is larger than the width W1.

[0045] The six coil conductors correspond one-to-one with the six pad conductors 71 to 76. The second end of each coil conductor is electrically connected to the corresponding pad conductor. And two pad conductors arranged in the vertical direction are electrically connected via the through-hole conductors 61, 62 or 63. Thereby, in each of the first coil L1, the second coil L2, and the third coil L3, two coil conductors are electrically connected.

[0046] The shape of the coil conductor when viewed from above is a shape in which a plurality of line segments are smoothly connected via arcs. As shown in FIG. 4, the first turn of the third coil conductor 33 includes linear portions 33a, 33b, 33c, 33d, 33e, the second turn includes linear portions 33f, 33g, 33h, 33i, and the third turn includes linear portions 33j, 33k, 33l, 33m. They are connected in the order of 33a to 33m from the outside to the inside of the vortex. The shapes of the portions 33a, 33c, 33e, 33g, 33i, 33k, 33m are linear along the left-right direction. The shapes of the portions 33b, 33d, 33f, 33h, 33j, 33l are linear along the front-back direction. As shown in FIG. 3, the coil conductors other than the third coil conductor 33 also have substantially the same configuration as the third coil conductor 33.

[0047] (5) Positional relationship of a plurality of coil conductors As described above, the first vertical interval I1 from the upper surface 311 of the first coil conductor 31 to the lower surface 332 of the third coil conductor 33, the second vertical interval I2 from the upper surface 341 of the fourth coil conductor 34 to the lower surface 362 of the sixth coil conductor 36, and the third vertical interval I3 from the lower surface 332 of the third coil conductor 33 to the upper surface 341 of the fourth coil conductor 34 satisfy I1 < I3 and I2 < I3. Also, I3 ≤ I1 + I2 is satisfied. The magnitudes of I1, I2, and I3 are adjusted according to the thickness of each insulator layer 20.

[0048] As shown in FIG. 1, in a predetermined cross-section (the cross-section of FIG. 1) parallel to the vertical direction, the distance A1 and the distance B1 satisfy A1 < B1. The distance A1 is the distance from the Nth turn portion of the second coil conductor 32 to the Nth turn portion of the first coil conductor 31. More specifically, the distance A1 is the distance from the outer circumference of the Nth turn portion of the second coil conductor 32 to the inner circumference of the Nth turn portion of the first coil conductor 31. The distance B1 is the distance B1 from the Nth turn portion of the second coil conductor 32 to the (N + 1)th turn portion of the first coil conductor 31. More specifically, the distance B1 is the distance from the inner circumference of the Nth turn portion of the second coil conductor 32 to the outer circumference of the (N + 1)th turn portion of the first coil conductor 31. However, N is an arbitrary value within the range that satisfies the conditions that N is 1 or more and N + 1 is less than or equal to the number of turns of the first coil conductor 31. Here, N = 1, 2. In FIG. 1, only the first turn portion and the second turn portion of each coil conductor are shown, but the positional relationship between the second turn portion and the third turn portion is the same as the positional relationship between the first turn portion and the second turn portion.

[0049] Also, in a predetermined cross-section (the cross-section of FIG. 1) parallel to the vertical direction, the distance A2 and the distance B2 satisfy A2 < B2. The distance A2 is the distance from the portion of the N-th turn of the second coil conductor 32 to the portion of the N-th turn of the third coil conductor 33. More specifically, the distance A2 is the distance from the outer circumference of the portion of the N-th turn of the second coil conductor 32 to the inner circumference of the portion of the N-th turn of the third coil conductor 33. The distance B2 is the distance from the portion of the N-th turn of the second coil conductor 32 to the portion of the (N + 1)-th turn of the third coil conductor 33. More specifically, the distance B2 is the distance from the inner circumference of the portion of the N-th turn of the second coil conductor 32 to the outer circumference of the portion of the (N + 1)-th turn of the third coil conductor 33. However, N is an arbitrary value within the range that satisfies the conditions of N ≥ 1 and N + 1 ≤ the number of turns of the third coil conductor 33. Here, N = 1, 2.

