Noise suppression components

Abstract

To provide a noise countermeasure member using a core case that can be applied to an annular magnetic body that does not have a shape for engaging with the core case.SOLUTION: A noise countermeasure member 100 used by inserting a cable includes an annular magnetic body that consists of a plurality of divided pieces 1 divided into non-annular shapes, and in which the divided surfaces 10 of the divided pieces 1 come into contact with each other to form an annular shape, and a plurality of core cases 5 each holding a divided piece 1, the inner circumferential surface 11, outer circumferential surface 12, and two axial end surfaces 13 of the annular magnetic body are each flat. Each of the plurality of core cases 5 includes an inner case 3 and an outer case 4 having a lock portion 44, and the inner case 3 is held inside the outer case 4. When the outer cases 4 are closed with the divided piece 1 held inside the inner case 3 and the inner case 3 held inside the outer case 4, the annular magnetic body has a ring shape in which the divided surfaces 10 of the plurality of divided pieces 1 are in contact with each other.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a noise countermeasure member.

Background Art

[0002] Conventionally, in order to reduce noise current propagating through a cable connected to an electronic device, a noise countermeasure member including an annular magnetic body and a core case for holding the annular magnetic body is known.

[0003] There is known a split-type noise countermeasure member including a pair of magnetic bodies (split pieces) each having a recess with a shape corresponding to the outer peripheral surface of an electric wire, and a pair of storage portions (core cases) for holding the magnetic bodies inside themselves, and the storage portions are combined so that the electric wire is held by each recess.

[0004] Patent Document 1 describes a split-type noise countermeasure member in which a groove is provided in a ferrite core and a protrusion engaging with the groove is provided in a core case so that the magnetic body does not fall off from the core case.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] When the core is formed of a magnetic body containing a nanocrystalline alloy, it may be difficult to provide irregularities such as grooves in the core and engage it with the core case as described in Patent Document 1.

[0007] An object of the present disclosure is to provide a noise countermeasure member using a core case applicable to an annular magnetic body having no shape for engaging with a core case.

Means for Solving the Problems

[0008] One aspect of this disclosure is as follows:

[0009] [1] A noise suppression member comprising an annular magnetic body consisting of a plurality of non-annularly divided segments, the segmented surfaces of which are brought into contact to form an annular shape, and a plurality of core cases that each hold one of the segments, and used by inserting a cable through it, The inner surface, outer surface, and two axial end faces of the aforementioned annular magnetic material are each flat. Each of the aforementioned multiple core cases includes an inner case and an outer case. The divided piece is held inside the inner case, and the inner case is held inside the outer case. The outer case has a locking mechanism that secures the outer cases together in a closed state. The annular magnetic material is a noise suppression member that holds the divided pieces inside the inner case, and when the outer cases are closed with the inner case held inside the outer case, the divided surfaces of the plurality of divided pieces come into contact with each other to form an annular shape.

[0010] [2] The noise suppression member according to [1], comprising a stacked soft magnetic metal thin strip.

[0011] [3] The noise suppression member according to [1] or [2], wherein the inner case includes an end face portion that covers one of the two end faces of the divided piece, an outer circumferential portion that covers the outer circumferential surface of the divided piece, and an inner circumferential portion that covers the inner circumferential surface of the divided piece.

[0012] [4] A noise suppression member according to any one of [1] to [3], wherein an elastic member is provided along the inside of the outer periphery of the inner case.

[0013] [5] The inner case holds the divided piece inside the inner case, and is held by the outer case with a movable range provided in the outer case so that it can move along the circumferential direction of the outer case when closing the outer cases while the inner case is held by the outer case. The noise countermeasure member according to any one of [1] to [4].

[0014] [6] The inner case has a first locking portion on its outer peripheral portion, and the outer case has a first locked portion corresponding to the position of the first locking portion. When the inner case is held inside the outer case, the first locking portion and the first locked portion engage with each other. The noise countermeasure member according to any one of [1] to [5].

