Noise filter

Abstract

To arrange both ends of a rectangular wire at one end in an axial direction without extending the length of the rectangular wire constituting an edgewise coil.SOLUTION: The first edgewise coil 22A and the second edgewise coil 22B are formed of only one flat wire 21, and the first coil portion 23A and the second coil portion 23B are arranged coaxially with each other and are arranged in a common region in the axial direction. A first base end portion 23A of the first coil portion 28A in the axial direction and a second base end portion 23B of the second coil portion 28B in the axial direction are connected to each other, the first connecting terminal-portion 29A extends from a front end portion of the first coil portion 23A in the axial direction, and the second connecting terminal-portion 29B extends from a front end portion of the second coil portion 23B in the axial direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to noise filters. [Background technology]

[0002] Patent Document 1 discloses a noise filter in which one end of an insulated electric wire constituting a coil member extends to one side in the axial direction of the coil member, and the other end of the insulated electric wire extends to the other side in the axial direction. Both ends of the coil member function as a current input terminal and a current output terminal. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-076565 Summary of the Invention [Problem to be solved by the invention]

[0004] Depending on the wiring configuration of the circuit connected to the noise filter, it may be necessary to place both the input terminal and the output terminal at one end of the coil member in the axial direction. In this case, one of the input and output terminals must make a U-turn and extend to the vicinity of the other terminal, which results in a longer insulated wire constituting the coil member.

[0005] The noise filter of the present disclosure was completed based on the above circumstances, and aims to position both ends of the flat wire that constitutes the edgewise coil at one end in the axial direction of the edgewise coil without extending the length of the flat wire. [Means for solving the problem]

[0006] The noise filter of the present disclosure comprises: a first edgewise coil having a first coil portion and a first connection terminal portion; a second edgewise coil having a second coil portion and a second connection terminal portion, The first edgewise coil and the second edgewise coil are each formed of a single rectangular wire, the first coil portion and the second coil portion are arranged coaxially with each other and in a common region in the axial direction, a first base end portion of the first coil portion in the axial direction and a second base end portion of the second coil portion in the axial direction are connected to each other, the first connection terminal portion extends from a tip end portion of the first coil portion in the axial direction, The second connection terminal portion extends from the tip end portion of the second coil portion in the axial direction. [Effects of the Invention]

[0007] According to the present disclosure, both ends of the rectangular wire can be arranged at one end in the axial direction of the edgewise coil. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a noise filter according to a first embodiment. [Figure 2] FIG. 2 is a plan view of the noise filter. [Figure 3] FIG. 3 is a front view of the noise filter. [Figure 4] FIG. 4 is a left side view of the noise filter. [Figure 5] FIG. 5 is a cross-sectional view taken along line XX in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line YY in FIG. [Figure 7] FIG. 7 is a perspective view of the noise filter of the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be listed and described. Any combination of the following multiple embodiments within a range that does not cause contradictions is also included in the description of the present invention.

[0010] The noise filter of the present disclosure comprises: (1) A coil coil comprising a first edgewise coil having a first coil portion and a first connection terminal portion, and a second edgewise coil having a second coil portion and a second connection terminal portion, wherein the first edgewise coil and the second edgewise coil are formed from only one flat wire, the first coil portion and the second coil portion are arranged coaxially with each other and in a common area in the axial direction, a first base end portion in the axial direction of the first coil portion and a second base end portion in the axial direction of the second coil portion are connected to each other, the first connection terminal portion extends from a tip end portion in the axial direction of the first coil portion, and the second connection terminal portion extends from a tip end portion in the axial direction of the second coil portion.

[0011] According to the configuration of the present disclosure, a single rectangular wire is used to form a double coil consisting of a first coil portion and a second coil portion connected to each other at the base end in the axial direction, thereby realizing that the first and second connection terminal portions, which are both ends of the rectangular wire, can be disposed at the axial tip end (one end) of the first and second coil portions without extending the length of the rectangular wire that constitutes the first edgewise coil and the second edgewise coil.

[0012] (2) In (1), it is preferable that the first connection terminal abuts against the second coil portion in the axial direction, and the second connection terminal abuts against the first coil portion in the axial direction. Because the thickness direction of the flat wire in the first coil portion and the second coil portion is oriented in the axial direction, they can elastically deform individually to expand in the axial direction. If the first coil portion and the second coil portion elastically deform in different ways, there is a concern that the magnetic field may become unstable. To address this, the first connection terminal abuts against the second coil portion in the axial direction, and the second connection terminal abuts against the first coil portion in the axial direction. This configuration prevents the first coil portion and the second coil portion from elastically deforming in different ways, thereby avoiding magnetic field instability.

[0013] (3) In (2), it is preferable that the first coil portion is disposed radially inward, the second coil portion is disposed radially outward, and the first connection terminal portion abuts against the second coil portion so as to cross the flat wire. With this configuration, when the first coil portion and the second coil portion are viewed in the axial direction, it is only necessary to lead the first connection terminal portion radially outward without bending it.

