Common-mode noise filter

Abstract

A common mode noise filter (1) according to an embodiment comprises: a first conductor part (3); a second conductor part (4); a first barrier layer (5) electrically insulated from the first conductor part (3); and a second barrier layer (6) electrically insulated from the second conductor part (4). The first conductor part (3) has a first spiral conductor (31) and a first lead-out conductor (32). The second conductor part (4) has a second spiral conductor (41) and a second lead-out conductor (42). The first barrier layer (5) is provided at a position at which the first lead-out conductor (32) and the outermost periphery (315) of the first spiral conductor (31) overlap when viewed in the vertical direction. The second barrier layer (6) is provided at a position at which the second lead-out conductor (42) and the outermost periphery (415) of the second spiral conductor (41) overlap when viewed in the vertical direction.

Description

Common Mode Noise Filter

[0001] The present disclosure relates generally to a common mode noise filter, and more particularly to a common mode noise filter having multiple conductor portions.

[0002] Patent Document 1 discloses a common mode noise filter including stacked first and second spiral conductors, first and second terminal electrodes, first and second lead conductors, and multiple resin insulation layers. The first lead conductor connects the inner peripheral end of the first spiral conductor to the first terminal electrode. The second lead conductor connects the inner peripheral end of the second spiral conductor to the second terminal electrode. Multiple resin insulation layers are provided between the first and second spiral conductors. The first and second lead conductors are formed on different resin insulation layers from the multiple resin insulation layers.

[0003] JP 2009-33033 A

[0004] In the above-described common-mode noise filter, when a high voltage is applied to the first spiral conductor and the first lead conductor, the following problem may occur: The electric field strength between the outermost periphery of the first spiral conductor and the first lead conductor increases, which may cause cracks or fissures to form between the outermost periphery of the first spiral conductor and the first lead conductor. In other words, the above-described conventional common-mode noise filter may have reduced resistance to high voltages.

[0005] The present disclosure provides a common mode noise filter that can suppress a decrease in resistance to high voltages.

[0006] A common mode noise filter according to one aspect of the present disclosure includes an element body, a first conductor portion, a second conductor portion, a first barrier layer, and a second barrier layer. The first conductor portion and the second conductor portion are provided inside the element body and are aligned in the vertical direction. The first barrier layer is provided inside the element body and is electrically insulated from the first conductor portion. The second barrier layer is provided inside the element body and is electrically insulated from the second conductor portion. The first conductor portion includes a first spiral conductor and a first lead conductor. The first spiral conductor extends in a spiral shape. The first lead conductor is provided on a different plane from the first spiral conductor in the vertical direction, and leads both ends of the first spiral conductor to the outer surface of the element body. The second conductor portion includes a second spiral conductor and a second lead conductor. The second spiral conductor extends in a spiral shape. The second lead conductor is provided on a different plane from the second spiral conductor in the vertical direction, and both ends of the second spiral conductor are led out to the outer surface of the element body. The first barrier layer is provided between the first spiral conductor and the first lead conductor in the vertical direction, at a position where the first lead conductor overlaps with the outermost periphery of the first spiral conductor when viewed from the vertical direction. The second barrier layer is provided between the second spiral conductor and the second lead conductor in the vertical direction, at a position where the second lead conductor overlaps with the outermost periphery of the second spiral conductor when viewed from the vertical direction.

[0007] A common mode noise filter according to an aspect of the present disclosure has an advantage in that it is possible to suppress a decrease in resistance to high voltages.

[0008] FIG. 1 is an exploded perspective view of a common mode noise filter according to this embodiment. FIG. 2A is a plan view of the common mode noise filter. FIG. 2B is a plan view of the common mode noise filter. FIG. 2C is a plan view of the common mode noise filter. FIG. 2D is a plan view of the common mode noise filter. FIG. 2E is a plan view of the common mode noise filter. FIG. 2F is a plan view of the common mode noise filter. FIG. 3 is an explanatory diagram illustrating the position of a first barrier layer in the common mode noise filter. FIG. 4 is a cross-sectional view of a main portion of the common mode noise filter taken along line X1-X1 in FIGS. 2A to 2F. FIG. 5 is a cross-sectional view of a main portion of the common mode noise filter taken along line X2-X2 in FIGS. 2A to 2F. FIG. 6A is a plan view of a first barrier layer in a common mode noise filter according to a first modified example. FIG. 6B is a plan view of a second barrier layer in the common mode noise filter according to the first modified example. Fig. 7A is a plan view of a first barrier layer in a common mode noise filter of a second modified example. Fig. 7B is a plan view of a second barrier layer in the common mode noise filter of the second modified example. Fig. 8 is a cross-sectional view of a main part of a common mode noise filter of another modified example, in which the first barrier layer is located closer to the first lead conductor than the first spiral conductor. Fig. 9 is a cross-sectional view of a main part of a common mode noise filter of another modified example, in which the first barrier layer is located closer to the first spiral conductor than the first lead conductor.

[0009] The embodiments and modifications described below are merely examples of the present disclosure. The present disclosure is not limited to the embodiments and modifications, and various modifications other than these embodiments and modifications are possible depending on the design, etc., as long as they do not deviate from the technical concept of the present disclosure. The drawings described in the following embodiments and modifications are schematic drawings, and the ratios of the sizes and thicknesses of the components in the drawings do not necessarily reflect the actual dimensional ratios.

[0010] (Embodiment) (1) Overview An overview of the common-mode noise filter 1 according to this embodiment will be described below with reference to FIGS. 1 to 3. FIG. 1 is an exploded perspective view of the common-mode noise filter 1 according to this embodiment. FIGS. 2A to 2F are plan views of the common-mode noise filter 1. FIG. 3 is an explanatory diagram illustrating the position of the first barrier layer 5 in the common-mode noise filter 1. Note that the terms "upper" and "lower" used in this disclosure merely represent the relative positional relationships of the components of the common-mode noise filter 1 and are not intended to limit the direction in which the common-mode noise filter 1 is used. The common-mode noise filter 1 may be used in any orientation in which "lower" used in this disclosure refers to, for example, top, front, rear, left, or right. Although arrows representing up / down, left / right, and front / back are shown in FIGS. 1 and 2A to 2F, these arrows are merely used for explanatory purposes and do not represent any physical entity.

[0011] The common mode noise filter 1 according to this embodiment passes differential mode components of a signal while attenuating common mode noise components. The common mode noise filter 1 is mounted on a circuit board or electronic component of an electronic device.

[0012] 1 , the common mode noise filter 1 includes an element body 2, a first conductor 3, a second conductor 4, a first barrier layer 5, and a second barrier layer 6. The first conductor 3 and the second conductor 4 are provided inside the element body 2 and are aligned in the vertical direction. The first barrier layer 5 is provided inside the element body 2 and is electrically insulated from the first conductor 3. The second barrier layer 6 is provided inside the element body 2 and is electrically insulated from the second conductor 4.

[0013] The first conductor portion 3 has a first spiral conductor 31 and a first lead conductor 32. The first spiral conductor 31 extends in a spiral shape. The first lead conductor 32 is provided on a different plane from the first spiral conductor 31 in the vertical direction, and both ends of the first spiral conductor 31 are led out to the outer surface of the element body 2. Similarly, the second conductor portion 4 has a second spiral conductor 41 and a second lead conductor 42. The second spiral conductor 41 extends in a spiral shape. The second lead conductor 42 is provided on a different plane from the second spiral conductor 41 in the vertical direction, and both ends of the second spiral conductor 41 are led out to the outer surface of the element body 2.

[0014] In the common mode noise filter 1 of this embodiment, the first barrier layer 5 is provided between the first spiral conductor 31 and the first lead conductor 32 in the vertical direction, at a position where the first lead conductor 32 overlaps with the outermost periphery 315 of the first spiral conductor 31 (see FIG. 2C ) when viewed from the vertical direction. Similarly, the second barrier layer 6 is provided between the second spiral conductor 41 and the second lead conductor 42 in the vertical direction, at a position where the second lead conductor 42 overlaps with the outermost periphery 415 of the second spiral conductor 41 (see FIG. 2D ) when viewed from the vertical direction.