[0015] [7] The inner case has a second locking portion on the end face portion in the axial direction, and the outer case has a second locked portion corresponding to the position of the second locking portion. When the inner case is held inside the outer case, the second locking portion and the second locked portion engage with each other. The noise countermeasure member according to any one of [1] to [6]. [Advantages of the Invention]

[0016] According to the present disclosure, it is possible to provide a noise countermeasure member using a core case that can be applied to an annular magnetic body that does not have a shape for engaging with the core case. [Brief Description of the Drawings]

[0017] [Figure 1] It is a figure which shows the state which decomposed | disassembled an example of the one side (division part) which divided the noise countermeasure member. [Figure 2] It is a figure which shows the state before attaching the division part shown in FIG. 1. [Figure 3] It is a figure which shows the noise countermeasure member formed by the division part shown in FIG. 1. [Figure 4]This is a diagram for explaining the movable range of the divided part shown in FIG. 1 by a cross-sectional view perpendicular to the central axis. [Figure 5] This is a diagram showing another example of a noise countermeasure member in a disassembled state. [Figure 6] This is a diagram showing the state before attaching the noise countermeasure member shown in FIG. 5. [Figure 7] This is a diagram showing the state after attaching the noise countermeasure member shown in FIG. 5. [Figure 8] This is a diagram showing another example of a noise countermeasure member in a disassembled state. [Figure 9] This is a diagram showing the state before attaching the noise countermeasure member shown in FIG. 8. [Figure 10] This is a diagram showing the state after attaching the noise countermeasure member shown in FIG. 8. [Figure 11] This is a diagram for explaining an example of an elastic member, where (a) shows the state before arranging the divided pieces, and (b) shows the state after arranging the divided pieces. [Figure 12] This is a diagram for explaining the hinge part of the inner case. (a) shows the state before arranging the divided pieces, (b) shows the state when the inner case is opened through the hinge part and the divided pieces are arranged, and (c) shows the state when the inner case is closed through the hinge part from the state of (b).

Embodiments for Carrying Out the Invention

[0018] Traditionally, it has been difficult to add noise suppression components after a power cable has been assembled. Therefore, it was necessary to either disassemble the power cable connector and insert the noise suppression component, or select a noise suppression component that could be physically inserted rather than electrically required, in order to allow the connector to pass through. To overcome this problem, a split-type ferrite core, which divides a ring-shaped ferrite core into semicircular sections, is commercially available, allowing the power cable to be directly sandwiched between them. The split-type ferrite core has a complex shape to improve the ease of attaching the noise suppression component and to ensure proper alignment of the divided sections when they come into contact. However, due to the splitting, the noise absorption performance is reduced compared to a ferrite core of the same size.

[0019] The inventors conceived of using a magnetic material containing a nanocrystalline alloy (nanocrystalline alloy core) as a magnetic material with a higher noise absorption effect than ferrite, in order to compensate for the decrease in noise absorption performance. However, the nanocrystalline alloy core is a difficult-to-machine material made by laminating brittle soft magnetic metal strips. Therefore, it is difficult to form the nanocrystalline alloy core into complex shapes, and there are limitations on the shape during molding. In addition, the dimensional tolerance of molded nanocrystalline alloy products is much larger than that of ferrite. Furthermore, if the laminated metal strips break, in some cases the entire broken layer may lose its function, and annular magnetic materials containing soft magnetic metal strips are not suitable for additional processing to create complex shapes. Moreover, if the dividing surfaces of the divided pieces are misaligned, it can cause a significant decrease in function.

[0020] As described in Patent Document 1 above, with ferrite cores, the core can be sintered during the molding process to a shape that engages with the protrusions of the core case. In contrast, nanocrystalline alloy cores are difficult to manufacture unless they have simple shapes such as circles, squares, or ellipses. For these reasons, it has been difficult to provide a segmented noise suppression member using nanocrystalline alloy cores.

[0021] The inventors conducted extensive independent research. They conceived that by making the core case a double structure including an inner case and an outer case, it is possible to accurately bring the divided surfaces of the divided pieces into contact with each other in a divided noise suppression member, even when using an annular magnetic material that does not have a shape for engaging with the core case. This led to the completion of this disclosure.

[0022] A noise suppression member according to one embodiment of this disclosure will be described below with reference to the drawings.