[0014] (4) In (2) or (3), it is preferable that the first coil portion is disposed radially inward, the second coil portion is disposed radially outward, and the second connection terminal portion is bent radially inward as viewed in the axial direction to abut against the first coil portion. According to this configuration, a configuration in which the second connection terminal portion abuts against the first coil portion can be realized by bending the second connection terminal portion.

[0015] (5) In (1) or (2), it is preferable that the first connection terminal portion and the second connection terminal portion are arranged at positions that are rotationally symmetric when viewed in the axial direction. With this configuration, the first connection terminal portion and the second connection terminal portion can be arranged at predetermined positions without considering the circumferential orientation of the first edgewise coil and the second edgewise coil.

[0016] (6) In any of (1) to (3), the core has a configuration in which a pair of flange portions are arranged at both axial ends of a shaft portion, the first coil portion and the second coil portion are arranged to coaxially surround the shaft portion, and at least a portion of the first coil portion and the second coil portion overlap with the pair of flange portions when viewed in the axial direction. According to the configuration of the present disclosure, at least a portion of the first coil portion and the second coil portion are arranged to be sandwiched between the pair of flange portions, so there is no risk of the first coil portion or the second coil portion coming off the core in the axial direction. Therefore, according to the present disclosure, the first coil portion and the second coil portion can be maintained in a wound state around the core without high-temperature treatment.

[0017] (7) In (6), it is preferable that the flange portion has a protrusion that presses the first coil portion or the second coil portion in the axial direction. This configuration can prevent the first coil portion or the second coil portion from rattling in the axial direction relative to the core.

[0018] (8) In (6), it is preferable that the core is arranged with the axial direction facing up and down, and that the lower flange portion of the pair of flange portions has a size that overlaps the entire first coil portion and the entire second coil portion when viewed in the axial direction. With this configuration, the first coil portion and the second coil portion can be stably placed on the lower flange portion.

[0019] (9) In (6), it is preferable that the first coil portion and the second coil portion are elastically deformable in the radial direction, and at least one of the pair of flange portions is sized to overlap only an inner peripheral region of the first coil portion or the second coil portion when viewed in the axial direction. With this configuration, the first coil portion or the second coil portion can be easily slipped under at least one of the flange portions.

[0020] (10) In (6), the shaft portion, the first coil portion, and the second coil portion may be non-circular when viewed in the axial direction. This configuration can prevent the first edgewise coil and the second edgewise coil from rotating relative to the core.

[0021] [Details of the embodiments of the present disclosure] [Example 1] A noise filter 1 according to a first embodiment of the present disclosure will be described with reference to FIGS. 1 to 6. The present invention is not limited to these examples, but is defined by the claims, and includes all modifications within the meaning and scope of the claims. In this first embodiment, the F direction in FIGS. 1, 2, 4, and 6 is defined as the front. The H direction in FIGS. 1, 3 to 5 is defined as the up. The L direction in FIGS. 1 to 3, 5, and 6 is defined as the left. The up and down direction and the axial direction are used interchangeably.

[0022] The noise filter 1 of the first embodiment is configured to include one core 10 and one edgewise coil 20. The core 10 is a member made of a magnetic substance such as iron, or a member containing a magnetic material. The core 10 has a prismatic shaft portion 11 and upper and lower flange portions 12 and 13 formed on both axial ends of the shaft portion 11. The core 10 is used with its axis oriented in the vertical direction.

[0023] In an axial view (plan view) of the core 10 viewed in the axial direction of the shaft portion 11, the shaft portion 11, the upper flange portion 12, and the lower flange portion 13 form a square. The centers of the upper flange portion 12 and the lower flange portion 13 when viewed in the axial direction coincide with the center of the shaft portion 11. The length of one side of the upper flange portion 12 is greater than the length of one side of the shaft portion 11. The length of one side of the lower flange portion 13 is greater than the length of one side of the upper flange portion 12. Four protrusions 14 are formed on the lower surface of the upper flange portion 12 (the surface facing the lower flange portion 13). The four protrusions 14 are located at the center positions of each side of the upper flange portion 12 in the longitudinal direction.

[0024] The edgewise coil 20 is a single component formed by bending a single rectangular wire 21. The cross-sectional shape of the rectangular wire 21 is a rectangular wire with a relatively large ratio of long sides to short sides. The rectangular wire 21 is a component in which a conductor made of a conductive material such as copper, aluminum, or carbon nanotubes is surrounded by an insulating coating. The rectangular wire 21 is bent so that its short side (thickness direction) faces the axial direction (vertical direction) and forms a square when viewed in the axial direction. The edgewise coil 20 is arranged to surround the shaft portion 11 when viewed in the axial direction. When viewed from the front of the noise filter 1, the edgewise coil 20 is arranged to be sandwiched between the upper flange portion 12 and the lower flange portion 13.

[0025] The edgewise coil 20 is composed of a first edgewise coil 22A and a second edgewise coil 22B. When viewed in the axial direction, the first edgewise coil 22A and the second edgewise coil 22B form a square as a whole. In detail, at the corners of the square, two sides of the inner circumferential surface that are adjacent at right angles are connected via a quarter-circular arc with a small radius of curvature, and two sides of the outer circumferential surface that are adjacent at right angles are connected via a quarter-circular arc with a small radius of curvature.