[0050] Also, in a predetermined cross-section (the cross-section of FIG. 1) parallel to the vertical direction, the distance C1 and the distance D1 satisfy C1 < D1. The distance C1 is the distance from the portion of the N-th turn of the fifth coil conductor 35 to the portion of the N-th turn of the fourth coil conductor 34. More specifically, the distance C1 is the distance from the outer circumference of the portion of the N-th turn of the fifth coil conductor 35 to the inner circumference of the portion of the N-th turn of the fourth coil conductor 34. The distance D1 is the distance from the portion of the N-th turn of the fifth coil conductor 35 to the portion of the (N + 1)-th turn of the fourth coil conductor 34. More specifically, the distance D1 is the distance from the inner circumference of the portion of the N-th turn of the fifth coil conductor 35 to the outer circumference of the portion of the (N + 1)-th turn of the fourth coil conductor 34. However, N is an arbitrary value within the range that satisfies the conditions of N ≥ 1 and N + 1 ≤ the number of turns of the fourth coil conductor 34. Here, N = 1, 2.

[0051] Also, in a predetermined cross-section (the cross-section in FIG. 1) parallel to the vertical direction, the distance C2 and the distance D2 satisfy C2 < D2. The distance C2 is the distance from the N-th turn portion of the fifth coil conductor 35 to the N-th turn portion of the sixth coil conductor 36. More specifically, the distance C2 is the distance from the outer circumference of the N-th turn portion of the fifth coil conductor 35 to the inner circumference of the N-th turn portion of the sixth coil conductor 36. The distance D2 is the distance from the N-th turn portion of the fifth coil conductor 35 to the (N + 1)-th turn portion of the sixth coil conductor 36. More specifically, the distance D2 is the distance from the inner circumference of the N-th turn portion of the fifth coil conductor 35 to the outer circumference of the (N + 1)-th turn portion of the sixth coil conductor 36. However, N is an arbitrary value within the range that satisfies the conditions that N is 1 or more and N + 1 is less than or equal to the number of turns of the sixth coil conductor 36. Here, N = 1, 2.

[0052] Due to the relationships A1 < B1, A2 < B2, C1 < D1, and C2 < D2, the common-mode noise filter 1 can enhance its ability to remove common-mode noise respectively.

[0053] Also, FIG. 5 schematically shows the state in which the first coil conductor 31 and the second coil conductor 32 viewed from above are projected onto one plane. FIG. 6 schematically shows the state in which the third coil conductor 33 and the second coil conductor 32 viewed from above are projected onto one plane. When viewed from above, the N-th turn portion of the second coil conductor 32 is provided between the N-th turn portion and the (N + 1)-th turn portion of the first coil conductor 31. Also, when viewed from above, the N-th turn portion of the second coil conductor 32 is provided between the N-th turn portion and the (N + 1)-th turn portion of the third coil conductor 33. Here, N = 1, 2.

[0054] When viewed from above, the second coil conductor 32 is separated from both the first coil conductor 31 and the third coil conductor 33. That is, when viewed from above, a part or all of the second coil conductor 32 does not overlap with either the first coil conductor 31 or the third coil conductor 33. Thereby, the insulation reliability of the first coil conductor 31, the second coil conductor 32, and the third coil conductor 33 can be improved.

[0055] On the one hand, when viewed from above, most of the first coil conductor 31 and the third coil conductor 33 overlap. At least, the first coil conductor 31 and the third coil conductor 33 overlap over one turn or more. Referring to FIGS. 3 and 4, the linear portions 33b to 33l of the third coil conductor 33 overlap the corresponding portions of the first coil conductor 31.

[0056] Also, between the N - th turn portion and the (N + 1) - th turn portion of the fifth coil conductor 35, the N - th turn portion of the fourth coil conductor 34 is provided. Also, between the N - th turn portion and the (N + 1) - th turn portion of the fifth coil conductor 35, the N - th turn portion of the sixth coil conductor 36 is provided. Here, N = 1, 2.

[0057] When viewed from above, the fifth coil conductor 35 is separated from both the fourth coil conductor 34 and the sixth coil conductor 36. That is, when viewed from above, part or all of the fifth coil conductor 35 does not overlap with either the fourth coil conductor 34 or the sixth coil conductor 36. Thereby, the insulation reliability of the fourth coil conductor 34, the fifth coil conductor 35, and the sixth coil conductor 36 can be improved.