[0023] For example, as shown in Figures 1 to 3, a noise suppression member 100 according to one embodiment of the present disclosure comprises a plurality (two in this embodiment) of non-annularly divided segmented pieces 1, an annular magnetic body formed by bringing the segmented surfaces 10 of the segmented pieces 1 into contact with each other, and a plurality (two in this embodiment) of core cases 5 that each hold the segmented pieces 1, and is used by inserting a cable through it, wherein the inner circumferential surface 11, outer circumferential surface 12 and two axial end faces 13 of the annular magnetic body are each flat, and the plurality (two) of core cases 5 are each The noise suppression member 100 includes an inner case 3 and an outer case 4, wherein a divided piece 1 is held inside the inner case 3, the inner case 3 is held inside the outer case 4, and the outer case 4 has a locking part 44 that fixes the outer cases 4 together when closed, and the annular magnetic material holds the divided piece 1 inside the inner case 3, and the inner case 3 is held inside the outer case 4, and when the outer cases 4 are closed, the divided surfaces 10 of the plurality (two) divided pieces 1 come into contact with each other to form an annular shape. The specific configuration will be described below, but the noise suppression member 100 according to this embodiment is not limited to such a specific configuration. In this application, "inside" means the side approaching the annular magnetic material, and "outside" means the opposite, the side away from the annular magnetic material. Also, in this application, "divided" means having a divided shape, and is not intended to be limited to those formed by division by cutting or the like.

[0024] Figure 1 shows a disassembled state of a divided portion 100a, which is one side of an example of a noise suppression member 100. The noise suppression member 100 comprises an annular magnetic body consisting of two non-annularly divided divided pieces 1, and two core cases 5 that house each of the divided pieces 1. The two divided pieces 1 may be the same shape or may be different shapes. Similarly, the two core cases 5 may be the same shape or may be different shapes.

[0025] The annular magnetic material consists of two non-annularly divided segments 1. Each segment 1 has an inner circumferential surface 11, an outer circumferential surface 12, two end faces (upper and lower surfaces in the direction of the central axis of the annular magnetic material) 13 in the axial direction (also called the central axis direction) along the central axis O (see Figure 4) of the annular magnetic material, and a dividing surface 10. When the outer cases 4 are closed, the dividing surfaces 10 of the two segments 1 come into contact with each other, forming an annular shape. A hollow portion 6 (see Figure 4) is then formed radially inward between the two inner circumferential surfaces 11 through which a cable is inserted.

[0026] The two core cases 5 each include an inner case 3 and an outer case 4. As shown in Figure 1, the inner case 3 includes an end face portion 33 that covers one of the two end faces 13 of the segmented piece 1 of the annular magnetic material, an outer peripheral portion 32 that covers the outer peripheral surface 12, and an inner peripheral portion 31 that covers the inner peripheral surface 11. The inner peripheral portion 31, outer peripheral portion 32, and end face portion 33 may each have one or more through holes. The inner peripheral portion 31, outer peripheral portion 32, and end face portion 33 may not each completely cover the inner peripheral surface 11, outer peripheral surface 12, and end face 13 of the segmented piece 1. Furthermore, the areas of the inner peripheral portion 31, outer peripheral portion 32, and end face portion 33 do not need to match the areas of the inner peripheral surface 11, outer peripheral surface 12, and end face 13. In addition, an elastic member 2 is provided along the inside of the outer peripheral portion 32 of the inner case 3. In this way, the inner case 3 includes an end face portion 33 that covers one of the end faces 13 of the segmented piece 1 of the annular magnetic material, an outer peripheral portion 32 that covers the outer peripheral surface 12, and an inner peripheral portion 31 that covers the inner peripheral surface 11. This prevents cracks or chips from occurring in the segmented piece 1, even if the segmented piece 1 includes a thin strip of soft magnetic metal.

[0027] Preferably, the inner case 3 has an end face portion 33 that covers one of the two end faces 13 of the divided piece 1, but does not have a member that covers the other end face 13. By not having a member that covers the other end face 13, the divided piece 3 can be inserted into the inner case 3 from the axial direction. The divided piece 1, which includes a thin strip of soft magnetic metal, has lower strength compared to ferrite, and when held in the inner case 3, if stress is applied in a direction that is weak in strength, for example, if the divided piece 1 is semicircular in shape, stress in the direction radiating from the central axis O of the annular magnetic material may cause it to lose its shape.