[0026] The first edgewise coil 22A has a first coil portion 23A and a first connection terminal portion 29A. The first coil portion 23A is a portion obtained by spirally forming the rectangular wire 21 so as to form a square when viewed in the axial direction. The first coil portion 23A is elastically deformable and expands in the axial direction. The first coil portion 23A is disposed coaxially with the shaft portion 11, with its inner circumferential surface directly adjacent to and facing the outer circumferential surface of the shaft portion 11. The first coil portion 23A is placed on the upper surface of the lower flange portion 13 across its entire horizontal area. When viewed in the axial direction, the first coil portion 23A has a first front edge portion 24A, a first rear edge portion 25A, a first right edge portion 26A, and a first left edge portion 27A.

[0027] The first front edge portion 24A is a portion located in front of the shaft portion 11 and is formed by stacking portions of the rectangular wire 21 extending in the left-right direction in the axial direction. The first rear edge portion 25A is a portion located behind the shaft portion 11 and is formed by stacking portions of the rectangular wire 21 extending in the left-right direction in the axial direction. The first right edge portion 26A is a portion located to the right of the shaft portion 11 and is formed by stacking portions of the rectangular wire 21 extending in the front-rear direction in the axial direction. The first left edge portion 27A is a portion located to the left of the shaft portion 11 and is formed by stacking portions of the rectangular wire 21 extending in the front-rear direction in the axial direction.

[0028] The front end of the rectangular wire 21 constituting the first edgewise coil 22A (first coil portion 23A) at the lowest position of the first left edge portion 27A is defined as a first base end portion 28A. The rectangular wire 21 constituting the first edgewise coil 22A extends spirally from the first base end portion 28A through the first left edge portion 27A, the first rear edge portion 25A, the first right edge portion 26A, and the first front edge portion 24A, and then returns to the first left edge portion 27A.

[0029] The portions of the rectangular wire 21 that form the first rear edge 25A, the first right edge 26A, and the first left edge 27A are horizontally arranged in a front view and in a side view of the noise filter 1. The portion of the rectangular wire 21 that forms the first front edge 24A is inclined upward from the right end to the left end in a front view. The portion of the rectangular wire 21 that forms the first front edge 24A is arranged to connect the front end of the right edge to the front end of the first left edge 27A, which is one step higher than the right edge.

[0030] The portion of the first edgewise coil 22A (rectangular wire 21) extending from the uppermost section of the first rear edge portion 25A is defined as the first connection terminal portion 29A. When viewed in the axial direction, the first connection terminal portion 29A is formed by extending the right end of the first rear edge portion 25A to the right without bending it. The extending end (right end) of the first connection terminal portion 29A is located to the right of the right edge of the lower flange portion 13.

[0031] The square region on the inner periphery of first coil portion 23A overlaps with upper flange portion 12 when viewed in the axial direction. In other words, the square region on the inner periphery of first coil portion 23A is disposed so as to be recessed under upper flange portion 12. Of the uppermost sections of first coil portion 23A, protrusions 14 of upper flange portion 12 are pressed against the upper surfaces of first left edge portion 27A and first rear edge portion 25A so as to bite into them. First coil portion 23A is sandwiched in the vertical direction between lower flange portion 13 and upper flange portion 12 by the pressure of protrusions 14. Therefore, first coil portion 23A is held in a state in which its relative movement in the vertical direction (axial direction) with respect to core 10 is restricted.

[0032] The second edgewise coil 22B includes a second coil portion 23B and a second connection terminal portion 29B. The second coil portion 23B is a portion of the rectangular wire 21 formed into a spiral shape so as to form a square when viewed in the axial direction. The second coil portion 23B is elastically deformable and expands in the axial direction. The second coil portion 23B is arranged coaxially with the shaft portion 11 and the first coil portion 23A, with its inner circumferential surface directly adjacent to and facing the outer circumferential surface of the first coil portion 23A. The entire horizontal area of ​​the second coil portion 23B is placed on the upper surface of the lower flange portion 13. When viewed in the axial direction, the second coil portion 23B includes a second front edge portion 24B, a second rear edge portion 25B, a second right edge portion 26B, and a second left edge portion 27B.

[0033] The second front edge portion 24B is a portion located in front of the first front edge portion 24A and is formed by laminating portions of the rectangular wire 21 extending in the left-right direction in the axial direction. The second rear edge portion 25B is a portion located behind the first rear edge portion 25A and is formed by laminating portions of the rectangular wire 21 extending in the left-right direction in the axial direction. The second right edge portion 26B is a portion located to the right of the first right edge portion 26A and is formed by laminating portions of the rectangular wire 21 extending in the front-rear direction in the axial direction. The second left edge portion 27B is a portion located to the left of the second left edge portion 27B and is formed by laminating portions of the rectangular wire 21 extending in the front-rear direction in the axial direction. The second coil portion 23B does not overlap the upper flange portion 12 throughout its entirety when viewed in the axial direction.