[0015] A common-mode noise filter (hereinafter referred to as a "common-mode noise filter of the comparative example") that does not have either a second spiral conductor or two second extension conductors between the first spiral conductor and the two first extension conductors in the vertical direction suffers from the following problem. Specifically, in the common-mode noise filter of the comparative example, when a high voltage is applied to the first spiral conductor and the two first extension conductors, a voltage drop occurs according to the number of turns of the first spiral conductor. This increases the electric field strength between the outermost periphery of the first spiral conductor and the first extension conductor with the longest conductive distance from the outermost periphery. As a result, in the common-mode noise filter of the comparative example, a crack may occur between the outermost periphery of the first spiral conductor and the first extension conductor. As a result, the outermost periphery of the first spiral conductor and the first extension conductor may be electrically connected via the side of the crack, making it impossible to attenuate common-mode noise components. In other words, the common-mode noise filter of the comparative example may have reduced resistance to high voltages.

[0016] However, in the common-mode noise filter 1 of this embodiment, the first barrier layer 5 is provided between the first spiral conductor 31 and the first lead conductor 32 in the vertical direction, at a position where the first lead conductor 32 overlaps with at least the outermost periphery 315 (see FIG. 2C ) of the first spiral conductor 31 when viewed from the vertical direction. Therefore, when a high voltage is applied to the first spiral conductor 31 and the first lead conductor 32, the common-mode noise filter 1 of this embodiment can prevent the occurrence of problems such as those encountered in the common-mode noise filter of the comparative example. That is, suppose a crack occurs between the outermost periphery 315 of the first spiral conductor 31 and one of the two first lead conductors 32 that has a longer conduction distance from the outermost periphery 315. Even in this case, the common-mode noise filter 1 of this embodiment can prevent the crack from connecting to both the outermost periphery 315 of the first spiral conductor 31 and the first lead conductor 322. In other words, when a high voltage is applied to the first spiral conductor 31 and the first extraction conductor 32, the common mode noise filter 1 of this embodiment has the effect of preventing the outermost periphery 315 of the first spiral conductor 31 and the first extraction conductor 32 from being electrically connected to each other through a crack or the side of a crack.

[0017] Similarly, in the common-mode noise filter 1 of this embodiment, the second barrier layer 6 is provided between the second spiral conductor 41 and the second lead conductor 42 in the up-down direction, at a position where the second lead conductor 42 overlaps with at least the outermost periphery 415 (see FIG. 2D ) of the second spiral conductor 41 when viewed from the up-down direction. Therefore, when a high voltage is applied to the second spiral conductor 41 and the second lead conductor 42, the common-mode noise filter 1 of this embodiment has the advantage of being able to prevent the outermost periphery 415 of the second spiral conductor 41 and the second lead conductor 42 from being electrically connected to each other through a crack or the side surface of a fissure.

[0018] As described above, the common mode noise filter 1 of this embodiment has the advantage of being able to suppress a decrease in resistance to high voltages.

[0019] (2) Detailed Configuration (2-1) Overall Configuration The detailed configuration of the common mode noise filter 1 will be described below with reference to Figures 1 to 5. Figure 4 is a cross-sectional view of a main portion of the common mode noise filter 1 taken along line X1-X1 in Figures 2A to 2F. Figure 5 is a cross-sectional view of a main portion of the common mode noise filter 1 taken along line X2-X2 in Figures 2A to 2F.

[0020] As shown in FIG. 1 , the common mode noise filter 1 includes an element body 2, a first conductor portion 3, a second conductor portion 4, a first barrier layer 5, a second barrier layer 6, vias B1, B2, B3, and B4, and a magnetic member 7.

[0021] As shown in Fig. 1 , the first conductor section 3 has a first spiral conductor 31 and a first lead conductor 32. As shown in Fig. 2A , the first conductor section 3 has two first lead conductors 321 and 322 as the first lead conductor 32. The first lead conductor 321 and the first spiral conductor 31 are electrically connected via a via B1. Furthermore, the first lead conductor 322 and the first spiral conductor 31 are electrically connected via a via B2. In short, the first lead conductor 321 and the first lead conductor 322 are electrically connected via the via B1, the first spiral conductor 31, and the via B2.

[0022] Similarly, as shown in Fig. 1, the second conductor section 4 has a second spiral conductor 41 and a second lead conductor 42. As shown in Fig. 2F, the second conductor section 4 has two second lead conductors 421, 422 as the second lead conductor 42. The second lead conductor 421 and the second spiral conductor 41 are electrically connected via via B3. Furthermore, the second lead conductor 422 and the second spiral conductor 41 are electrically connected via via B4. In short, the second lead conductor 421 and the second lead conductor 422 are electrically connected via via B3, the second spiral conductor 41, and via B4.

[0023] One of the first lead conductors 321 and 322 is used as a first input terminal, and the other is used as a first output terminal. One of the second lead conductors 421 and 422 is used as a second input terminal, and the other is used as a second output terminal. That is, the common mode noise filter 1 has a first input terminal, a second input terminal, a first output terminal, and a second output terminal. The common mode noise filter 1 removes common mode noise from a differential signal input via the first input terminal and the second input terminal, and outputs the signal from the first output terminal and the second output terminal.

[0024] (2-2) Element Body As shown in Fig. 1, the element body 2 includes a plurality of (17 in Fig. 1) insulator layers 20. The plurality of insulator layers 20 are stacked in the vertical direction.

[0025] The multiple insulator layers 20 include insulator layers 21, 22, 23, 24, 25, 26, 27, 201, 202, 203, 204, 2a, 2b, 2c, 2d, 2e, and 2f. The multiple insulator layers 20 are stacked in the following order from top to bottom: insulator layers 2a, 201, 2b, 202, 2c, 21, 22, 23, 24, 25, 26, 27, 2d, 203, 2e, 204, and 2f. Note that adjacent insulator layers 20 may be integrated to the extent that the boundaries between the layers are not visible.

[0026] The insulator layers 21 to 27 and 201 to 204 are non-magnetic layers. The non-magnetic layers include, for example, glass ceramic as a material. As an example, in FIG. 1, the thickness of the insulator layers 201 to 204 is greater than the thickness of the insulator layers 21 to 27. In this disclosure, "thickness" refers to the dimension in the vertical direction.

[0027] The insulating layers 2a to 2f are magnetic layers. The magnetic layers contain, for example, ferrite. For example, the thickness of the magnetic layers (insulating layers 2a to 2f) is greater than the thickness of the non-magnetic layers (insulating layers 21 to 27).

[0028] In this embodiment, as shown in FIG. 1 , the first extraction conductors 321, 322 are provided on a first plane inside the element body 2. The first barrier layer 5 is provided on a second plane inside the element body 2. The first spiral conductor 31 is provided on a third plane inside the element body 2. The second spiral conductor 41 is provided on a fourth plane inside the element body 2. The second barrier layer 6 is provided on a fifth plane inside the element body 2. The second extraction conductors 421, 422 are provided on a sixth plane inside the element body 2. The first to sixth planes are aligned vertically and parallel to each other. Note that "parallel" in the present disclosure is not limited to parallel in the strict sense, but also includes cases where there is an error of several degrees.

[0029] In this embodiment, the first lead conductors 321 and 322 are provided between the insulator layer 21 and the insulator layer 22. The first barrier layer 5 is provided between the insulator layer 22 and the insulator layer 23. The first spiral conductor 31 is provided between the insulator layer 23 and the insulator layer 24. The second spiral conductor 41 is provided between the insulator layer 24 and the insulator layer 25. The second barrier layer 6 is provided between the insulator layer 25 and the insulator layer 26. The second lead conductors 421 and 422 are provided between the insulator layer 26 and the insulator layer 27.