[0028] The elastic member 2 is provided along the inside of the outer circumference 32 of the inner case 3, allowing the segmented piece 1 to be held inside the inner case 3 by elastic force. This prevents the segmented piece 1 from moving in the radial direction (direction perpendicular to the central axis O) and axial direction of the annular magnetic material inside the inner case 3 when the noise suppression member 100 is inserted into the cable, and allows the segmented surfaces 10 of the segmented piece 1 to come into suitable contact with each other. The elastic member 2 is not particularly limited as long as it is an elastic material, but may be, for example, an elastic urethane foam, acrylic foam, resin spring, metal spring, etc. The elastic member 2 may have removable adhesive force. Having removable adhesive force allows the segmented piece 1 to be held more suitablely inside the inner case 3. The resin spring may also be integrally molded with the inner case 3. In one example, the elastic member 2 may be the resin spring 20 shown in Figure 11. As shown in Figure 11, when the divided piece 1 is stored inside the inner case 3, the elastic member 2 (20) is provided along the inside of the outer circumference 32 of the inner case 3. This elastic member 2 applies stress to the divided piece 1 toward the inner circumference 31 of the inner case 3. This stress presses the divided piece 1 toward the inner circumference 31 of the inner case 3. This holds the divided piece 1 inside the inner case 3, and when the outer cases 4 are closed with the inner case 3 held inside the outer case 4, the divided surfaces 10 of the two divided pieces 1 can be brought into suitable contact inside the core case 5. The elastic member 2 also plays a role in distributing the stress when the outer case 4 is closed. This prevents excessive stress from being applied to the divided piece 1 due to the load generated when the outer case 4 is attached, and prevents the divided piece 1 from being damaged. The divided piece 1 may also be fixed to the inside of the inner case 3 with an adhesive or the like.

[0029] If the elastic member 2 has adhesive properties, as shown in Figure 12, a second hinge portion 8 may be provided on the inner case 3 so that it can be opened and closed using the second hinge portion 8 as an axis. By providing the inner case 3 with a second hinge portion 8 so that it can be opened and closed, the elastic member 2 with adhesive properties can be attached to the divided piece 1 after inserting the divided piece 1 into the inner case 3 and aligning its position, thereby improving the ease of attaching the divided piece 1.

[0030] As shown in Figure 1, the inner case 3 may have stepped portions 36, 37 at either one or both ends of its outer circumference 32 and inner circumference 31, and when the outer case 4 is closed, the stepped portions 36, 37 of the two inner cases 3 may be formed to face each other alternately. In the example in Figure 1, the inner case 3 has first stepped portions 36a, 36b at both ends of its outer circumference 32 and second stepped portions 37a, 37b at both ends of its inner circumference 31.

[0031] A protective material (cushioning material) may be provided between the inner circumference 31 of the inner case 3 and the divided piece 1. Providing a protective material can more effectively prevent damage to the divided piece 1 when it is pressed against the inner circumference 31 by the elastic member 2.

[0032] The inner case 3 is held inside the outer case 4. The outer case 4 has a top surface 41, an outer peripheral surface 42, and a bottom surface 43. The outer peripheral surface 42 covers the outer peripheral surface 32 of the inner case 3 of the divided piece 1. The bottom surface 43 covers the end surface 33 of the inner case 3 while the inner case 3 is held inside the outer case 4. The top surface 41 covers the end surface 13 of the divided piece 1 held inside the inner case 3 while the inner case 3 is held inside the outer case 4.

[0033] Furthermore, as shown in Figure 5, the outer case 4 may have a connecting portion 7 that connects two outer cases 4 so that they can be opened and closed. In one example, the connecting portion 7 may be a hinge portion. By making the connecting portion 7 a hinge portion, the two outer cases 4 can be connected so that they can be opened and closed with the hinge portion as an axis.

[0034] The two outer cases 4 may have a locking portion 44 that secures the two outer cases 4 together in a closed state, as shown in Figure 3. The shape of the locking portion 44 is not particularly limited and may be a snap-fit ​​type, catch-lock type, bolt type, etc. In the example in Figure 3, a hook receiving portion 44a is provided on one outer case 4, and a hook portion 44b that can be engaged with the hook receiving portion 44a is provided on the other outer case 4 at a position corresponding to the hook receiving portion 44a. The locking portion 44 prevents the noise suppression member 100 attached to the cable from coming off.