[0058] On the one hand, when viewed from above, most of the fourth coil conductor 34 and the sixth coil conductor 36 overlap. At least, the fourth coil conductor 34 and the sixth coil conductor 36 overlap over one turn or more.

[0059] The vertical facing area between the first coil conductor 31 and the third coil conductor 33 is larger than the vertical facing area between the first coil conductor 31 and the second coil conductor 32. The stray capacitance between the first coil conductor 31 and the third coil conductor 33 is larger than the stray capacitance between the first coil conductor 31 and the second coil conductor 32.

[0060] The vertical facing area between the first coil conductor 31 and the third coil conductor 33 is larger than the vertical facing area between the third coil conductor 33 and the second coil conductor 32. The stray capacitance between the first coil conductor 31 and the third coil conductor 33 is larger than the stray capacitance between the third coil conductor 33 and the second coil conductor 32.

[0061] The vertical facing area between the fourth coil conductor 34 and the sixth coil conductor 36 is larger than the vertical facing area between the fourth coil conductor 34 and the fifth coil conductor 35. The stray capacitance between the fourth coil conductor 34 and the sixth coil conductor 36 is larger than the stray capacitance between the fourth coil conductor 34 and the fifth coil conductor 35.

[0062] The vertical facing area between the fourth coil conductor 34 and the sixth coil conductor 36 is larger than the vertical facing area between the sixth coil conductor 36 and the fifth coil conductor 35. The stray capacitance between the fourth coil conductor 34 and the sixth coil conductor 36 is larger than the stray capacitance between the sixth coil conductor 36 and the fifth coil conductor 35.

[0063] The vertical facing area between the third coil conductor 33 and the fourth coil conductor 34 is larger than the vertical facing area between the third coil conductor 33 and the second coil conductor 32.

[0064] (6) Evaluation of mode conversion characteristics (6.1) First evaluation Fig. 7 shows the differential / common mode conversion characteristics (three Scd21) of the common mode noise filter of the first comparative example. Fig. 8 shows the three Scd21 of the common mode noise filter of the first reference example.

[0065] In the common mode noise filters of the first reference example and the first comparative example, similar to the common mode noise filter 1 of the embodiment, the first coil L1 has the first coil conductor 31 and the fourth coil conductor 34, the second coil L2 has the second coil conductor 32 and the fifth coil conductor 35, and the third coil L3 has the third coil conductor 33 and the sixth coil conductor 36.

[0066] Also, the common mode noise filter of the first reference example satisfies the following conditions, while the common mode noise filter of the first comparative example does not satisfy the following conditions.

[0067] I1 < I3, I2 < I3, I3 ≦ I1 + I2 In each of FIGS. 7 and 8, the three Scd21s correspond to the differential signal between the output signal of the first coil L1 and the output signal of the second coil L2, the differential signal between the output signal of the second coil L2 and the output signal of the third coil L3, and the differential signal between the output signal of the third coil L3 and the output signal of the first coil L1. Curve 91 represents one of the three Scd21s, curve 92 represents another one of the three Scd21s, and curve 93 represents the remaining one of the three Scd21s. Similarly, curve 94 represents one of the three Scd21s, curve 95 represents another one of the three Scd21s, and curve 96 represents the remaining one of the three Scd21s.

[0068] It can be said that the smaller Scd21 is over a wide band, the better the mode conversion characteristics are. As shown in FIGS. 7 and 8, in the common mode noise filter of the first reference example, compared with the common mode noise filter of the first comparative example, Scd21 in the vicinity of 1000 to 8000 [MHz] is smaller and the mode conversion characteristics are better. This is because in the common mode noise filter of the first reference example, compared with the common mode noise filter of the first comparative example, by satisfying the above conditions, the variation in the stray capacitance of each coil is suppressed. Therefore, it is considered that the common mode noise filter 1 of the embodiment that satisfies the above conditions as in the first reference example can also obtain the effect of improving the mode conversion characteristics.

[0069] (6.2) Second evaluation In FIG. 9, the common-mode attenuation (Scc21) of the common-mode noise filter of the second comparative example is shown by curve 97, and the Scc21 of the common-mode noise filter of the second reference example is shown by curve 98. In the common-mode noise filter of the second reference example, A1 < B1, A2 < B2, C1 < D1, and D2 < D2 are satisfied. On the other hand, in the common-mode noise filter of the second comparative example, these conditions are not satisfied. Other configurations are common to the second comparative example and the second reference example.

