JPH07230915A - Noise absorber - Google Patents

Abstract

PURPOSE:To provide a noise absorber constituted so that holding cases for holding magnetic substances individually can be connected in line as many as needed. CONSTITUTION:The front-end protrusion of an outer case 2B and a groovelike recession 2c of an inner case 2A in whose keeping part 13 a magnetic substance 10 is being kept are coupled by press-fitting the cylindrical part of the inner case 2A to the front space of the outer case 2B, and the said magnetic substance 10 is fixed to a holding case 2 and a set of noise absorbers 11 is formed. Besides, a rear-end protrusion 2g stretching slightly toward the radial-direction inside is provided circumferentially on the inner circumferential surface of the rear end surface of the cylindrical part of the outer case 2B. Accordingly, to the rear part of the outer case 2B of one holding case 2, the front part of the inner case 2A of another holding case 2 is made connectable by inserting a linking part C formed by the disc part and the circumferential part of the other inner case 2A, into a linking part D formed by the rear inner surface, disc part and rear end protrusion 2g of the cylindrical part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention inserts a magnetic field or an electromagnetic wave generated inside an electronic device or a magnetic field or an electromagnetic wave generated outside and flows into an electronic device through an electric wire into the electric wire of the electronic device. The present invention relates to a noise absorber designed to be absorbed by a magnetic material.

[0002]

2. Description of the Related Art In recent years, OA devices incorporating ICs and microcomputers and various other electronic devices have become widespread. However, electromagnetic waves generated from these electronic devices may interfere with nearby electronic devices.
The point of giving MI) has become a big problem. Conventionally, the amount of current flowing in the connection cable between boards in electronic devices and the interface cable that connects computers and peripheral devices, etc. There is used a noise absorber that surrounds the outer peripheral portion of a magnetic material such as ferrite and absorbs magnetic fields and electromagnetic waves by the magnetic material. As this type of noise absorber, a donut-shaped magnetic body formed around a through hole for inserting an electric wire or a donut-shaped magnetic body formed by abutting two arc-shaped segments to each other is made of synthetic resin. It is generally known that it is housed in a case.

[0003]

Ferrite, which is a typical magnetic material, has different magnetic permeability depending on its material, and also has different frequency band for causing its attenuation. Therefore, if the same material is used, the noise absorption capacity is proportional to the length and the cross-sectional area divided by the magnetic path length. Therefore, in order to obtain a large noise absorption effect, it is sufficient to use a magnetic body having a larger outer diameter than the inner diameter of the through hole or a long magnetic material. Therefore, at present, even magnetic materials made of the same material and having the same inner diameter are prepared with various outer diameters and various total lengths, and the magnetic material to be used according to the frequency band to be attenuated and the desired attenuation amount. Techniques have been taken to determine the size of and obtain the damping effect. However, this method has a problem that it is necessary to prepare magnetic bodies of various sizes with the same material.

Further, as described above, since the frequency band that ferrite can absorb is limited depending on the material, it is recommended to install ferrite cores made of different materials in series in order to obtain an effect over a wide band. However, the conventional ferrite core housing case is used only for the purpose of housing and protecting the core inside, and is not structured to connect these cases to each other. Therefore, when a plurality of cores are continuously mounted in the axial direction, it is common to bond the cases with an adhesive, but this is extremely complicated and involves a labor-intensive work.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above-mentioned problems inherent in the prior art, and provides means for easily connecting an arbitrary number of magnetic material holding cases. With the goal.

[0006]

[Means for Solving the Problems]
In order to preferably achieve the intended purpose, the noise absorber according to the present invention comprises a holding case provided with a cylindrical magnetic body housing having an insertion hole in the central axial direction, and the insertion hole for the magnetic body. In a noise absorber designed to absorb an electromagnetic wave generated from an electric wire inserted through the magnetic body by a magnetic body, an engaging portion and an engaging portion are correspondingly provided at a front portion and a rear portion in the axial direction of the holding case, respectively. By engaging an engaging part provided on the rear part of the holding case with an engaging part provided on the front part of the other holding case, the required number of holding cases containing the magnetic bodies are connected in an aligned manner. It is characterized by being configured as possible.