[0035] As shown in Figure 1, the inner case 3 may have a first locking portion 34 (two protrusions 34a in the illustrated example) on its outer circumference 32, and the outer case 4 may have a first locked portion 45 (two holes 45a in the illustrated example) corresponding to the position of the first locking portion 34. The shape and number of the first locking portion 34 and the first locked portion 45 are not particularly limited. In the example of Figure 1, the first locking portion 34 is a protrusion provided along the height direction of the outer circumference 32. The protrusion may be provided on the outside of the outer circumference 32. Also in the example of Figure 1, the first locked portion 45 is a hole provided on the upper surface portion 41 at a position corresponding to the first locking portion 34. The first locked portion 45 is not limited to a through hole but may also be a recess. Furthermore, the convex and concave shapes of the first locking portion 34 and the first locked portion 45 may be reversed. In other words, the outer case 4 may have a locking portion and the inner case 3 may have a locked portion. Alternatively, the inner case 3 may not have a locking portion, and the outer case 4 may be directly hooked onto the divided piece 1 or the inner case 3 to hold it in place. The shape of the projection is not limited to a square shape, but may be spherical, round, snap-fit, etc. When the inner case 3 is housed in the outer case 4, the first locking portion 34 locks onto the first locking portion 45. This effectively prevents the inner case 3 from coming off the outer case 4. In addition, a similar locking portion may be provided on the inner circumference 31 of the inner case 3, and a locking portion corresponding to the position of the locking portion may be provided on the outer case 4.

[0036] Furthermore, as shown in Figure 1, the inner case 3 may have a second locking portion 35 on its end face 33, and the outer case 4 may have a second locked portion 46 corresponding to the position of the second locking portion 35. The shape and number of the second locking portion 35 and the second locked portion 46 are not particularly limited. In the example in Figure 1, the second locking portion 35 is a projection provided on the outside of the end face 33. Also in the example in Figure 1, the second locked portion 46 is a hole (recess) provided at a position corresponding to the second locking portion 35. Note that the hole may be a through hole instead of a recess. The second locking portion 35 and the second locked portion 46 may have opposite orientations. In other words, the outer case 4 may have a locking portion and the inner case 3 may have a locked portion. Note that the inner case 3 may not have a locked portion, and the inner case 3 may be directly hooked onto the locking portion of the outer case 4 to hold it. The second locking portion 35 and the second locked portion 46 effectively prevent the inner case 3 from detaching from the outer case 4.

[0037] The inner case 3 holds the divided piece 1 inside the inner case 3, and the inner case 3 is held in the outer case 4. When the outer cases 4 are closed together, the inner case 3 is held in the outer case 4 and is held in the outer case 4 with a range of motion so that it can move along the circumferential direction of the outer case 4 (the direction around the central axis O). As shown in Figure 4, the inner diameter of the outer peripheral surface portion 42 of the outer case 4 and the outer diameter of the outer peripheral portion 32 of the inner case 3 may be approximately the same. The inner case 3 and the divided piece 1 held inside the inner case 3 can rotate along the circumferential direction of the outer case 4 even when the outer cases 4 are closed together. With the above range of motion, when the outer cases 4 are closed, the divided piece 1 begins to come into contact with each other and at the same time the inner case 3 rotates circumferentially within the outer case 4. This rotation can absorb assembly errors when assembling the divided piece 1 to the inner case 3 and manufacturing errors of the divided piece 1, and can reduce poor contact between the divided piece 1. Furthermore, when assembling the outer cases 4 together, the stress on the divided piece 1 can be distributed by rotation.

[0038] The range of motion can be adjusted as appropriate according to the size of the segmented piece 1. In the example in Figure 1, the range of motion is formed by the overall circumferential play (dimensional margin that allows relative movement when engaged) of the first locking portion 34 and the second locking portion 35 relative to the first locking portion 45 and the second locking portion 46. In one example, the range of motion may be greater than 0° and within 20° in the circumferential direction. Preferably, it is greater than 1° and within 10°, and more preferably greater than 2° and within 8°.

[0039] On the other hand, when the outer cases 4 are closed together, it is preferable that the inner case 3 and the segmented piece 1 (annular magnetic material) held inside the inner case 3 do not move in the radial direction and the central axis direction of the annular magnetic material. This configuration effectively prevents the segmented surface 10 of the segmented piece 1 from shifting when the outer cases 4 are closed together.