[0034] The front end of the rectangular wire 21 constituting the second edgewise coil 22B (second coil portion 23B) at the bottom of the second left edge 27B is defined as the second base end 28B. The rectangular wire 21 constituting the second edgewise coil 22B extends spirally, repeating a path from the second base end 28B to the second left edge 27B, the second rear edge 25B, the second right edge 26B, the second front edge 24B, and back to the second left edge 27B. At the bottom of the edgewise coil 20, the second base end 28B and the first base end 28A are connected in a U-turn while in contact with the upper surface of the lower flange portion 13.

[0035] The portions of the rectangular wire 21 that form the second rear edge 25B, the second right edge 26B, and the second left edge 27B are horizontally arranged in front and side views. The portion of the rectangular wire 21 that forms the second front edge 24B is inclined upward from the right end to the left end in front view. The portion of the rectangular wire 21 that forms the second front edge 24B is arranged to connect the front end of the second right edge 26B to the front end of the second left edge 27B, which is one step higher than the second right edge 26B.

[0036] The portion of the second edgewise coil 22B (flat wire 21) extending from the second rear edge portion 25B located at the uppermost stage is defined as the second connection terminal portion 29B. When viewed in the axial direction, the second connection terminal portion 29B bends from the left end of the second front edge portion 24B along the left edge of the upper flange portion 12, then bends leftward from the rear end of the extending portion and extends away from the upper flange portion 12. The portion of the second connection terminal portion 29B along the left edge of the upper flange portion 12 is positioned to abut against or closely face the uppermost end surface of the first left edge portion 27A from above. Therefore, there is no risk of the first coil portion 23A moving upward relative to the second coil portion 23B. The extending end (left end) of the second connection terminal portion 29B is located to the left of the left edge of the lower flange portion 13.

[0037] The portion of the first connection terminal 29A that protrudes to the right of the upper flange 12 is bent so as to ride on the uppermost end surface of the second right edge 26B in a front view and is disposed so as to abut against or face closely to the rear end of the uppermost end surface of the second right edge 26B from above. Therefore, there is no risk of the second coil 23B moving upward relative to the first coil 23A.

[0038] In the axial direction of the core 10 and the edgewise coil 20, the first connection terminal 29A and the second connection terminal 29B are arranged at one end (upper end). When viewed in the axial direction, the first connection terminal 29A and the second connection terminal 29B have a rotationally symmetrical positional relationship. A communication circuit (not shown) that is the target of noise suppression by the noise filter 1 is connected to the first connection terminal 29A and the second connection terminal 29B. One of the first connection terminal 29A and the second connection terminal 29B functions as an input terminal, and the other functions as an output terminal.

[0039] The noise filter 1 of the first embodiment includes a core 10 and an edgewise coil 20. The core 10 has a shaft portion 11 and a pair of flange portions (an upper flange portion 12 and a lower flange portion 13) disposed at both axial ends of the shaft portion 11. The edgewise coil 20 is a member disposed so as to coaxially surround the shaft portion 11. When viewed in the axial direction of the shaft portion 11, at least a portion of the edgewise coil 20 (the inner peripheral region of the first coil portion 23A) overlaps with the upper flange portion 12 and the lower flange portion 13. With this configuration, at least a portion of the edgewise coil 20 is disposed so as to be sandwiched between the pair of flange portions (the upper flange portion 12 and the lower flange portion 13), and therefore there is no risk of the edgewise coil 20 detaching from the core 10 in the axial direction. Therefore, according to the first embodiment, the edgewise coil 20 can be maintained in a wound state around the core 10 without high-temperature treatment.

[0040] Upper flange portion 12 has protrusions 14 that press against first coil portion 23A in the axial direction. This configuration can prevent first coil portion 23A from rattling relative to core 10 in the axial direction.

[0041] The core 10 is disposed with its axis oriented in the vertical direction. When viewed in the axial direction, the lower flange portion 13 of the pair of flange portions is large enough to overlap the entire first coil portion 23A and the entire second coil portion 23B. With this configuration, the first edgewise coil 22A (first coil portion 23A) and the second edgewise coil 22B (second coil portion 23B) can be stably placed on the lower flange portion 13.

[0042] The first coil portion 23A and the second coil portion 23B are elastically deformable in the radial direction. When viewed in the axial direction, at least one flange portion (upper flange portion 12) of the pair of flange portions (upper flange portion 12 and lower flange portion 13) is sized to overlap only the inner peripheral region of the first coil portion 23A. With this configuration, when attaching the edgewise coil 20 to the core 10, the first coil portion 23A can be easily slipped under the upper flange portion 12.

[0043] When viewed in the axial direction, the shaft portion 11, the first coil portion 23A, and the second coil portion 23B are non-circular. This configuration makes it possible to prevent the first edgewise coil 22A and the second edgewise coil 22B from rotating relative to the core 10.