[0030] (2-3) First Spiral Conductor First, the first spiral conductor 31 will be described. When viewed from the top-bottom direction, the first spiral conductor 31 has a spiral shape. That is, the first spiral conductor 31 is a conductor formed in a spiral shape. More specifically, the first spiral conductor 31 has a shape in which a conductor is wound multiple times around an oval. The length of the area occupied by the first spiral conductor 31 in the front-to-rear direction is shorter than the length of the area occupied by the first spiral conductor 31 in the left-to-right direction. In the illustrated example, the first spiral conductor 31 has five turns, but the number of turns is not particularly limited. The first spiral conductor 31 is made of a conductive material such as silver.

[0031] 2C , the first spiral conductor 31 includes a first turn portion 311, a second turn portion 312, a third turn portion 313, a fourth turn portion 314, and a fifth turn portion 315. Of the portions 311 to 315, the first turn portion 311 is located on the innermost side, and the fifth turn portion 315 is located on the outermost side. In other words, the fifth turn portion 315 is the outermost periphery of the first spiral conductor 31.

[0032] That is, the first spiral conductor 31 has a plurality of first turn portions including the outermost periphery 315 of the first spiral conductor 31 in a top view from the vertical direction. Each of the plurality of first turn portions here has a shape in which the conductor is wound once around an oval, that is, a portion corresponding to each circumference (each turn) of the spirally formed first spiral conductor 31. In this embodiment, the plurality of first turn portions are portions 311 to 315.

[0033] The first conductor portion 3 further includes a via pad 33 electrically connected to the via B1 and a via pad 34 electrically connected to the via B2. Each of the via pads 33, 34 is provided on a third plane inside the element body 2, i.e., on the same plane as the first spiral conductor 31 (on the same plane). Each of the via pads 33, 34 is provided between the insulator layer 23 and the insulator layer 24. The via pad 33 is provided on the outside of the first spiral conductor 31, and the via pad 34 is provided on the inside of the first spiral conductor 31. When viewed from the top and bottom, each of the via pads 33, 34 has a rectangular shape with rounded corners. The via pads 33, 34 are made of a conductive material such as silver.

[0034] A first end 316 on the fifth turn portion 315 (outermost periphery) side of the first spiral conductor 31 is seamlessly connected to the via pad 33. That is, the via pad 33 is a conductive via pad electrically connected to the via B1 and the first spiral conductor 31.

[0035] Similarly, the second end 317 of the first spiral conductor 31 on the first turn portion 311 side is seamlessly connected to the via pad 34. That is, the via pad 34 is a conductive via pad electrically connected to the via B2 and the first spiral conductor 31.

[0036] (2-4) First Lead Conductor Next, the first lead conductors 321 and 322 will be described. The first lead conductor 321 leads the first end 316 of the first spiral conductor 31 to the outer surface of the element body 2. Similarly, the first lead conductor 322 leads the second end 317 of the first spiral conductor 31 to the outer surface of the element body 2. As shown in Fig. 2A, each of the first lead conductors 321 and 322 is arranged on the outer edge of the element body 2. In this embodiment, the first lead conductors 321 and 322 are aligned in the left-right direction.

[0037] The first conductor portion 3 further includes a via pad 35 electrically connected to the via B1 and a via pad 36 electrically connected to the via B2. Each of the via pads 35, 36 is provided on a first plane inside the element body 2, i.e., on the same plane (coplanar) as the first lead conductors 321, 322. Each of the via pads 35, 36 is provided between the insulator layer 21 and the insulator layer 22. When viewed from the top-bottom direction, the via pad 35 is provided at a position overlapping with the via pad 33, and the via pad 36 is provided at a position overlapping with the via pad 34. When viewed from the top-bottom direction, each of the via pads 35, 36 has a rectangular shape with rounded corners. The via pads 35, 36 are made of a conductive material such as silver.

[0038] 2A , the first extraction conductor 321 of this embodiment has a rectangular shape with rounded corners when viewed from the top and bottom. A portion of the lower edge of the first extraction conductor 321 is seamlessly connected to the via pad 35. That is, the via pad 35 is a current-carrying via pad electrically connected to the via B1 and the first extraction conductor 321. As described above, the first extraction conductor 321 is electrically connected to the fifth turn portion 315 (the outermost periphery of the first spiral conductor 31) through the via pad 35, the via B1, and the via pad 33.

[0039] On the other hand, the first extraction conductor 322 of this embodiment has a first portion 323 and a second portion 324. When viewed from the top-bottom direction, the first portion 323 has a rectangular shape with rounded corners. The second portion 324 extends from a part of the lower edge of the first portion 323 and is seamlessly connected to the via pad 36. In other words, the via pad 36 is a current-carrying via pad electrically connected to the via B2 and the first extraction conductor 322. As described above, the first extraction conductor 322 is electrically connected to the first turn portion 311 via the via pad 36, the via B2, and the via pad 34.

[0040] In other words, the first lead conductor 321 has a shorter conductive distance from the outermost periphery 315 of the first spiral conductor 31 than the first lead conductor 322. In other words, the first lead conductor 322 has a longer conductive distance from the outermost periphery 315 of the first spiral conductor 31 than the first lead conductor 321.

[0041] (2-5) Second Spiral Conductor The second spiral conductor 41 will now be described. When viewed from the top-bottom direction, the second spiral conductor 41 has a spiral shape. That is, the second spiral conductor 41 is a conductor formed in a spiral shape. More specifically, the second spiral conductor 41 has a shape in which a conductor is wound multiple times around an oval. The length of the area occupied by the second spiral conductor 41 in the front-to-rear direction is shorter than the length of the area occupied by the second spiral conductor 41 in the left-to-right direction. In the illustrated example, the number of turns in the second spiral conductor 41 is five, but the number of turns is not particularly limited. The second spiral conductor 41 is made of a conductive material such as silver.

[0042] 2D , the second spiral conductor 41 includes a first turn portion 411, a second turn portion 412, a third turn portion 413, a fourth turn portion 414, and a fifth turn portion 415. Of the portions 411 to 415, the first turn portion 411 is located on the innermost side, and the fifth turn portion 415 is located on the outermost side. In other words, the fifth turn portion 415 is the outermost periphery of the second spiral conductor 41.

[0043] That is, the second spiral conductor 41 has a plurality of second turn portions including the outermost periphery 415 of the second spiral conductor 41 in a top view from the vertical direction. Each of the plurality of second turn portions has a shape in which the conductor is wound once around an oval, that is, a portion corresponding to each circumference (each turn) of the spirally formed second spiral conductor 41. In this embodiment, the plurality of second turn portions are portions 411 to 415.

[0044] As shown in FIG. 2D , the second conductor portion 4 further includes a via pad 43 electrically connected to the via B3 and a via pad 44 electrically connected to the via B4. Each of the via pads 43 and 44 is provided on a fourth plane inside the element body 2, i.e., the same plane as the second spiral conductor 41 (coplanar). Each of the via pads 43 and 44 is provided between the insulator layer 24 and the insulator layer 25. The via pad 43 is provided on the outside of the second spiral conductor 41, and the via pad 44 is provided on the inside of the second spiral conductor 41. When viewed from the top and bottom, each of the via pads 43 and 44 has a rectangular shape with rounded corners. The via pads 43 and 44 are made of a conductive material such as silver.

[0045] A first end 416 on the fifth turn portion 415 (outermost periphery) side of the second spiral conductor 41 is seamlessly connected to the via pad 43. The via pad 43 is a conductive via pad electrically connected to the via B3 and the second spiral conductor 41.

[0046] Similarly, a second end 417 of the second spiral conductor 41 on the first turn portion 411 side is seamlessly connected to the via pad 44. The via pad 44 is a conductive via pad electrically connected to the via B4 and the second spiral conductor 41.