[0040] The material of the core case 5 is not particularly limited. For example, polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyamide (PA), polyphenylene sulfide (PPS), silicone resin, silicone elastomer, etc. can be used. Furthermore, materials that improve strength and heat resistance by incorporating glass fiber (GF), carbon fiber (CF), graphite (GP), etc. into the thermoplastic can also be used. In addition, it can be integrated with metal or ceramic materials by insert molding, etc. If the shape of the annular magnetic body is, for example, circular, square, or elliptical, the inner case 3 and outer case 4 may be shaped to conform to those shapes.

[0041] Because the core case 5 is a split type, it is easy to attach and detach cables, and the noise suppression member 100 can be added and removed even when cables are connected. Therefore, the noise attenuation can be adjusted by attaching and detaching the noise suppression member 100 even while using electronic equipment.

[0042] Next, the segmented pieces 1 of the annular magnetic material housed in the core case 5 will be described. The annular magnetic material has an overall annular shape and includes stacked soft magnetic metal strips. The annular magnetic material consists of multiple segmented pieces 1 that are divided into annular shapes. In the example in Figure 1, the annular magnetic material, which has an overall annular shape, is cut in half along the central axis direction to form segmented pieces 1. The segmented surfaces 10 of two segmented pieces 1 are brought into contact with each other to form an annular shape, and a cable is inserted through the hollow portion 6 partitioned by the annular magnetic material for use.

[0043] The segmented piece 1 has a flat inner circumferential surface 11, an outer circumferential surface 12, and two end faces 13, and does not have a shape for engaging with the core case 5. However, in this noise suppression member 100, the core case 5 has a double structure consisting of an inner case 3 and an outer case 4, which allows such a segmented piece 1 to be suitably held inside the core case 5. Therefore, even when using a magnetic material including a highly brittle soft magnetic metal thin strip, the segmented surfaces 10 of the segmented piece 1 can be brought into contact with each other with high precision in the segmented noise suppression member 100. Here, the statement that the inner circumferential surface 11, the outer circumferential surface 12, and the two end faces 13 are all flat and that the segmented piece 1 does not have a shape for engaging with the core case 5 means that the segmented piece 1 does not have an uneven structure on each of its inner circumferential surface 11, outer circumferential surface 12, and two end faces 13 that would engage with the core case 5. Furthermore, as long as the segmented piece 1 does not have a shape for engaging with the core case 5, the segmented piece 1 is not limited to magnetic materials including soft magnetic metal strips, but can also be applied to ferrite cores, powder cores, and the like.

[0044] The annular magnetic material may be divided in any way as long as the overall shape of the divided piece 1 is non-annular. In one example, the annular magnetic material (divided piece 1) has a dividing surface 10 parallel to the central axis direction and the radial direction. The annular magnetic material (divided piece 1) may also have a dividing surface 10 that is inclined with respect to at least one of the central axis direction and the radial direction. Figures 1 to 12 show an example of a straight type in which the dividing surface 10 is parallel to the central axis direction and the radial direction. Furthermore, the shape of the dividing surface 10 of the divided piece 1 is not limited to a plane.

[0045] Examples of soft magnetic materials that can be used include ferrites such as Mn-Zn ferrite, Ni-Zn ferrite, and Ni-Zn-Cu ferrite; soft magnetic metals such as Fe-Ni alloys (permalloy) and Fe-Si alloys (silicon steel); amorphous alloys such as Co-based amorphous alloys and Fe-based amorphous alloys; and soft magnetic metals such as Fe-based nanocrystalline alloys. Among these, Fe-based nanocrystalline alloys are preferred.

[0046] The annular magnetic material may have a resin coating around its periphery or may be wrapped with insulating tape. The layers of the soft magnetic metal strips of the annular magnetic material may be impregnated with resin or inorganic material. An annular magnetic material containing laminated soft magnetic metal strips is manufactured, for example, by winding the strips into a cylindrical shape. Resin impregnation can increase the compression strength of the annular magnetic material. Epoxy resins, acrylic resins, or mixtures thereof are preferred as the resin coating agent or resin impregnation agent.