[0044] The noise filter 1 includes a first edgewise coil 22A and a second edgewise coil 22B. The first edgewise coil 22A includes a first coil portion 23A and a first connection terminal portion 29A. The second edgewise coil 22B includes a second coil portion 23B and a second connection terminal portion 29B. The first edgewise coil 22A and the second edgewise coil 22B are formed using only a single rectangular wire 21. The first coil portion 23A and the second coil portion 23B are coaxially arranged and located in a common area in the axial direction. A first base end portion 28A of the first coil portion 23A in the axial direction and a second base end portion 28B of the second coil portion 23B in the axial direction are connected to each other. The first connection terminal portion 29A extends from the axial tip (upper end) of the first coil portion 23A. The second connection terminal portion 29B extends from the tip portion (upper end portion) of the second coil portion 23B in the axial direction.

[0045] According to this configuration, a double coil consisting of the first coil portion 23A and the second coil portion 23B connected to each other at their base ends in the axial direction is configured using a single rectangular wire 21. This makes it possible to arrange the first connection terminal portion 29A and the second connection terminal portion 29B, which are both ends of the rectangular wire 21, at the leading ends (one end) of the first coil portion 23A and the second coil portion 23B in the axial direction without extending the length of the rectangular wire 21 that configures the first edgewise coil 22A and the second edgewise coil 22B.

[0046] Because the thickness direction of the flat wire 21 is oriented in the axial direction, the first coil portion 23A and the second coil portion 23B can elastically deform individually, stretching in the axial direction. If the first coil portion 23A and the second coil portion 23B elastically deform in different ways, there is a concern that the magnetic field may become unstable. To address this issue, the first connection terminal portion 29A is axially abutted against the uppermost end surface of the second coil portion 23B, and the second connection terminal portion 29B is axially abutted against the uppermost end surface of the first coil portion 23A. This configuration prevents the first coil portion 23A and the second coil portion 23B from elastically deforming in different ways, thereby avoiding magnetic field instability.

[0047] The first coil portion 23A is disposed radially inward, and the second coil portion 23B is disposed radially outward relative to the first coil portion 23A. The first connection terminal portion 29A abuts against the second coil portion 23B so as to cross the rectangular wire 21. With this configuration, when viewed in the axial direction, the first connection terminal portion 29A only needs to be led out radially outward without being bent. The second connection terminal portion 29B abuts against the first coil portion 23A by being bent radially inward when viewed in the axial direction. With this configuration, a configuration in which the second connection terminal portion 29B abuts against the first coil portion 23A can be realized by bending the second connection terminal portion 29B.

[0048] The first connection terminal 29A and the second connection terminal 29B are arranged at positions that are rotationally symmetric when viewed in the axial direction. With this configuration, the first connection terminal 29A and the second connection terminal 29B can be arranged at predetermined positions without considering the circumferential orientation of the first edgewise coil 22A and the second edgewise coil 22B.

[0049] [Example 2] A noise filter 2 according to a second embodiment of the present disclosure will be described with reference to Fig. 7. In this second embodiment, with respect to the front-to-rear direction, the F direction in Fig. 7 is defined as the front. With respect to the up-down direction, the H direction in Fig. 7 is defined as the up. With respect to the left-to-right direction, the L direction in Fig. 7 is defined as the left.

[0050] The noise filter 2 of the second embodiment is configured to include one core 40 and one edgewise coil 50. The core 40 is a member made of a magnetic substance such as iron, or a single component containing a magnetic material. The core 40 has a prismatic shaft portion 41 and a flange portion 42 formed at the lower end of the shaft portion 41 in the axial direction. The core 40 is used with its axis oriented in the vertical direction. In an axial view (plan view) of the core 40 viewed in the axial direction of the shaft portion 41, the shaft portion 41 and the flange portion 42 form a concentric square.

[0051] The edgewise coil 50 is a single component formed by bending a single rectangular wire 60. The cross-sectional shape of the rectangular wire 60 is a rectangular wire with a relatively large ratio of long sides to short sides. The rectangular wire 60 may consist of only a conductor, or may be a conductor surrounded by an insulating coating. The rectangular wire 60 has a folded portion 63, a first extending portion 61 extending from the folded portion 63, and a second extending portion 62 extending from the folded portion 63. The folded portion 63 is a portion where the rectangular wire 60 is bent so as to be reversed in the thickness direction (short side direction). The first extending portion 61 and the second extending portion 62 extend parallel to each other, with the second extending portion 62 overlapping the first extending portion 61. The first extending portion 61 and the second extending portion 62 form a single deemed strand 64.

[0052] The edgewise coil 50 has one coil main body 52, a first connection terminal 58A, and a second connection terminal 58B. The coil main body 52 has a square shape when viewed in the axial direction, and is disposed so as to surround the shaft portion 41 while being placed on the flange portion 42. The edgewise coil 50 is composed of a first edgewise coil 51A and a second edgewise coil 51B. The first edgewise coil 51A has a first coil portion 53A and a first connection terminal 58A. The second edgewise coil 51B has a second coil portion 53B and a second connection terminal 58B.