In order to solve the above-mentioned problems and preferably achieve the intended purpose, the noise absorber according to the present invention is provided with a holding portion provided with a cylindrical magnetic body containing portion having an insertion hole in the central axial direction. A noise absorber comprising a case, wherein electromagnetic waves generated by an electric wire inserted through an insertion hole of the magnetic body is absorbed by the magnetic body, wherein a joining member is provided on each of a front end face and a rear end face in the axial direction of the holding case. Arranged,
By joining a joining member provided at the rear part of one holding case and a joining member provided at the front part of the other holding case, the required number of holding cases containing the magnetic bodies can be aligned and connected. It is characterized in that it is configured in.

In order to solve the above problems and preferably achieve the intended purpose, the noise absorber according to the present invention is provided with a holding portion provided with a cylindrical magnetic body containing portion having an insertion hole in the central axial direction. In a noise absorber which is made of a case, and which absorbs electromagnetic waves generated by an electric wire inserted through an insertion hole of the magnetic body by the magnetic body, a protruding piece having an enlarged tip portion is provided upright on the outer peripheral surface of the holding case. At the same time, a strip-shaped plate member sequentially provided with through holes corresponding to the distance between the protrusions generated when these holding cases are axially aligned is provided as a separate body, and the holding cases are axially aligned. By inserting the protrusion pieces into the through holes of the strip-shaped plate member in this state, a required number of holding cases individually accommodating the magnetic bodies can be connected in an aligned manner.

In order to solve the above problems and preferably achieve the intended purpose, the noise absorber according to the present invention has a required length having an outer diameter which can be inserted into the central insertion hole of the cylindrical magnetic body. A hollow bolt, a nut formed with a female screw that can be screwed into a male screw of the hollow bolt, a flange provided at the other end of the hollow bolt to prevent the magnetic body from falling off, and an axial direction of the hollow bolt. Formed of a hollow portion that allows the insertion of an electric wire that should absorb electromagnetic waves, and with the hollow bolt inserted in a required number of magnetic bodies, by screwing the nut onto the hollow bolt, The feature is that a required number of magnetic bodies can be connected in an array.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a noise absorber according to the present invention will be described below with reference to the accompanying drawings with reference to preferred embodiments. FIG. 1 is a partial cross-sectional perspective view showing a state in which four sets of noise absorbers 11 according to a first embodiment of the present invention are axially connected and attached to an electric wire 12, and FIG. FIG. 3 is a perspective view showing the set of noise absorbers 11 in a disassembled state.
It is sectional drawing of the noise absorption tool 11 of a group. The noise absorber 11 of the first embodiment includes a magnetic body 10 such as a tubular ferrite having an insertion hole 10a for allowing the electric wire 12 to be inserted,
A holding case 2 for accommodating the magnetic body 10 therein is provided, and each holding case 2 is made up of an inner case 2A and an outer case 2B as shown in FIG. As the material of the holding case 2, an elastically deformable synthetic resin (for example, nylon, polyethylene, etc.) is preferably used.

As shown in FIGS. 2 and 3, the inner case 2A comprises a cylindrical portion 2a and a disc portion 2b formed at one axial end portion thereof, and an electric wire is provided at the center of the disc portion 2b. A circular through hole 2h through which 12 is inserted is opened. The other end of the cylindrical portion 2a in the axial direction is entirely opened, and the inner space defined by the inner peripheral surface of the cylinder and the disc portion 2b functions as a storage portion 13 for the magnetic body 10. Further, on the outer peripheral surface of the cylindrical portion 2a on the side where the disk portion 2b is formed, there is provided a groove-like recess 2c around which a front end convex portion 2f and a rear end convex portion 2g of an outer case 2B described later are detachably fitted. It is set up.