[0047] (2-6) Second Lead Conductor Next, the second lead conductors 421, 422 will be described. The second lead conductor 421 leads the first end 416 of the second spiral conductor 41 to the outer surface of the element body 2. Similarly, the second lead conductor 422 leads the second end 417 of the second spiral conductor 41 to the outer surface of the element body 2. When viewed from the top-bottom direction, each of the second lead conductors 421, 422 is provided outside the second spiral conductor 41. More specifically, each of the second lead conductors 421, 422 is arranged on the outer edge of the element body 2. The second lead conductors 421, 422 of this embodiment are aligned in the left-right direction, as shown in FIG. 2F .

[0048] The second conductor portion 4 further includes a via pad 45 electrically connected to the via B3 and a via pad 46 electrically connected to the via B4. Each of the via pads 45, 46 is provided on a sixth plane within the element body 2, i.e., the same plane as the second lead conductors 421, 422 (on the same plane). Each of the via pads 45, 46 is provided between the insulator layer 26 and the insulator layer 27. When viewed from the top-bottom direction, the via pad 45 is provided at a position overlapping with the via pad 43, and the via pad 46 is provided at a position overlapping with the via pad 44. When viewed from the top-bottom direction, each of the via pads 45, 46 has a rectangular shape with rounded corners. The via pads 45, 46 are made of a conductive material such as silver.

[0049] 2F , the second extraction conductor 421 of this embodiment has a rectangular shape with rounded corners when viewed from the top and bottom. A portion of the upper edge of the second extraction conductor 421 is seamlessly connected to the via pad 45. The via pad 45 is a current-carrying via pad electrically connected to the via B3 and the second extraction conductor 421. As described above, the second extraction conductor 421 is electrically connected to the fifth turn portion 415 (the outermost periphery of the second spiral conductor 41) through the via pad 45, the via B3, and the via pad 43.

[0050] On the other hand, the second extraction conductor 422 of this embodiment has a first portion 423 and a second portion 424. When viewed from the top-bottom direction, the first portion 423 has a rectangular shape with rounded corners. The second portion 424 extends from a part of the upper edge of the first portion 423 and is seamlessly connected to the via pad 46. In other words, the via pad 46 is a current-carrying via pad electrically connected to the via B4 and the second extraction conductor 422. As described above, the second extraction conductor 422 is electrically connected to the first turn portion 411 via the via pad 46, the via B4, and the via pad 44.

[0051] In other words, the second lead conductor 421 has a shorter conductive distance from the outermost periphery 415 of the second spiral conductor 41 than the second lead conductor 422. In other words, the second lead conductor 422 has a longer conductive distance from the outermost periphery 415 of the second spiral conductor 41 than the second lead conductor 421.

[0052] (2-7) Vias Each of the vias B1, B2, B3, and B4 has a length in the vertical direction. Each of the vias B1, B2, B3, and B4 has a cylindrical shape with its axis extending in the vertical direction.

[0053] 1, the via B1 electrically connects the via pad 33 and the via pad 35. That is, the via B1 electrically connects the first spiral conductor 31 and the first lead conductor 321 through the via pad 33 and the via pad 35. Here, the insulator layer 23 is disposed between the first spiral conductor 31 and the first lead conductor 321. As shown in FIG. 2B, the via B1 penetrates the insulator layer 23, thereby electrically connecting the first spiral conductor 31 and the first lead conductor 321 through the via pad 33 and the via pad 35.

[0054] 1, the via B2 electrically connects the via pad 34 and the via pad 36. That is, the via B2 electrically connects the first spiral conductor 31 and the first lead conductor 322 through the via pad 34 and the via pad 36. Here, the insulator layer 23 is disposed between the first spiral conductor 31 and the first lead conductor 322. As shown in FIG. 2B, the via B2 penetrates the insulator layer 23, thereby electrically connecting the first spiral conductor 31 and the first lead conductor 322 through the via pad 34 and the via pad 36.

[0055] 1, the via B3 electrically connects the via pad 43 and the via pad 45. That is, the via B3 electrically connects the second spiral conductor 41 and the second lead conductor 421 through the via pad 43 and the via pad 45. Here, the insulator layer 26 is disposed between the second spiral conductor 41 and the second lead conductor 421. As shown in FIG. 2E, the via B3 penetrates the insulator layer 26, thereby electrically connecting the second spiral conductor 41 and the second lead conductor 421 through the via pad 43 and the via pad 45.

[0056] 1, the via B4 electrically connects the via pad 44 and the via pad 46. That is, the via B4 electrically connects the second spiral conductor 41 and the second lead conductor 422 through the via pad 44 and the via pad 46. Here, the insulator layer 26 is disposed between the second spiral conductor 41 and the second lead conductor 422. As shown in FIG. 2E, the via B4 penetrates the insulator layer 26, thereby electrically connecting the second spiral conductor 41 and the second lead conductor 422 through the via pad 44 and the via pad 46.

[0057] (2-8) First Barrier Layer The first barrier layer 5 is provided between the insulator layer 22 and the insulator layer 23. That is, the first barrier layer 5 is provided between the first spiral conductor 31 and the first lead conductors 321 and 322 in the vertical direction. As shown in Fig. 2B, the first barrier layer 5 in this embodiment has an L-shape when viewed from the vertical direction.

[0058] 3 , the first barrier layer 5 is provided between the first spiral conductor 31 and the first lead conductors 321, 322 in the up-down direction, at a position where the first lead conductors 321, 322 overlap with the outermost periphery 315 of the first spiral conductor 31 as viewed in the up-down direction. When a high voltage is applied to the first spiral conductor 31 and the first lead conductors 321, 322, a crack may occur between the outermost periphery 315 of the first spiral conductor 31 and the first lead conductor 322, which has the longest conductive distance from the outermost periphery 315, of the two first lead conductors 321, 322. Even in such a case, the above configuration can prevent the crack from connecting to both the outermost periphery 315 of the first spiral conductor 31 and the first lead conductor 322. That is, when a high voltage is applied to the first spiral conductor 31 and the first lead conductors 321, 322, the common mode noise filter 1 has the effect of preventing the outermost periphery 315 of the first spiral conductor 31 from being electrically connected to the first lead conductor 322 through a crack or the side surface of a crack. In short, the common mode noise filter 1 of this embodiment has the advantage of preventing a decrease in resistance to high voltage.

[0059] In this embodiment, the first barrier layer 5 is provided to include positions where the first extension conductor 32 overlaps with each of the portions 311, 312, 313, 314, and 315 of the first spiral conductor 31 when viewed from the top-bottom direction. That is, in this embodiment, the first barrier layer 5 is provided to include positions where the first extension conductor 322 overlaps with the above-mentioned multiple first turn portions of the first spiral conductor 31 when viewed from the top-bottom direction. When a high voltage is applied to the first spiral conductor 31 and the first extension conductors 321 and 322, for example, a crack or fissure may occur (i.e., diagonally) between the portion 314 of the first spiral conductor 31 and the first extension conductor 322, which has the longest conduction distance from the outermost periphery 315 of the two first extension conductors 321 and 322. Even in such a case, the above configuration can prevent the crack or fissure from connecting to both the portion 314 of the first spiral conductor 31 and the first extension conductor 322. That is, when a high voltage is applied to the first spiral conductor 31 and the first lead conductors 321 and 322, the common mode noise filter 1 has the advantage of further preventing electrical connection between the portion 314 of the first spiral conductor 31 and the first lead conductor 322 through the side surfaces of cracks or fissures. Similarly, when a high voltage is applied to the first spiral conductor 31 and the first lead conductors 321 and 322, the common mode noise filter 1 has the advantage of further preventing electrical connection between each of the portions 311, 312, and 313 of the first spiral conductor 31 and the first lead conductor 322 through the side surfaces of cracks or fissures. In short, the common mode noise filter 1 of this embodiment has the advantage of further preventing a decrease in resistance to high voltages.

[0060] The first barrier layer 5 is made of a material having a greater breaking strength than the element body 2. For example, since the insulator layers 21 to 27 and 201 to 204 contain glass ceramic as a material, the first barrier layer 5 is made of a material having a greater breaking strength than glass ceramic. Specifically, the first barrier layer 5 is made of a metal material or a resin material. In this embodiment, the first barrier layer 5 is made of a conductive material such as silver, which is the same material as the first spiral conductor 31 and the first extraction conductor 32. Note that the "breaking strength" referred to in this disclosure refers to the degree of resistance to breakage, i.e., the degree to which breakage is unlikely to occur. In other words, the higher the breaking strength, the less likely breakage will occur, i.e., the lower the likelihood of breakage occurring.