[0053] The first coil portion 53A and the second coil portion 53B form a square coil main body 52. ​​The coil main body 52 is formed by extending a wire 64 spirally from a folded portion 63. The first coil portion 53A is formed by a first extending portion 61. The second coil portion 53B is formed by a second extending portion 62. A first base end portion 59A (lower end portion) in the axial direction (vertical direction) of the first coil portion 53A and a second base end portion 59B (lower end portion) in the axial direction (vertical direction) of the second coil portion 53B are connected at the folded portion 63. In the coil main body 52, the first extending portions 61 and the second extending portions 62 are arranged so as to be alternately stacked in the axial direction. The first extending portions 61 of the first coil portion 53A and the second extending portions 62 of the second coil portion 53B are alternately stacked in the axial direction. Therefore, it is difficult for the first coil portion 53A and the second coil portion 53B to elastically deform separately from each other in the axial direction.

[0054] The coil main body 52 has a front edge 54, a rear edge 55, a right edge 56, and a left edge 57. The front edge 54 is a portion located in front of the shaft 41 and is formed by stacking portions of the assumed wires 64 that extend in the left-right direction in the axial direction. The rear edge 55 is a portion located behind the shaft 41 and is formed by stacking portions of the assumed wires 64 that extend in the left-right direction in the axial direction. The right edge 56 is a portion located to the right of the shaft 41 and is formed by stacking portions of the assumed wires 64 that extend in the front-rear direction in the axial direction. The left edge 57 is a portion located to the left of the shaft 41 and is formed by stacking portions of the assumed wires 64 that extend in the front-rear direction in the axial direction.

[0055] The folded portion 63 of the flat wire 60 constitutes the base end of a deemed wire 64. The folded portion 63 (base end of the deemed wire 64) is located at the lowest stage on the right end of the left edge 57. The deemed wire 64 extends spirally, repeating a path from the folded portion 63 (base end) through the left edge 57, the rear edge 55, the right edge 56, and the front edge 54, returning to the left edge 57.

[0056] The portions of the assumed wire 64 that form the rear edge 55, right edge 56, and left edge 57 are arranged horizontally in a front view and in a side view of the noise filter 2. The portion of the assumed wire 64 that forms the front edge 54 is inclined upward from the right end toward the left end in a front view. The portion of the assumed wire 64 that forms the front edge 54 is arranged to connect the front end of the right edge 56 to the front end of the left edge 57, which is one step higher than the right edge 56.

[0057] The first extending portion 61 is disposed around the entire circumference of the uppermost tier of the coil main body 52. ​​The portion of the assumed wire 64 (flat wire 60) that extends from the rear end of the left edge 57 of the uppermost first extending portion 61 is defined as a first connection terminal 58A. The first connection terminal 58A extends rearward in a straight line without bending from the rear end of the left edge 57 when viewed in the axial direction. The uppermost second extending portion 62 of the assumed wire 64 (flat wire 60) is disposed adjacent to and below the uppermost first extending portion 61. The portion of the assumed wire 64 that extends from the front end of the right edge 56 of the uppermost second extending portion 62 is defined as a second connection terminal 58B. The second connection terminal 58B extends forward in a straight line without bending from the front end of the right edge 56 when viewed in the axial direction.

[0058] In the axial direction of the core 40 and the coil main body 52 (edgewise coil 50), the first connection terminal 58A and the second connection terminal 58B are arranged at one end (upper end). When viewed in the axial direction, the first connection terminal 58A and the second connection terminal 58B are in a rotationally symmetrical positional relationship. A communication circuit (not shown) that is the target of noise suppression by the noise filter 2 is connected to the first connection terminal 58A and the second connection terminal 58B. One of the first connection terminal 58A and the second connection terminal 58B functions as an input terminal, and the other functions as an output terminal.

[0059] The noise filter 2 of the second embodiment includes a first edgewise coil 51A having a spiral first coil portion 53A and a second edgewise coil 51B having a second coil portion 53B arranged coaxially with the first coil portion 53A. The first edgewise coil 51A and the second edgewise coil 51B are formed from a single rectangular wire 60. The rectangular wire 60 has a folded portion 63 and a pair of extending portions (a first extending portion 61 and a second extending portion 62) extending from the folded portion 63 adjacent to and parallel to each other. The first extending portion 61 constitutes the first coil portion 53A, and the second extending portion 62 constitutes the second coil portion 53B.

[0060] In the second embodiment, the first and second extending portions 61 and 62 constituting the coaxially arranged first and second coil portions 53A and 53B are adjacent to and parallel to each other. Therefore, the first and second coil portions 53A and 53B function as a single coil main body 52 in which the first and second extending portions 61 and 62 are spirally wound as a single assumed wire 64. Because the assumed wire 64 is formed of a rectangular wire 60, the coil main body 52 has less dead space even if the cross-sectional area of ​​the assumed wire 64 is increased, compared to a coil made of a wire with a circular cross section. Therefore, according to the second embodiment, the shielding performance can be improved without increasing the dead space.