[0047] The overall shape of an annular magnetic material is not particularly limited as long as it is annular. Besides being a true cylindrical shape (the outer shape of the cross section perpendicular to the central axis is a true circular annular shape) as shown in Figure 1, an annular magnetic material can also be, for example, an elliptical cylinder (the shape of the cross section perpendicular to the central axis is an elliptical annular shape), a square cylinder (the shape of the cross section perpendicular to the central axis is a square annular shape), or a rounded square cylinder (the shape of the cross section perpendicular to the central axis is a rounded square annular shape). The shape of the divided piece 1 is determined by the overall shape of the annular magnetic material and the manner of division. For example, if the overall shape of the annular magnetic material is a true cylindrical or elliptical cylinder, and the annular magnetic material is divided in half symmetrically along the central axis, the shape of the divided piece 1 may be an arc shape. If the overall shape of the annular magnetic material is a rounded square cylinder, and the annular magnetic material is divided in half symmetrically along the central axis, the shape of the divided piece 1 may be U-shaped, U-shaped, or linear, depending on the overall shape of the annular magnetic material.

[0048] The divided surface 10 may have a protective coating such as a rust inhibitor or a film sheet. Furthermore, the outer peripheral edge of the divided surface 10 of the annular magnetic material and the continuous surfaces (inner peripheral surface 11, outer peripheral surface 12, and the two end faces 13) may be protected by a resin coating or tape. The outer peripheral edge of the divided surface 10 may be chamfered.

[0049] The following describes examples of the present disclosure, but the present disclosure is not limited to these examples. [Examples]

[0050] (Example 1) Example 1 will be explained using Figures 1-3. A divided piece 1 was prepared, which is a cylinder divided into two by a dividing surface 10 parallel to the central axis direction and the radial direction. An inner case 3 was also prepared, which includes an end surface portion 33 that covers one of the end surfaces 13 of the divided piece 1 of the annular magnetic material, an outer peripheral portion 32 that covers the outer peripheral surface 12, and an inner peripheral portion 31 that covers the inner peripheral surface 11. The divided piece 1 was held in the inner case 3 with double-sided tape 2 made of cushioning urethane material. The inner cases 3 were inserted into the outer case 4, and the state in which the dividing surface 10 of the divided piece 1 is exposed is considered the state before installation (Figure 2). Two divided portions 100a of the noise suppression member in the state before installation shown in Figure 2 were prepared, and the state in which both ends of the outer case 4 were fixed using snap-fit ​​type locking parts 44 is considered the closed state (locked) (Figure 3). In the closed state, the dividing surfaces 10 of the two divided pieces 1 come into contact with each other, forming an annular magnetic material.

[0051] When the outer case 4 is closed, the hollow section 6 partitioned by the inner circumference 31 of the inner case 3 becomes a cable insertion passage. When using the device, the case is closed so that the cables are sandwiched inside the insertion passage.

[0052] (Example 2) Embodiment 2 will be described using Figures 5-7. A divided piece 1 was prepared, which is shaped by dividing a cylinder into two by a dividing surface 10 parallel to the central axis direction and the radial direction. An inner case 3 was also prepared, which includes an end surface portion 33 that covers one of the end surfaces 13 of the divided piece 1 of the annular magnetic material, an outer peripheral portion 32 that covers the outer peripheral surface 12, and an inner peripheral portion 31 that covers the inner peripheral surface 11. The inner case 3 has elastic urethane double-sided tape 2 on the inside of the outer peripheral portion 32. Two core units were prepared, each holding a divided piece 1 inside the inner case 3. The core units were inserted into an outer case 4 which has a top surface portion 41, an outer peripheral surface portion 42, and a bottom surface portion 43, and the two outer cases 4 are connected by a hinge portion 7, so that the divided surface 10 is exposed and the outer case 4 is open, which is the state before installation (Figure 6). The outer case 4 is folded in half around the hinge portion 7, and the ends of the outer case 4 are fixed using snap-fit ​​type locking portions 44 to form the closed state (locked) (Figure 7). In the closed state, the dividing surfaces 10 of the two divided pieces 1 come into contact with each other, forming an annular magnetic body.