[0070] It can be said that the better the removal performance of the common-mode noise is, the smaller Scc21 is over a wide band. As shown in FIG. 9, in the second reference example, Scc21 is smaller than in the second comparative example. Therefore, the common-mode noise filter 1 of the embodiment that satisfies the above conditions, like the second reference example, can improve the removal performance of the common-mode noise while maintaining the mode conversion characteristics.

[0071] (Modification 1) Hereinafter, the common-mode noise filter 1A according to Modification 1 will be described with reference to FIGS. 10 to 12. For the same configurations as those in the embodiment, the same reference numerals will be given and the description thereof will be omitted.

[0072] (1) Configuration The connection relationship of the plurality of coil conductors of the common-mode noise filter 1A of this Modification 1 is different from that of the common-mode noise filter 1 of the above embodiment. More specifically, the first coil conductor 31 is electrically connected to the fifth coil conductor 35, and the second coil conductor 32 is electrically connected to the fourth coil conductor 34.

[0073] That is, in the common-mode noise filter 1A of this Modification 1, the first coil L1 has the second coil conductor 32 and the fourth coil conductor 34 electrically connected to the second coil conductor 32. The second coil L2 has the first coil conductor 31 and the fifth coil conductor 35 electrically connected to the first coil conductor 31. The third coil L3 has the third coil conductor 33 and the sixth coil conductor 36 electrically connected to the third coil conductor 33.

[0074] In the first modification example, since the connection relationship of the plurality of coil conductors is different from that in the embodiment, the shapes of the fourth coil conductor 34 and the fifth coil conductor 35 of the common mode noise filter 1A (see FIG. 12) are slightly different from those in FIG. 3. Further, along with the change in the shapes of the fourth coil conductor 34 and the fifth coil conductor 35, the arrangement of the three second terminals 5 is different from that in FIG. 2 (see FIG. 11).

[0075] The through-hole conductor 61 electrically connects the second coil conductor 32 and the fourth coil conductor 34. The through-hole conductor 62 electrically connects the first coil conductor 31 and the fifth coil conductor 35. The through-hole conductor 63 electrically connects the third coil conductor 33 and the sixth coil conductor 36.

[0076] In the common mode noise filter 1 of the above embodiment, as shown in FIG. 1, the first coil conductor 31 of the first coil L1 and the third coil conductor 33 of the third coil L3 face each other in the vertical direction. Also, the fourth coil conductor 34 of the first coil L1 and the sixth coil conductor 36 of the third coil L3 face each other in the vertical direction. A parasitic capacitance is generated between the opposing coil conductors. Note that although the third coil conductor 33 and the fourth coil conductor 34 also face each other in the vertical direction, the interval is relatively large and the parasitic capacitance is relatively small, so it is ignored here.

[0077] On the other hand, in the common mode noise filter 1A of the first modification example, as shown in FIG. 10, the first coil conductor 31 of the second coil L2 and the third coil conductor 33 of the third coil L3 face each other in the vertical direction. Also, the fourth coil conductor 34 of the first coil L1 and the sixth coil conductor 36 of the third coil L3 face each other in the vertical direction. A parasitic capacitance is generated between the opposing coil conductors.

[0078] In the above embodiment, there are two locations where the two coil conductors face each other in the vertical direction, and in both cases, the coil conductor of the first coil L1 and the coil conductor of the third coil L3 face each other. Therefore, a parasitic capacitance mainly occurs between the first coil L1 and the third coil L3, and the parasitic capacitances between the first coil L1 and the second coil L2, and between the second coil L2 and the third coil L3 are relatively small. Thus, the degradation of the (third) differential signal between the output signal of the first coil L1 and the output signal of the third coil L3 is significant compared to the first differential signal and the second differential signal. When a part of the differential signal degrades more than others in this way, the balance of the first to third differential signals is disrupted, so the mode conversion characteristics may deteriorate.