[0061] Since one assumed wire 64 has a divided structure consisting of two extending portions (first extending portion 61 and second extending portion 62), the process of forming the assumed wire 64 into a spiral can be performed separately on the first extending portion 61 and the second extending portion 62. The cross-sectional area of ​​the first extending portion 61 is smaller than that of one assumed wire 64, and the cross-sectional area of ​​the second extending portion 62 is smaller than that of the assumed wire 64. Therefore, compared to bending one rectangular wire having the same cross-sectional area as one assumed wire 64 into a spiral, the noise filter 2 shown in this embodiment 2 has an easier process of bending the flat wire 60 (first extending portion 61 and second extending portion 62) into a spiral.

[0062] The first edgewise coil 51A has a first connection terminal 58A that is continuous with the extending end of the first extending portion 61 and protrudes from the coil main body 52 (first coil portion 53A). The second edgewise coil 51B has a second connection terminal 58B that is continuous with the extending end of the second extending portion 62 and protrudes from the coil main body 52 (second coil portion 53B). The first connection terminal 58A and the second connection terminal 58B are continuous with a pair of extending portions (first extending portion 61 and second extending portion 62) that extend adjacent to and parallel to each other from the folded portion 63. This enables the first connection terminal 58A and the second connection terminal 58B to be disposed at one end (upper end) in the axial direction of the coil main body 52 (first coil portion 53A and second coil portion 53B).

[0063] The first connection terminal portion 58A and the second connection terminal portion 58B are arranged at positions that are rotationally symmetric when viewed in the axial direction of the coil main body portion 52 (the first coil portion 53A and the second coil portion 53B). With this configuration, the first connection terminal portion 58A and the second connection terminal portion 58B can be arranged at predetermined positions without considering the circumferential orientation of the first edgewise coil 51A and the second edgewise coil 51B.

[0064] The pair of extension portions includes a first extension portion 61 constituting the first coil portion 53A and a second extension portion 62 constituting the second coil portion 53B. The first extension portions 61 and the second extension portions 62 are alternately arranged in the axial direction of the coil main body portion 52 (the first coil portion 53A and the second coil portion 53B). With this configuration, when the coil main body portion 52 (the first coil portion 53A and the second coil portion 53B) is viewed in the axial direction, the projected area of ​​the coil main body portion 52 (the first coil portion 53A and the second coil portion 53B) can be reduced, thereby achieving space savings.

[0065] The noise filter 2 of the second embodiment includes a first edgewise coil 51A and a second edgewise coil 51B. The first edgewise coil 51A includes a first coil portion 53A and a first connection terminal portion 58A. The second edgewise coil 51B includes a second coil portion 53B and a second connection terminal portion 58B. The first edgewise coil 51A and the second edgewise coil 51B are formed using only a single rectangular wire 60. The first coil portion 53A and the second coil portion 53B are coaxially arranged and located in a common area in the axial direction (up and down). A first base end portion 59A of the first coil portion 53A in the axial direction and a second base end portion 59B of the second coil portion 53B in the axial direction are connected to each other. The first connection terminal portion 58A extends from the axial tip end (upper end) of the first coil portion 53A. The second connection terminal portion 58B extends from the tip portion (upper end portion) of the second coil portion 53B in the axial direction.

[0066] According to the noise filter 2 of the second embodiment, a double coil consisting of a first coil portion 53A and a second coil portion 53B connected to each other at their axial base ends (first base end 59A and second base end 59B) is formed by using a single flat wire 60. This makes it possible to arrange the first connection terminal portion 58A and the second connection terminal portion 58B, which are both ends of the flat wire 60, at the axial tip ends (one end) of the first coil portion 53A and the second coil portion 53B without extending the length of the flat wire 60 that constitutes the first edgewise coil 51A and the second edgewise coil 51B.

[0067] Because the thickness direction of the flat wire 60 of the first coil portion 53A and the second coil portion 53B is oriented in the axial direction, they can elastically deform individually, stretching in the axial direction. If the first coil portion 53A and the second coil portion 53B elastically deform in different ways, there is a concern that the magnetic field may become unstable. To address this issue, the first connection terminal portion 58A abuts against the second coil portion 53B in the axial direction, and the second connection terminal portion 58B abuts against the first coil portion 53A in the axial direction. This configuration prevents the first coil portion 53A and the second coil portion 53B from elastically deforming in different ways, thereby avoiding an unstable magnetic field.

[0068] Because the direction of the current flowing through the first coil portion 53A and the direction of the current flowing through the second coil portion 53B are opposite, the magnetic field generated by the current flowing through the first coil portion 53A and the magnetic field generated by the current flowing through the second coil portion 53B cancel each other out. Therefore, the current (signal) flowing through the coil main body 52 is less susceptible to the influence of noise from outside the noise filter 2.

[0069] [Other Examples] The present invention is not limited to the examples described above and illustrated in the drawings, but is defined by the claims. The present invention includes the meaning equivalent to the claims and all modifications within the scope of the claims, including the following embodiments.