As shown in FIGS. 2 and 3, the outer case 2B is composed of a cylindrical portion 2d and a disc portion 2e provided inward in the radial direction at a position recessed by a required distance. A through hole 2i is formed in the center of 2e to allow the electric wire 12 to be inserted therethrough. For convenience of explanation, the portion on the left side of the disc portion 2e in FIG. 3 is called the front portion, and the portion on the right side is called the rear portion. A front end convex portion 2f slightly extending inward in the radial direction is provided around the inner peripheral surface of the front portion of the cylindrical portion 2d, and is defined by the front portion of the cylindrical portion 2d and the disc portion 2e. In the inner space, the cylindrical portion 2 of the inner case 2A
One holding case 2 is formed by inserting a.
At this time, the front end convex portion 2f of the outer case 2B is closely fitted to the outer peripheral concave portion 2c of the inner case 2A, and the inner peripheral surface of the cylindrical portion 2a of the inner case 2A, the disc portion 2b, and the circle of the outer case 2B. The magnetic body 10 is stored in the storage portion 13 defined by the plate portion 2e.

Further, the cylindrical portion 2 in the outer case 2B
On the inner peripheral surface of the rear end surface of d, there is provided a rear end convex portion 2g that slightly extends inward in the radial direction. Therefore, by the rear inner surface of the cylindrical portion 2d, the disc portion 2e and the rear end convex portion 2g. By inserting the engaging portion C formed by the disc portion 2b and the circumferential portion 2a of the other inner case 2A into the formed engaging portion D, the outer case 2B of the one holding case 2 is provided with a rear portion. The inner case 2A of the other holding case 2 can be connected.

[0014]

Operation of the Embodiment The operation of the noise absorber 11 according to the first embodiment described above will be described below. As shown in FIG. 3, when the cylindrical portion 2a of the inner case 2A in which the magnetic body 10 is stored in the storage portion 13 is press-fitted into the front space of the outer case 2B, the groove-shaped recess 2c of the inner case 2A and the outer case 2B are separated. The front end convex portion 2f is fitted. Further, since the outer peripheral surface of the cylindrical portion 2a of the inner case 2A and the inner peripheral surface of the cylindrical portion 2d of the outer case 2B are molded so as to be completely in close contact with each other, the inner case 2A and the outer case 2 are formed.
B is joined without play in the radial direction and the axial direction.
The magnetic body 10 stored in the storage portion 13 has an outer peripheral surface in contact with the inner peripheral portion of the cylindrical portion 2a of the inner case 2A, and both end surfaces of the magnetic body 10 on the disc portion 2b of the inner case 2A and the disc portion 2e of the outer case 2B. Since they are in contact with each other, the magnetic body 10 is fixed to the holding case 2 to form a pair of noise absorbers 11.

When using two or more sets of the noise absorbers 11 constructed as described above, the holding cases 2 of these noise absorbers 11 are connected in series in the axial direction to form the electric wire 1.
Attach to 2. That is, as shown in FIGS. 1 and 3, the engaging portion C of the holding case 2 of the noise absorbing tool 11 is engaged with the engaging portion D of the holding case 2 of another noise absorbing tool 11, thereby holding the holding case. Since the outer peripheral concave portion 2c of 2 and the rear end convex portion 2g of the other holding case 2 are closely fitted, the noise absorbers 11, 11 are completely connected. Then, after connecting the required number of noise absorbers 11, they may be attached to the electric wires 12. As described above, the number of the noise absorbers 11 is not limited, and the noise absorbers 11 can be connected in the axially aligned state.

[0016]

[Modification] In the noise absorber according to the present invention, the connecting form is not limited to the first embodiment described above, and the form can be achieved as shown in FIGS. 4 to 9. Each of the other embodiments will be described below with reference to the accompanying drawings.