[0053] (Example 3) Embodiment 3 will be described using Figures 8 to 11. A divided piece 1 was prepared, which is shaped like a rounded rectangular tube divided into two by a dividing surface 10 parallel to the central axis direction and the radial direction. An inner case 3 was also prepared, which includes an end face portion 33 that covers one of the end faces 13 of the divided piece 1 of the annular magnetic material, an outer periphery portion 32 that covers the outer periphery surface 12, and an inner periphery portion 31 that covers the inner periphery surface 11. The inner case 3 is made of an elastic resin material and has a resin spring 20 inside the outer periphery portion 32 that presses the divided piece 1 in the direction of the inner periphery portion 31. When the divided piece 1 is held in the inner case 3, it looks like Figure 11. Two core units were prepared, each holding the divided piece 1 inside the inner case 3. The core units were inserted into an outer case 4 which has a top surface portion 41, an outer periphery surface portion 42, and a bottom surface portion 43, and the two outer cases 4 are connected by a hinge portion 7. The state before installation is when the dividing surface 10 is exposed and the outer case 4 is open (Figure 9). The outer case 4 is folded in half around the hinge portion 7, and the ends of the outer case 4 are fixed using snap-fit ​​type locking portions 44 to form the closed state (locked) (Figure 10). In the closed state, the dividing surfaces 10 of the two divided pieces 1 come into contact with each other, forming an annular magnetic body. [Industrial applicability]

[0054] This noise suppression component is particularly effective as a noise suppression component that is attached to cables of electronic components, power generators, power supply units, communication equipment, and OA / FA equipment installed in automobiles, suppressing noise generated inside or outside these electronic components and equipment and propagating through the cables. Furthermore, the configuration of this noise suppression component can also be applied to inductors and current transformers mounted on circuit boards, and is not limited to applications attached to cables. In addition, the configuration of this noise suppression component can be applied even when the divided piece is divided into two or more pieces. [Explanation of symbols]

[0055] 100 Noise suppression components 100a split part 1 piece 10 split plane 11 Inner surface 12 Outer surface 13 End face 2 Elastic members 20 Resin springs 3. Inner Case 31 Inner circumference 32 Outer periphery 33 End section 34 First locking part 34a protrusion 35 Second locking part 36(36a,36b) First step part 37(37a,37b) Second step part 4 Outer Cases 41 Top part 42 Outer peripheral surface section 43 Bottom part 44 Lock section 44a Hook receiving part 44b Hook section 45 First locked part 45a Hole 46 Second locked part 5 Core Case 6 Hollow part 7 Connecting part 8. Second hinge section O center axis

Claims

1. A noise suppression member comprising an annular magnetic body consisting of a plurality of non-annularly divided segments, the segmented surfaces of which are brought into contact to form an annular shape, and a plurality of core cases that each hold one of the segments, and used by inserting a cable through it, The inner surface, outer surface, and two axial end faces of the aforementioned annular magnetic material are each flat. Each of the aforementioned multiple core cases includes an inner case and an outer case. The divided piece is held inside the inner case, and the inner case is held inside the outer case. The outer case has a locking mechanism that secures the outer cases together in a closed state. The annular magnetic material is a noise suppression member that holds the divided pieces inside the inner case, and when the outer cases are closed with the inner case held inside the outer case, the divided surfaces of the plurality of divided pieces come into contact with each other to form an annular shape.

2. The noise suppression member according to claim 1, wherein the annular magnetic material includes stacked soft magnetic metal thin strips.

3. The noise suppression member according to claim 1 or 2, wherein the inner case includes an end face portion that covers one of the two end faces of the divided piece, an outer circumferential portion that covers the outer circumferential surface of the divided piece, and an inner circumferential portion that covers the inner circumferential surface of the divided piece.

4. The noise suppression member according to claim 3, wherein an elastic member is provided along the inside of the outer periphery of the inner case.

5. The noise suppression member according to claim 1 or 2, wherein the inner case holds the divided piece inside the inner case, and the outer case is held in a position where it can move along the circumferential direction of the outer case when the outer cases are closed together, the inner case is held in a position where it is held in the outer case, and the outer case is held in a position where it is held in the outer case, thereby providing the outer case with a range of motion.

6. The inner case has a first locking portion on its outer circumference, and the outer case has a first locked portion corresponding to the position of the first locking portion. The noise suppression member according to claim 1 or 2, wherein when the inner case is held inside the outer case, the first locking portion and the first locked portion engage with each other.

7. The inner case has a second locking portion at the axial end face, and the outer case has a second locked portion corresponding to the position of the second locking portion. The noise suppression member according to claim 6, wherein when the inner case is held inside the outer case, the second locking portion and the second locked portion engage with each other.

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