[0061] As described above, in the common-mode noise filter 1, the first barrier layer 5 is made of a material having a greater breaking strength than the element body 2. This has the effect of making it easier to prevent electrical connection between the outermost periphery 315 of the first spiral conductor 31 and the first lead conductor 322 via a crack or the side surface of a crack when a high voltage is applied to the first spiral conductor 31 and the first lead conductors 321, 322. In short, the common-mode noise filter 1 of this embodiment has the advantage of making it easier to prevent a decrease in resistance to high voltages.

[0062] 4 , a first distance D1, which is the distance between the first extraction conductor 322 and the first barrier layer 5 in the vertical direction, is the same as a second distance D2, which is the distance between the first barrier layer 5 and the first spiral conductor 31 in the vertical direction. More specifically, the first distance D1 here is the distance between the lower surface of the first extraction conductor 322 and the upper surface of the first barrier layer 5 in the vertical direction. Similarly, the second distance D2 here is the distance between the lower surface of the first barrier layer 5 and the upper surface of the outermost periphery 315 of the first spiral conductor 31 in the vertical direction. In short, the thickness of the insulator layer 22 is the same as the thickness of the insulator layer 23, and the first barrier layer 5 is provided at the center between the first spiral conductor 31 and the first extraction conductor 322 in the vertical direction. Note that, in the present disclosure, "being the same" is not limited to being completely the same, but also includes cases where they are different within a practically acceptable range. For example, if the difference between two distances is within a range of less than 5% of either value, they may be considered to be "the same" and the present disclosure may be applied.

[0063] With the above configuration, the common-mode noise filter 1 has the advantage of being more likely to prevent electrical connection between the outermost periphery 315 of the first spiral conductor 31 and the first lead conductor 322 through a crack or the side surface of a crack when a high voltage is applied to the first spiral conductor 31 and the first lead conductors 321, 322. In short, the common-mode noise filter 1 of this embodiment has the advantage of being more likely to prevent a decrease in resistance to high voltage.

[0064] (2-9) Second Barrier Layer The second barrier layer 6 is provided between the insulator layer 25 and the insulator layer 26. That is, the second barrier layer 6 is provided between the second spiral conductor 41 and the second lead conductor 422 in the up-down direction. As shown in Fig. 2E, the second barrier layer 6 in this embodiment has an L-shape when viewed from the up-down direction.

[0065] The second barrier layer 6 is provided between the second spiral conductor 41 and the second lead conductor 422 in the vertical direction, at a position where the second lead conductor 422 and the outermost periphery 415 (see FIG. 2D ) of the second spiral conductor 41 overlap when viewed in the vertical direction. When a high voltage is applied to the second spiral conductor 41 and the second lead conductors 421, 422, a crack may occur between the outermost periphery 415 of the second spiral conductor 41 and the second lead conductor 422, whichever of the two second lead conductors 421, 422 has the longest conductive distance from the outermost periphery 415. Even in such a case, the above configuration can prevent the crack from connecting to both the outermost periphery 415 of the second spiral conductor 41 and the second lead conductor 422. That is, when a high voltage is applied to the second spiral conductor 41 and the second lead conductors 421, 422, the common mode noise filter 1 has the effect of preventing the outermost periphery 415 of the second spiral conductor 41 from being electrically connected to the second lead conductor 422 through a crack or the side surface of a crack. In short, the common mode noise filter 1 of this embodiment has the advantage of preventing a decrease in resistance to high voltage.

[0066] In this embodiment, the second barrier layer 6 is provided to include positions where the second extension conductor 422 overlaps with each of the portions 411, 412, 413, 414, and 415 of the second spiral conductor 41 when viewed from the top-bottom direction. That is, in this embodiment, the second barrier layer 6 is provided to include positions where the second extension conductor 422 overlaps with the above-mentioned multiple second turn portions of the second spiral conductor 41 when viewed from the top-bottom direction. When a high voltage is applied to the second spiral conductor 41 and the second extension conductors 421 and 422, for example, a crack or fissure may occur (i.e., diagonally) between the portion 414 of the second spiral conductor 41 and the second extension conductor 422 that has the longest conduction distance from the outermost periphery 415 of the two second extension conductors 421 and 422. Even in such a case, the above configuration can further prevent the crack or fissure from connecting to both the portion 414 of the second spiral conductor 41 and the second extension conductor 422. That is, when a high voltage is applied to the second spiral conductor 41 and the second lead conductors 421, 422, the common mode noise filter 1 has the advantage of further preventing the portion 414 of the second spiral conductor 41 from being electrically connected to the second lead conductor 422 through the side surfaces of cracks or fissures. Similarly, when a high voltage is applied to the second spiral conductor 41 and the second lead conductors 421, 422, the common mode noise filter 1 has the advantage of further preventing the portions 411, 412, 413 of the second spiral conductor 41 from being electrically connected to the second lead conductor 422 through the side surfaces of cracks or fissures. In short, the common mode noise filter 1 of this embodiment has the advantage of further preventing a decrease in resistance to high voltages.

[0067] The second barrier layer 6 is made of a material having a greater breaking strength than the element body 2. For example, since the insulator layers 21 to 27 and 201 to 204 contain glass ceramic as a material, the second barrier layer 6 is made of a material having a greater breaking strength than glass ceramic. Specifically, the second barrier layer 6 is made of a metal material or a resin material. In this embodiment, the second barrier layer 6 is made of a conductive material such as silver, which is the same material as the second spiral conductor 41 and the second lead conductor 42.

[0068] As described above, in the common mode noise filter 1, the second barrier layer 6 is made of a material having a greater breaking strength than the element body 2. This has the effect of making it easier to prevent electrical connection between the outermost periphery 415 of the second spiral conductor 41 and the second lead conductor 422 through a crack or the side surface of a crack when a high voltage is applied to the second spiral conductor 41 and the second lead conductors 421, 422. In short, the common mode noise filter 1 of this embodiment has the advantage of making it easier to prevent a decrease in resistance to high voltages.

[0069] 5 , a third distance D3, which is the distance between the second spiral conductor 41 and the second barrier layer 6 in the vertical direction, is the same as a fourth distance D4, which is the distance between the second barrier layer 6 and the second lead conductor 422 in the vertical direction. More specifically, the third distance D3 here is the distance between the lower surface of the outermost periphery 415 of the second spiral conductor 41 and the upper surface of the second barrier layer 6 in the vertical direction. Similarly, the fourth distance D4 here is the distance between the lower surface of the second barrier layer 6 and the upper surface of the second lead conductor 422 in the vertical direction. In short, the thickness of the insulator layer 25 is the same as the thickness of the insulator layer 26, and the second barrier layer 6 is provided at the center between the second spiral conductor 41 and the second lead conductor 422 in the vertical direction.

[0070] With the above configuration, the common-mode noise filter 1 has the advantage of being more likely to prevent electrical connection between the outermost periphery 415 of the second spiral conductor 41 and the second lead conductor 422 through a crack or the side surface of a crack when a high voltage is applied to the second spiral conductor 41 and the second lead conductors 421, 422. In short, the common-mode noise filter 1 of this embodiment has the advantage of being more likely to prevent a decrease in resistance to high voltage.

[0071] (2-10) Magnetic Member A magnetic member 7 is provided in the central portion of the first spiral conductor 31 and the second spiral conductor 41. As shown in FIG. 1, the magnetic member 7 in this embodiment has a cylindrical shape with its axial direction extending in the vertical direction. The magnetic member 7 is made of a magnetic material such as ferrite. For this reason, the magnetic member 7 is also called a ferrite via.