[0079] On the other hand, in this Modification 1, there are two locations where the two coil conductors face each other in the vertical direction. One is the location where the coil conductor of the second coil L2 and the coil conductor of the third coil L3 face each other, and the other is the location where the coil conductor of the first coil L1 and the coil conductor of the third coil L3 face each other. That is, the two parasitic capacitances that occurred between the first coil L1 and the third coil L3 in the above embodiment are dispersed into the parasitic capacitance between the second coil L2 and the third coil L3 and the parasitic capacitance between the first coil L1 and the third coil L3 in this Modification 1. By reducing the variation in parasitic capacitance in this way, the balance of the differential signal is improved, and the degradation of the mode conversion characteristics can be suppressed.

[0080] Note that a parasitic capacitance also occurs between two obliquely facing coil conductors, such as between the first coil conductor 31 and the second coil conductor 32, but this parasitic capacitance is smaller than the parasitic capacitance between two vertically facing coil conductors. This is because the facing direction of the two coil conductors is oblique with respect to the normal direction of each coil conductor, so the effective facing area contributing to the parasitic capacitance becomes smaller. Therefore, only the parasitic capacitance between two vertically facing coil conductors is considered in the above description.

[0081] (2) Evaluation of mode conversion characteristics Fig. 13 shows three Scd21s of the common-mode noise filter of the third reference example. In the common-mode noise filter of the third reference example, similar to the common-mode noise filter 1A of the first modification example, the first coil L1 has the second coil conductor 32 and the fourth coil conductor 34, the second coil L2 has the first coil conductor 31 and the fifth coil conductor 35, and the third coil L3 has the third coil conductor 33 and the sixth coil conductor 36 (see Fig. 12).

[0082] Also, the common-mode noise filter of the third reference example satisfies the following conditions.

[0083] I1 < I3, I2 < I3, I3 ≦ I1 + I2 That is, the connection relationships of the respective coil conductors of the common-mode noise filter of the third reference example and the common-mode noise filter of the first reference example (see Figs. 3 and 8) are different. Therefore, in the common-mode noise filter of the third reference example (see Fig. 12), the shapes of the fourth coil conductor 34 and the fifth coil conductor 35 are slightly different from those in Fig. 3. Also, along with the change in the shapes of the fourth coil conductor 34 and the fifth coil conductor 35, the arrangement of the three second terminals 5 is different from that in Fig. 2 (see Fig. 11). Other configurations of the common-mode noise filter of the third reference example are the same as those of the common-mode noise filter of the first reference example.

[0084] Curves 101 to 103 in Fig. 13 show Scd21 corresponding to each differential signal, similar to curves 94 to 96 in Fig. 8. As shown in Fig. 13, in the common-mode noise filter of the third reference example, compared with the common-mode noise filter of the first reference example (see Fig. 8), Scd21 in the vicinity of 1000 to 8000 [MHz] is small and the mode conversion characteristics are good. Therefore, it is considered that the common-mode noise filter 1A of the first modification example that satisfies the above conditions as in the third reference example has better mode conversion characteristics than the common-mode noise filter 1 of the embodiment.

[0085] (Other modification examples of the embodiment) The following are other modifications of the embodiments. The following modifications may be implemented in appropriate combinations. Further, the following modifications may be implemented in combination with any of the above-described embodiments and Modification 1.

[0086] There may be two or more insulator layers 24 between the third coil conductor 33 and the fourth coil conductor 34.

[0087] The number of turns of the coil conductor is not limited to the number of turns described above.

[0088] The three first terminals 4 and the three second terminals 5 may be part of the coil conductor.

[0089] In the binary comparison in the present disclosure, the phrase "or more" includes both cases where the two values are equal and cases where one of the two values exceeds the other. However, it is not limited to this, and the "or more" here may be synonymous with "greater than", which includes only the case where one of the two values exceeds the other. That is, whether or not to include the case where the two values are equal can be arbitrarily changed depending on the setting of a reference value or the like, and there is no technical difference between "or more" and "greater than". Similarly, "or less" may be synonymous with "less than".

[0090] The "equal" referred to in the present disclosure is not limited to a completely equal state, and also includes cases where there are differences within a practically acceptable range. For example, if the difference between two values is within a range of less than 5%, they may be regarded as "equal" and the present disclosure may be applied.

[0091] (Summary) From the embodiments and the like described above, the following aspects are disclosed.