[0070] In the first and second embodiments, the first connection terminal portion may be bent when viewed in the axial direction. In the first and second embodiments, the first and second connection terminals may be arranged at positions other than rotationally symmetrical. In the first and second embodiments, the first edgewise coil and the second edgewise coil may be relatively displaceable in the axial direction with respect to the core. In the first and second embodiments, the shape of the outer peripheral surface of the shaft portion, the shape of the first coil portion, and the shape of the second coil portion are not limited to a square, and may be a polygon other than a square, a trapezoid, a circle, or a shape including a curved surface. In the first and second embodiments, the noise filter may not have a core. In Examples 1 and 2, the shape of the outer surface of the core shaft portion, the shape of the first coil portion, and the shape of the second coil portion are not limited to a square, and may be a polygon other than a square, a trapezoid, a circle, or a shape including a curved surface. In the first embodiment, the protrusions may be provided on both of the pair of flanges (upper flange and lower flange). In the first embodiment, the lower flange portion may be sized to overlap only a portion (inner peripheral region) of the second coil portion when viewed in the axial direction. In Example 1, the upper flange portion may be large enough to overlap the entire first coil portion when viewed in the axial direction, or may be large enough to overlap the inner peripheral region of the second coil portion, or may be large enough to overlap the entire second coil portion. In the second embodiment, an upper flange portion may be provided at the upper end of the core so as to overlap the entire coil body or a part of the coil body in plan view. [Explanation of symbols]

[0071] 1...Noise filter 2...Noise filter 10...Core 11...Shaft 12...Upper flange portion (flange portion, one flange portion) 13...Lower flange portion (flange portion, lower flange portion) 14...Protrusion 20...Edgewise coil 21...Rectangular wire 22A...First edgewise coil 22B...Second edgewise coil 23A...First coil section 23B...Second coil section 24A...First leading edge 24B...Second leading edge 25A…1st trailing edge 25B…Second trailing edge 26A…1st right edge 26B…Second right edge 27A…1st left edge 27B…Second left edge 28A…First proximal end 28B…Second proximal end 29A...First connection terminal 29B...Second connection terminal 40...Core 41...Shaft 42...Flange 50...Edgewise coil 51A...First edgewise coil 51B...Second edgewise coil 52...Coil body 53A...First coil section 53B...Second coil section 54...leading edge 55... Trailing edge 56...Right edge 57...Left edge 58A...First connection terminal 58B...Second connection terminal 59A...First proximal end 59B…Second base end part 60...Rectangular wire 61...First extension portion (extension portion, one extension portion) 62...Second extension portion (extension portion, the other extension portion) 63…Folding part 64...Elemental wire

Claims

1. a first edgewise coil having a first coil portion and a first connection terminal portion; a second edgewise coil having a second coil portion and a second connection terminal portion, the first edgewise coil and the second edgewise coil are each formed of only one rectangular wire, the first coil portion and the second coil portion are arranged coaxially with each other and in a common region in the axial direction, a first base end portion of the first coil portion in the axial direction and a second base end portion of the second coil portion in the axial direction are connected to each other, the first connection terminal portion extends from a tip end portion of the first coil portion in the axial direction, The second connection terminal portion extends from the tip end of the second coil portion in the axial direction.

2. the first connection terminal abuts against the second coil portion in the axial direction; The noise filter according to claim 1 , wherein the second connection terminal abuts against the first coil portion in the axial direction.

3. The first coil portion is disposed radially inward, the second coil portion is disposed radially outward, 3. The noise filter according to claim 2, wherein the first connection terminal portion abuts against the second coil portion so as to cross the rectangular wire.

4. The first coil portion is disposed radially inward, the second coil portion is disposed radially outward, 4. The noise filter according to claim 2, wherein the second connection terminal portion is bent radially inward when viewed in the axial direction, and thereby abuts against the first coil portion.

5. 3. The noise filter according to claim 1, wherein the first connection terminal portion and the second connection terminal portion are arranged at positions that are rotationally symmetrical when viewed in the axial direction.

6. a core having a pair of flanges disposed at both axial ends of a shaft portion; the first coil portion and the second coil portion are arranged to coaxially surround the shaft portion, 4. The noise filter according to claim 1, wherein at least a portion of the first coil portion and the second coil portion overlaps with the pair of flange portions when viewed in the axial direction.

7. The noise filter according to claim 6 , wherein the flange portion has a protrusion that presses the first coil portion or the second coil portion in the axial direction.

8. The core is disposed with the axial direction directed in the up-down direction, The noise filter according to claim 6 , wherein the lower flange portion of the pair of flange portions has a size such that it overlaps entirely with the first coil portion and the second coil portion when viewed in the axial direction.

9. the first coil portion and the second coil portion are elastically deformable in a radial direction, The noise filter according to claim 6 , wherein at least one of the pair of flange portions is sized to overlap only an inner peripheral region of the first coil portion or the second coil portion when viewed in the axial direction.

10. The noise filter according to claim 6 , wherein the shaft portion, the first coil portion, and the second coil portion are non-circular when viewed in the axial direction.

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