[0072] The provision of the magnetic member 7 in the central portion of the first spiral conductor 31 and the second spiral conductor 41 has the advantage of improving the performance of the common mode noise filter 1 in attenuating common mode noise components.

[0073] In this embodiment, the upper end of the magnetic member 7 is connected to the insulating layer 2c, and the lower end of the magnetic member 7 is connected to the insulating layer 2d.

[0074] (3) Effects In the common-mode noise filter 1 according to this embodiment, the first barrier layer 5 is provided between the first spiral conductor 31 and the first lead conductor 322 in the vertical direction, at a position where the first lead conductor 322 overlaps with the outermost periphery 315 of the first spiral conductor 31 when viewed from the vertical direction. Furthermore, the second barrier layer 6 is provided between the second spiral conductor 41 and the second lead conductor 422 in the vertical direction, at a position where the second lead conductor 422 overlaps with the outermost periphery 415 of the second spiral conductor 41 when viewed from the vertical direction.

[0075] This advantageously prevents electrical connection between the outermost periphery 315 of the first spiral conductor 31 and the first lead conductor 322 through the side surfaces of a crack or fissure when a high voltage is applied to the first spiral conductor 31 and the first lead conductors 321, 322. Similarly, this advantageously prevents electrical connection between the outermost periphery 415 of the second spiral conductor 41 and the second lead conductor 422 through the side surfaces of a crack or fissure when a high voltage is applied to the second spiral conductor 41 and the second lead conductors 421, 422. In short, the common mode noise filter 1 of this embodiment has the advantage of being able to prevent a decrease in resistance to high voltages.

[0076] Furthermore, in the common-mode noise filter 1 of this embodiment, the first spiral conductor 31 has a plurality of first turn portions including the outermost periphery 315 of the first spiral conductor 31 in a top view from the vertical direction. The first barrier layer 5 is provided so as to include positions where the first lead conductor 322 and the above-mentioned plurality of first turn portions of the first spiral conductor 31 overlap with each other in a top view from the vertical direction. Furthermore, the second spiral conductor 41 has a plurality of second turn portions including the outermost periphery 415 of the second spiral conductor 41 in a top view from the vertical direction. The second barrier layer 6 is provided so as to include positions where the second lead conductor 422 and the above-mentioned plurality of second turn portions of the second spiral conductor 41 overlap with each other in a top view from the vertical direction.

[0077] This advantageously prevents electrical connection between the portions 311, 312, 313, and 314 of the first spiral conductor 31 and the first lead conductor 322 via the side surfaces of cracks or fissures when a high voltage is applied to the first spiral conductor 31 and the first lead conductors 321 and 322. Similarly, this advantageously prevents electrical connection between the portions 411, 412, 413, and 414 of the second spiral conductor 41 and the second lead conductor 422 via the side surfaces of cracks or fissures when a high voltage is applied to the second spiral conductor 41 and the second lead conductors 421 and 422. In short, the common mode noise filter 1 of this embodiment has the advantage of further preventing a decrease in resistance to high voltages.

[0078] Furthermore, in the common-mode noise filter 1 of this embodiment, the first distance D1, which is the distance between the first lead conductor 322 and the first barrier layer 5 in the vertical direction, is the same as the second distance D2, which is the distance between the first barrier layer 5 and the first spiral conductor 31 in the vertical direction. Furthermore, the third distance D3, which is the distance between the second spiral conductor 41 and the second barrier layer 6 in the vertical direction, is the same as the fourth distance D4, which is the distance between the second barrier layer 6 and the second lead conductor 422 in the vertical direction.

[0079] This provides the advantage that, when a high voltage is applied to the first spiral conductor 31 and the first lead conductors 321, 322, the common mode noise filter 1 is more likely to prevent electrical connection between the outermost periphery 315 of the first spiral conductor 31 and the first lead conductor 322 through the side surfaces of a crack or fissure. Similarly, when a high voltage is applied to the second spiral conductor 41 and the second lead conductors 421, 422, the common mode noise filter 1 is more likely to prevent electrical connection between the outermost periphery 415 of the second spiral conductor 41 and the second lead conductor 422 through the side surfaces of a crack or fissure. In short, the common mode noise filter 1 of this embodiment has the advantage of more easily preventing a decrease in resistance to high voltage.

[0080] Furthermore, in the common mode noise filter 1 of this embodiment, the first barrier layer 5 and the second barrier layer 6 are each made of a material having a greater breaking strength than the element body 2 .

[0081] This advantageously prevents electrical connection between the outermost periphery 315 of the first spiral conductor 31 and the first lead conductor 322 through the side surfaces of cracks or fissures when a high voltage is applied to the first spiral conductor 31 and the first lead conductors 321, 322. Similarly, this advantageously prevents electrical connection between the outermost periphery 415 of the second spiral conductor 41 and the second lead conductor 422 through the side surfaces of cracks or fissures when a high voltage is applied to the second spiral conductor 41 and the second lead conductors 421, 422. In short, the common mode noise filter 1 of this embodiment has the advantage of easily preventing a decrease in resistance to high voltages.

[0082] (4) Modifications The above-described embodiment is merely one of various embodiments of the present disclosure. The above-described embodiment can be modified in various ways depending on the design, etc., as long as the object of the present disclosure can be achieved. The following modifications may be realized in appropriate combination. The same components as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0083] (4-1) First Modification First, a common-mode noise filter 1A according to a first modification will be described with reference to Fig. 6A and Fig. 6B. Fig. 6A is a plan view of a first barrier layer 5A in the common-mode noise filter 1A of the first modification. Fig. 6B is a plan view of a second barrier layer 6A in the common-mode noise filter 1A of the first modification.

[0084] In the common-mode noise filter 1 of the above-described embodiment, the first barrier layer 5 and the second barrier layer 6 each have an L-shape when viewed from above. However, as shown in Figures 6A and 6B , in the common-mode noise filter 1A of the first modified example, the first barrier layer 5A has a curved shape that curves along the first lead conductor 322 (see Figure 2A ), and the second barrier layer 6A has a curved shape that curves along the second lead conductor 422 (see Figure 2F ), when viewed from above. More specifically, the first barrier layer 5A has a curved shape that curves along the second portion 324 of the first lead conductor 322 (see Figure 2A ), and the second barrier layer 6A has a curved shape that curves along the second portion 424 of the second lead conductor 422 (see Figure 2F ), when viewed from above.

[0085] According to the above configuration, the area of ​​the first barrier layer 5A can be made smaller than that of the first barrier layer 5 of the embodiment. Furthermore, when a high voltage is applied to the first spiral conductor 31 and the first lead conductors 321 and 322, the common-mode noise filter 1A of the first modified example exhibits the effect of further suppressing electrical connection between the portions 311, 312, 313, and 314 and the outermost periphery 315 of the first spiral conductor 31 and the first lead conductor 322 via a crack or the side surface of a crack. Similarly, the area of ​​the second barrier layer 6A can be made smaller than that of the second barrier layer 6 of the embodiment. Furthermore, the common-mode noise filter 1A of the first modification has the effect of further suppressing electrical connection between the second spiral conductor 41 and the second lead conductor 422 via cracks or side surfaces of cracks, when a high voltage is applied to the second spiral conductor 41 and the second lead conductor 421, 422. In short, the common-mode noise filter 1A of the first modification has the advantage of further suppressing a decrease in resistance to high voltages while reducing the area of ​​each of the first barrier layer 5A and the second barrier layer 6A.

[0086] (4-2) Second Modification Next, a common-mode noise filter 1B according to a second modification will be described with reference to Figs. 7A and 7B. Fig. 7A is a plan view of a first barrier layer 5B in the common-mode noise filter 1B of the second modification. Fig. 7B is a plan view of a second barrier layer 6B in the common-mode noise filter 1B of the second modification.

[0087] In the common-mode noise filter 1 of the above-described embodiment, the first barrier layer 5 and the second barrier layer 6 each have an L-shape when viewed from above. However, as shown in Figures 7A and 7B, in a common-mode noise filter 1B of the second modified example, the first barrier layer 5B and the second barrier layer 6B each have a rectangular shape when viewed from above.