[0092] The common mode noise filter (1, 1A) according to the first aspect includes a plurality of insulator layers (20) laminated in the vertical direction, and a first coil conductor (31), a second coil conductor (32), a third coil conductor (33), a fourth coil conductor (34), a fifth coil conductor (35), and a sixth coil conductor (36) formed in the plurality of insulator layers (20). The first coil (L1), the second coil (L2), and the third coil (L3) are constituted by the first coil conductor (31), the second coil conductor (32), the third coil conductor (33), the fourth coil conductor (34), the fifth coil conductor (35), and the sixth coil conductor (36). The first coil (L1) is configured by electrically connecting one of the first coil conductor (31) and the second coil conductor (32) and the fourth coil conductor (34). The second coil (L2) is configured by electrically connecting the remaining one of the first coil conductor (31) and the second coil conductor (32) and one of the fifth coil conductor (35) and the sixth coil conductor (36). The third coil (L3) is configured by electrically connecting the third coil conductor (33) and the remaining one of the fifth coil conductor (35) and the sixth coil conductor (36). From top to bottom, the first coil conductor (31), the second coil conductor (32), the third coil conductor (33), the fourth coil conductor (34), the fifth coil conductor (35), and the sixth coil conductor (36) are arranged in this order. A first vertical interval (I1) from the upper surface (311) of the first coil conductor (31) to the lower surface (332) of the third coil conductor (33), a second vertical interval (I2) from the upper surface (341) of the fourth coil conductor (34) to the lower surface (362) of the sixth coil conductor (36), and a third vertical interval (I3) from the lower surface (332) of the third coil conductor (33) to the upper surface (341) of the fourth coil conductor (34) satisfy I1 < I3 and I2 < I3.

[0093] According to the above configuration, it is possible to reduce the possibility of deterioration of the mode conversion characteristics of the common mode noise filter (1, 1A).

[0094] Further, in the common mode noise filter (1, 1A) according to the second aspect, in the first aspect, I3 ≦ I1 + I2 is satisfied.

[0095] According to the above configuration, at least one of the stray capacitances between the first coil conductor (31) and the third coil conductor (33) and between the fourth coil conductor (34) and the sixth coil conductor (36) can be reduced. Therefore, the possibility of deterioration of the mode conversion characteristics of the common mode noise filter (1, 1A) can be further reduced.

[0096] Also, in the common mode noise filter (1) according to the third aspect, in the first or second aspect, the first coil (L1) has the first coil conductor (31) and the fourth coil conductor (34). The fourth coil conductor (34) is electrically connected to the first coil conductor (31). The second coil (L2) has the second coil conductor (32) and the fifth coil conductor (35). The fifth coil conductor (35) is electrically connected to the second coil conductor (32). The third coil (L3) has the third coil conductor (33) and the sixth coil conductor (36). The sixth coil conductor (36) is electrically connected to the third coil conductor (33).

[0097] According to the above configuration, the possibility of deterioration of the mode conversion characteristics of the common mode noise filter (1) can be reduced.

[0098] Also, in the common mode noise filter (1A) according to the fourth aspect, in the first or second aspect, the first coil (L1) has the second coil conductor (32) and the fourth coil conductor (34). The fourth coil conductor (34) is electrically connected to the second coil conductor (32). The second coil (L2) has the first coil conductor (31) and the fifth coil conductor (35). The fifth coil conductor (35) is electrically connected to the first coil conductor (31). The third coil (L3) has the third coil conductor (33) and the sixth coil conductor (36). The sixth coil conductor (36) is electrically connected to the third coil conductor (33).

[0099] According to the above configuration, the variation in the floating capacitance can be reduced, thereby further reducing the possibility of deterioration of the mode conversion characteristics of the common mode noise filter (1A).

[0100] Also, in the common mode noise filter (1, 1A) according to the fifth aspect, in any one of the first to fourth aspects, in a predetermined cross section parallel to the vertical direction, from the portion of the Nth turn of the second coil conductor (32) to the portion of the Nth turn of the first coil conductor (31), the distance (A1) and the distance (B1) from the portion of the Nth turn of the second coil conductor (32) to the portion of the (N + 1)th turn of the first coil conductor (31) satisfy A1 < B1. However, N is an arbitrary value within the range satisfying the conditions that N is 1 or more and N + 1 is less than or equal to the number of turns of the first coil conductor (31).