[0088] The above configuration has the advantage that the first barrier layer 5B and the second barrier layer 6B can be easily provided.

[0089] (4-3) Other Modifications Other modifications of the above-described embodiment are listed below. The following modifications may be implemented in appropriate combination.

[0090] In the above-described embodiment, the first barrier layer 5 is provided at a position where the first extraction conductor 32 overlaps with each of the portions 311, 312, 313, 314, and 315 of the first spiral conductor 31 when viewed from the top-bottom direction. However, the first barrier layer 5 does not have to be provided at a position where the first extraction conductor 32 overlaps with each of the portions 311, 312, 313, and 314 of the first spiral conductor 31 when viewed from the top-bottom direction. That is, the first barrier layer 5 only needs to be provided at a position where the first extraction conductors 321 and 322 overlap with at least the portion 315 (outermost periphery 315) of the first spiral conductor 31 when viewed from the top-bottom direction. As an example, the first barrier layer 5 may be provided at a position where the first extraction conductor 32 overlaps with each of the portions 314 and 315 of the first spiral conductor 31 when viewed from the top-bottom direction. In other words, the first barrier layer 5 does not have to be provided at a position where the first extraction conductor 32 and each of the portions 311, 312, and 313 of the first spiral conductor 31 overlap each other when viewed from the top and bottom.

[0091] Similarly, in the above-described embodiment, the second barrier layer 6 is provided at a position where the second extraction conductor 422 overlaps with each of the portions 411, 412, 413, 414, and 415 of the second spiral conductor 41 when viewed from the top-bottom direction. However, the second barrier layer 6 does not have to be provided at a position where the second extraction conductor 422 overlaps with each of the portions 411, 412, 413, and 414 of the second spiral conductor 41 when viewed from the top-bottom direction. That is, the second barrier layer 6 only needs to be provided at a position where the second extraction conductor 422 overlaps with at least the portion 415 (the outermost periphery 415) of the second spiral conductor 41 when viewed from the top-bottom direction. As an example, the second barrier layer 6 may be provided at a position where the second extraction conductor 422 overlaps with each of the portions 414 and 415 of the second spiral conductor 41 when viewed from the top-bottom direction. In other words, the second extraction conductor 422 does not have to be positioned so as to overlap with each of the portions 411, 412, and 413 of the second spiral conductor 41 when viewed from above and below.

[0092] In the above-described embodiment, the first barrier layer 5 and the second barrier layer 6 each have an L-shape when viewed from the top-bottom direction. However, the shape of the first barrier layer 5 is not limited as long as the first barrier layer 5 is provided at a position where the first extraction conductors 321, 322 overlap with at least a portion 315 (outermost periphery 315) of the first spiral conductor 31 when viewed from the top-bottom direction. Similarly, the shape of the second barrier layer 6 is not limited as long as the second barrier layer 6 is provided at a position where the second extraction conductor 422 overlaps with at least a portion 415 (outermost periphery 415) of the second spiral conductor 41 when viewed from the top-bottom direction.

[0093] As another modification, a modification regarding the positions of the first barrier layer 5 and the second barrier layer 6 will be described below.

[0094] First, a common-mode noise filter 1C according to another modified example will be described with reference to Fig. 8. Fig. 8 is a cross-sectional view of a main part of the common-mode noise filter 1C according to another modified example, in which the first barrier layer 5C is provided at a position closer to the first lead conductor 322 than the first spiral conductor 31.

[0095] In the above-described embodiment, as shown in Fig. 4, the first distance D1, which is the distance between the first lead conductor 322 and the first barrier layer 5 in the vertical direction, and the second distance D2, which is the distance between the first barrier layer 5 and the first spiral conductor 31 in the vertical direction, are the same. However, as shown in Fig. 8, in the common-mode noise filter 1C, the fifth distance D5, which is the distance between the first lead conductor 322 and the first barrier layer 5C in the vertical direction, may be smaller than the sixth distance D6, which is the distance between the first barrier layer 5C and the first spiral conductor 31 in the vertical direction.

[0096] 4, the thickness of the insulator layer 22 is the same as the thickness of the insulator layer 23, and the first barrier layer 5 is provided in the center in the vertical direction between the first spiral conductor 31 and the first lead conductor 322. However, as shown in FIG. 8, the thickness of the insulator layer 22C may be smaller than the thickness of the insulator layer 23C, and the first barrier layer 5C may be provided in a position closer to the first lead conductor 322 than the first spiral conductor 31 in the vertical direction.

[0097] 5, the thickness of the insulator layer 25 is the same as the thickness of the insulator layer 26, and the second barrier layer 6 is provided in the center in the vertical direction between the second spiral conductor 41 and the second lead conductor 422. However, the second barrier layer 6 may be provided in a position closer to the second lead conductor 422 than to the second spiral conductor 41 in the vertical direction.

[0098] Next, a common-mode noise filter 1D according to another modification will be described with reference to Fig. 9. Fig. 9 is a cross-sectional view of a main part of the common-mode noise filter 1D according to another modification, in which the first barrier layer 5D is provided at a position closer to the first spiral conductor 31 than the first lead conductor 322.

[0099] In the above-described embodiment, as shown in Fig. 4, the first distance D1, which is the distance between the first lead conductor 322 and the first barrier layer 5 in the vertical direction, and the second distance D2, which is the distance between the first barrier layer 5 and the first spiral conductor 31 in the vertical direction, are the same. However, as shown in Fig. 9, in the common-mode noise filter 1D, the seventh distance D7, which is the distance between the first lead conductor 322 and the first barrier layer 5D in the vertical direction, may be greater than the eighth distance D8, which is the distance between the first barrier layer 5D and the first spiral conductor 31 in the vertical direction.

[0100] In short, in the above-described embodiment, the thickness of the insulator layer 22 is the same as the thickness of the insulator layer 23, and the first barrier layer 5 is provided in the center in the vertical direction between the first spiral conductor 31 and the first lead conductor 322. However, as shown in Fig. 9, the thickness of the insulator layer 22D may be greater than the thickness of the insulator layer 23D, and the first barrier layer 5D may be provided in a position closer to the first spiral conductor 31 in the vertical direction than the first lead conductor 322.

[0101] 5, the thickness of the insulator layer 25 is the same as the thickness of the insulator layer 26, and the second barrier layer 6 is provided in the center in the vertical direction between the second spiral conductor 41 and the second lead conductor 422. However, the second barrier layer 6 may be provided in a position closer to the second spiral conductor 41 than to the second lead conductor 422 in the vertical direction.

[0102] In the above-described embodiment, each of the first spiral conductor 31 and the second spiral conductor 41 has a shape in which a conductor is wound multiple times around an oval. However, each of the first spiral conductor 31 and the second spiral conductor 41 may have a shape in which a conductor is wound multiple times around a circle or a rectangle.

[0103] In the above-described embodiment, the shape of the first lead conductor 321 is a rectangle with rounded corners when viewed from the top and bottom. However, the shape of the first lead conductor 321 is not limited to the shape of the above-described embodiment, as long as it allows the first end 316 of the first spiral conductor 31 to be led out to the outer surface of the element body 2. Similarly, the shape of the first lead conductor 322 is not limited to the shape of the above-described embodiment, as long as it allows the second end 317 of the first spiral conductor 31 to be led out to the outer surface of the element body 2.

[0104] In the above-described embodiment, the shape of the second lead conductor 421 is a rectangle with rounded corners when viewed from the top and bottom. However, the shape of the second lead conductor 421 is not limited to the shape of the above-described embodiment, as long as it allows the first end 416 of the second spiral conductor 41 to be led out to the outer surface of the element body 2. Similarly, the shape of the second lead conductor 422 is not limited to the shape of the above-described embodiment, as long as it allows the second end 417 of the second spiral conductor 41 to be led out to the outer surface of the element body 2.

[0105] In the above embodiment, the via B1 electrically connects the first spiral conductor 31 and the first lead conductor 321 through the via pads 33 and 35. However, the via B1 may electrically connect the first spiral conductor 31 and the first lead conductor 321 without going through the via pads 33 and 35. Similarly, the via B2 may electrically connect the first spiral conductor 31 and the first lead conductor 322 without going through the via pads 34 and 36. That is, the first conductor portion 3 does not have to have the via pads 33, 34, 35, and 36.

[0106] In the above embodiment, the via B3 electrically connects the second spiral conductor 41 and the second lead conductor 421 through the via pads 43 and 45. However, the via B3 may electrically connect the second spiral conductor 41 and the second lead conductor 421 without the via pads 43 and 45. Similarly, the via B4 may electrically connect the second spiral conductor 41 and the second lead conductor 422 without the via pads 44 and 46. That is, the second conductor portion 4 does not have to have the via pads 43, 44, 45, and 46.

[0107] In the above embodiment, the common mode noise filter 1 includes the magnetic member 7, but it does not necessarily have to include the magnetic member 7.

[0108] In the above-described embodiment, the common mode noise filter 1 has a rectangular parallelepiped shape with its axis extending in the vertical direction, but may have a cylindrical, square pyramidal, or truncated conical shape with its axis extending in the vertical direction.

[0109] (Summary) A common mode noise filter (1, 1A to 1D) of a first aspect includes an element body (2), a first conductor portion (3), a second conductor portion (4), a first barrier layer (5, 5A to 5D), and a second barrier layer (6, 6A, 6B). The first conductor portion (3) and the second conductor portion (4) are provided inside the element body (2) and are aligned vertically. The first barrier layer (5, 5A to 5D) is provided inside the element body (2) and is electrically insulated from the first conductor portion (3). The second barrier layer (6, 6A, 6B) is provided inside the element body (2) and is electrically insulated from the second conductor portion (4). The first conductor portion (3) includes a first spiral conductor (31) and a first lead conductor (32). The first spiral conductor (31) extends in a spiral shape. The first lead conductor (32) is provided on a different plane from the first spiral conductor (31) in the vertical direction, and both ends of the first spiral conductor (31) are led out to the outer surface of the element body (2). The second conductor portion (4) has a second spiral conductor (41) and a second lead conductor (42). The second spiral conductor (41) extends in a spiral shape. The second lead conductor (42) is provided on a different plane from the second spiral conductor (41) in the vertical direction, and both ends of the second spiral conductor (41) are led out to the outer surface of the element body (2). The first barrier layer (5, 5A to 5D) is provided between the first spiral conductor (31) and the first lead conductor (32) in the vertical direction, at a position where the first lead conductor (32) and the outermost periphery (315) of the first spiral conductor (31) overlap when viewed in the vertical direction. The second barrier layer (6, 6A, 6B) is arranged between the second spiral conductor (41) and the second extraction conductor (42) in the vertical direction, at a position where the second extraction conductor (42) and the outermost periphery (415) of the second spiral conductor (41) overlap when viewed from the vertical direction.

[0110] This embodiment has the advantage of being able to suppress a decrease in resistance to high voltage.

[0111] In a common mode noise filter (1, 1A to 1D) of a second aspect, in the first aspect, the first spiral conductor (31) has a plurality of first turn portions including the outermost periphery (315) of the first spiral conductor (31) when viewed from above in a plan view in the vertical direction. The first barrier layer (5, 5A to 5D) is provided so as to include positions where the first lead conductor (32) and the plurality of first turn portions of the first spiral conductor (31) overlap when viewed from above in a plan view in the vertical direction. The second spiral conductor (41) has a plurality of second turn portions including the outermost periphery (415) of the second spiral conductor (41) when viewed from above in a plan view in the vertical direction. The second barrier layer (6, 6A, 6B) is provided so as to include positions where the second lead conductor (42) and the plurality of second turn portions of the second spiral conductor (41) overlap when viewed from above in a plan view in the vertical direction.

[0112] This embodiment has the advantage that the decrease in resistance to high voltage can be further suppressed.

[0113] In a common mode noise filter (1, 1A, 1B) of a third aspect, in the first or second aspect, the first distance (D1) and the second distance (D2) are the same. The first distance (D1) is the distance between the first lead conductor (32) and the first barrier layer (5, 5A, 5B) in the vertical direction. The second distance (D2) is the distance between the first barrier layer (5, 5A, 5B) and the first spiral conductor (31) in the vertical direction. The third distance (D3) and the fourth distance (D4) are the same. The third distance (D3) is the distance between the second spiral conductor (41) and the second barrier layer (6, 6A, 6B) in the vertical direction. The fourth distance (D4) is the distance between the second barrier layer (6, 6A, 6B) and the second lead conductor (42) in the vertical direction.

[0114] This embodiment has the advantage that it is easier to prevent a decrease in resistance to high voltage.

[0115] A common mode noise filter (1, 1A to 1D) of a fourth aspect is any one of the first to third aspects, wherein the first barrier layer (5, 5A, 5B) and the second barrier layer (6, 6A, 6B) are each made of a material having a breaking strength greater than that of the element body (2).

[0116] This embodiment has the advantage that it is easier to suppress a decrease in resistance to high voltage.

[0117] 1, 1A to 1D Common mode noise filter 2 Element body 3 First conductor portion 31 First spiral conductor 315 Outermost circumference 32 First lead conductor 4 Second conductor portion 41 Second spiral conductor 42 Second lead conductor 5, 5A to 5D First barrier layer 6, 6A, 6B Second barrier layer D1 First distance D2 Second distance D3 Third distance D4 Fourth distance

Claims

1. A semiconductor device comprising: an element body; a first conductor portion and a second conductor portion provided inside the element body and aligned in a vertical direction; a first barrier layer provided inside the element body and electrically insulated from the first conductor portion; and a second barrier layer provided inside the element body and electrically insulated from the second conductor portion; wherein the first conductor portion has: a first spiral conductor extending in a spiral shape; and a first lead conductor provided on a different plane from the first spiral conductor in the vertical direction, the first lead conductor leading both ends of the first spiral conductor to the outer surface of the element body; and wherein the second conductor portion has: a second spiral conductor extending in a spiral shape; and a second lead conductor provided on a different plane from the second spiral conductor in the vertical direction, the second lead conductor leading both ends of the second spiral conductor to the outer surface of the element body; a common mode noise filter, wherein the first barrier layer is provided between the first spiral conductor and the first lead conductor in the vertical direction, at a position where the first lead conductor and the outermost periphery of the first spiral conductor overlap when viewed from the vertical direction, and the second barrier layer is provided between the second spiral conductor and the second lead conductor in the vertical direction, at a position where the second lead conductor and the outermost periphery of the second spiral conductor overlap when viewed from the vertical direction.

2. A common mode noise filter as described in claim 1, wherein the first spiral conductor has a plurality of first turn portions including the outermost periphery of the first spiral conductor when viewed in a plan view from the vertical direction, the first barrier layer is arranged to include a position where the first lead-out conductor and the plurality of first turn portions of the first spiral conductor overlap when viewed in the vertical direction, the second spiral conductor has a plurality of second turn portions including the outermost periphery of the second spiral conductor when viewed in the plan view from the vertical direction, and the second barrier layer is arranged to include a position where the second lead-out conductor and the plurality of second turn portions of the second spiral conductor overlap when viewed in the vertical direction.

3. A common mode noise filter as described in claim 1 or 2, wherein a first distance, which is the distance between the first lead-out conductor and the first barrier layer in the vertical direction, and a second distance, which is the distance between the first barrier layer and the first spiral conductor in the vertical direction, are the same; and a third distance, which is the distance between the second spiral conductor and the second barrier layer in the vertical direction, and a fourth distance, which is the distance between the second barrier layer and the second lead-out conductor in the vertical direction, are the same.

4. A common mode noise filter according to claim 1 or 2, wherein each of the first barrier layer and the second barrier layer is made of a material having a breaking strength greater than that of the element body.

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