[0101] According to the above configuration, while maintaining the mode conversion characteristics of the common mode noise filter (1, 1A), the removal performance of the common mode noise can be enhanced.

[0102] Also, in the common mode noise filter (1, 1A) according to the sixth aspect, in any one of the first to fifth aspects, in a predetermined cross section parallel to the vertical direction, from the portion of the Nth turn of the second coil conductor (32) to the portion of the Nth turn of the third coil conductor (33), the distance (A2) and the distance (B2) from the portion of the Nth turn of the second coil conductor (32) to the portion of the (N + 1)th turn of the third coil conductor (33) satisfy A2 < B2. However, N is an arbitrary value within the range satisfying the conditions that N is 1 or more and N + 1 is less than or equal to the number of turns of the third coil conductor (33).

[0103] According to the above configuration, while maintaining the mode conversion characteristics of the common mode noise filter (1, 1A), the removal performance of the common mode noise can be enhanced.

[0104] Also, in the common-mode noise filter (1, 1A) according to the seventh aspect, in any one of the first to sixth aspects, in a predetermined cross-section parallel to the vertical direction, from the portion of the Nth turn of the fifth coil conductor (35) to the portion of the Nth turn of the fourth coil conductor (34), the distance (C1) and the distance (D1) from the portion of the Nth turn of the fifth coil conductor (35) to the portion of the (N + 1)th turn of the fourth coil conductor (34) satisfy C1 < D1. However, N is any value within the range that satisfies the conditions that N is 1 or more and N + 1 is less than or equal to the number of turns of the fourth coil conductor (34).

[0105] According to the above configuration, while maintaining the mode conversion characteristics of the common-mode noise filter (1, 1A), the removal performance of the common-mode noise can be improved.

[0106] Also, in the common-mode noise filter (1, 1A) according to the eighth aspect, in any one of the first to seventh aspects, in a predetermined cross-section parallel to the vertical direction, from the portion of the Nth turn of the fifth coil conductor (35) to the portion of the Nth turn of the sixth coil conductor (36), the distance (C2) and the distance (D2) from the portion of the Nth turn of the fifth coil conductor (35) to the portion of the (N + 1)th turn of the sixth coil conductor (36) satisfy C2 < D2. However, N is any value within the range that satisfies the conditions that N is 1 or more and N + 1 is less than or equal to the number of turns of the sixth coil conductor (36).

[0107] According to the above configuration, while maintaining the mode conversion characteristics of the common-mode noise filter (1, 1A), the removal performance of the common-mode noise can be improved.

[0108] Also, in the common-mode noise filter (1, 1A) according to the ninth aspect, in any one of the first to eighth aspects, when viewed from above, the second coil conductor (32) is separated from both the first coil conductor (31) and the third coil conductor (33).

[0109] According to the above configuration, the insulation reliability of the coil conductor can be improved.

[0110] Also, in the common mode noise filter (1, 1A) according to the tenth aspect, in any one of the first to ninth aspects, when viewed from above, the fifth coil conductor (35) is separated from both the fourth coil conductor (34) and the sixth coil conductor (36).

[0111] According to the above configuration, the insulation reliability of the coil conductor can be improved.

[0112] Regarding the configurations other than the first aspect, they are not essential configurations for the common mode noise filter (1, 1A) and can be appropriately omitted.

Explanation of Signs

[0113] 1, 1A Common mode noise filter 20 Insulator layer 31 First coil conductor 32 Second coil conductor 33 Third coil conductor 34 Fourth coil conductor 35 Fifth coil conductor 36 Sixth coil conductor 311 Upper surface 332 Lower surface 341 Upper surface 362 Lower surface A1 Distance A2 Distance B1 Distance B2 Distance C1 Distance C2 Distance D1 Distance D2 Distance I1 First interval I2 Second interval I3 Third interval L1 First coil L2 Second coil L3 Third coil

Claims

1. A plurality of insulator layers laminated in the vertical direction, a first coil conductor, a second coil conductor, a third coil conductor, a fourth coil conductor, a fifth coil conductor, and a sixth coil conductor formed on the plurality of insulator layers, a first coil, a second coil, and a third coil are constituted by the first coil conductor, the second coil conductor, the third coil conductor, the fourth coil conductor, the fifth coil conductor, and the sixth coil conductor, the first coil is configured by electrically connecting one of the first coil conductor and the second coil conductor and the fourth coil conductor, the second coil is configured by electrically connecting the remaining one of the first coil conductor and the second coil conductor and one of the fifth coil conductor and the sixth coil conductor, the third coil is configured by electrically connecting the third coil conductor and the remaining one of the fifth coil conductor and the sixth coil conductor, the first coil conductor, the second coil conductor, the third coil conductor, the fourth coil conductor, the fifth coil conductor, and the sixth coil conductor are arranged in this order from top to bottom, a first interval I1 in the vertical direction from the upper surface of the first coil conductor to the lower surface of the third coil conductor, a second interval I2 in the vertical direction from the upper surface of the fourth coil conductor to the lower surface of the sixth coil conductor, and a third interval I3 in the vertical direction from the lower surface of the third coil conductor to the upper surface of the fourth coil conductor, satisfying I1 < I3 and I2 < I3, A common mode noise filter.

2. satisfying I3 ≤ I1 + I2, The common mode noise filter according to Claim 1.

3. the first coil has the first coil conductor and the fourth coil conductor electrically connected to the first coil conductor, The second coil has the second coil conductor and the fifth coil conductor electrically connected to the second coil conductor. The third coil has the third coil conductor and the sixth coil conductor electrically connected to the third coil conductor. The common mode noise filter according to claim 1 or 2.

4. The first coil has the second coil conductor and the fourth coil conductor electrically connected to the second coil conductor. The second coil has the first coil conductor and the fifth coil conductor electrically connected to the first coil conductor. The third coil has the third coil conductor and the sixth coil conductor electrically connected to the third coil conductor. The common mode noise filter according to claim 1 or 2.

5. In a predetermined cross-section parallel to the vertical direction, The distance A1 from the Nth turn portion of the second coil conductor to the Nth turn portion of the first coil conductor, and The distance B1 from the Nth turn portion of the second coil conductor to the (N + 1)th turn portion of the first coil conductor satisfy A1 < B1, However, N is any value within the range that satisfies the condition that N is 1 or more and N + 1 is less than or equal to the number of turns of the first coil conductor. The common mode noise filter according to any one of claims 1 to 4.

6. In a predetermined cross-section parallel to the vertical direction, The distance A2 from the Nth turn portion of the second coil conductor to the Nth turn portion of the third coil conductor, and The distance B2 from the Nth turn portion of the second coil conductor to the (N + 1)th turn portion of the third coil conductor satisfy A2 < B2, However, N is an arbitrary value within the range that satisfies the condition that N is 1 or more and N + 1 is less than or equal to the number of turns of the third coil conductor. The common mode noise filter according to any one of claims 1 to 5.

7. In a predetermined cross-section parallel to the vertical direction, The distance C1 from the portion of the Nth turn of the fifth coil conductor to the portion of the Nth turn of the fourth coil conductor, and The distance D1 from the portion of the Nth turn of the fifth coil conductor to the portion of the (N + 1)th turn of the fourth coil conductor are such that C1 < D1 is satisfied. However, N is an arbitrary value within the range that satisfies the condition that N is 1 or more and N + 1 is less than or equal to the number of turns of the fourth coil conductor. The common mode noise filter according to any one of claims 1 to 6.

8. In a predetermined cross-section parallel to the vertical direction, The distance C2 from the portion of the Nth turn of the fifth coil conductor to the portion of the Nth turn of the sixth coil conductor, and The distance D2 from the portion of the Nth turn of the fifth coil conductor to the portion of the (N + 1)th turn of the sixth coil conductor are such that C2 < D2 is satisfied. However, N is an arbitrary value within the range that satisfies the condition that N is 1 or more and N + 1 is less than or equal to the number of turns of the sixth coil conductor. The common mode noise filter according to any one of claims 1 to 7.

9. When viewed from above, the second coil conductor is separated from both the first coil conductor and the third coil conductor. The common mode noise filter according to any one of claims 1 to 8.

10. When viewed from above, the fifth coil conductor is separated from both the fourth coil conductor and the sixth coil conductor. The common mode noise filter according to any one of claims 1 to 9.

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