FIG. 4 is a partially cutaway perspective view of the noise absorber 11 according to the second embodiment of the present invention. The holding case 3 includes a cylindrical portion 3a, a cylindrical portion 3b having a slightly smaller diameter formed continuously on the cylindrical portion 3a, and a disc portion 3c provided inward in the radial direction at a position recessed by a required distance inside the cylindrical portion 3a. And a through hole 3f for allowing the electric wire 12 to pass therethrough is formed in the center of the disc portion 3c. This cylindrical part 3
Reference numeral b denotes an engaging portion C, and a front end convex portion 3d slightly extending outward in the radial direction is circumferentially provided on the outer periphery of the front end portion of the cylindrical portion 3a.
The inner peripheral surface of the rear portion serves as the engaging portion D, and the front end protrusion 3 of the engaging portion C is formed.
A groove-shaped concave portion 3e into which d is detachably fitted is provided. Further, the magnetic body 10 is stored in the storage portion 13 defined by the inner peripheral surface of the cylindrical portion 3b and the disc portion 3c. Therefore, the front end convex portion 3d of the front engagement portion C of the holding case 3 that houses the magnetic body 10 in the storage portion 13 and the rear engagement portion of another holding case 3 that also stores the magnetic body 10 in the storage portion 13 By fitting the groove-shaped concave portions 3e of D, the required number of holding cases 3 accommodating the magnetic bodies 10 can be connected in an aligned manner.

FIG. 5 is a partially cutaway perspective view of the noise absorber 11 according to the third embodiment of the present invention. The holding case 4 includes a cylindrical portion 4a, a cylindrical portion 4b having a slightly smaller diameter formed continuously on the cylindrical portion 4a, and a disk portion 4c provided inward in the radial direction at a position recessed by a required distance inside the cylindrical portion 4a. And a through hole 4f is formed in the center of the disk portion 4c to allow the electric wire 12 to be inserted therethrough. This cylindrical part 4
b is an engaging portion C, which has an external thread 4d formed on its outer periphery, and the rear inner peripheral surface of the cylindrical portion 4a has an engaging portion D which is formed with an internal thread 4e into which the external screw 4d of the engaging portion C can be screwed. There is. Further, the magnetic body 10 is stored in the storage portion 13 defined by the inner peripheral surface of the cylindrical portion 4b and the disc portion 4c. Therefore, the male screw 4d of the front engaging portion C of the holding case 4 that houses the magnetic body 10 in the housing portion 13 and the rear engaging portion D of another holding case 4 that also houses the magnetic body 10 in the housing portion 13 The magnetic body 10 is formed by screwing the female thread 4e.
It is possible to connect the required number of holding cases 4 each of which is individually housed in an aligned manner.

FIG. 6 is a partially cutaway perspective view of a noise absorber 11 according to a fourth embodiment of the present invention. The holding case 5 includes a cylindrical portion 5a, a cylindrical portion 5b having a slightly smaller diameter formed continuously on the cylindrical portion 5a, and a disk portion 5c provided radially inward at a position recessed by a required distance inside the cylindrical portion. A through hole 5f is formed in the center of the disk portion 5c to allow the electric wire 12 to be inserted therethrough. This cylindrical part 5
b is an engaging portion C, which is a locking piece 5 at a predetermined position on the outer peripheral surface
d is erected, and an L-shaped groove 5e capable of locking the locking piece 5d of the engaging portion C is formed as the engaging portion D on the rear end surface of the cylindrical portion 5a. Further, the magnetic body 10 is stored in the storage portion 13 defined by the inner peripheral surface of the cylindrical portion 5b and the disc portion 5c. Therefore, the locking piece 5d of the front engaging portion C of the holding case 5 having the magnetic body 10 stored in the storage portion 13 and the rear engaging portion of another holding case 4 having the magnetic body 10 stored in the storage portion 13 are also used. Inserted in the L-shaped groove 5e of D, both holding cases 5, 5
By rotating one of them in the required direction with respect to the other, the required number of holding cases 5 accommodating the magnetic bodies 10 can be connected in an aligned manner.

FIG. 7 is a perspective view showing a partially broken view of a noise absorber 11 according to a fifth embodiment of the present invention. Each holding case 7 is composed of a case 7A and a lid 7B. . The case 7A is composed of a cylindrical portion 7a and a disc portion 7b provided at one end portion inward in the radial direction, and a through hole 7d through which the electric wire 12 is inserted is formed in the center of the disc portion 7b. . The other end of the cylindrical portion 7a in the axial direction is entirely opened, and a convex portion 7c slightly extending outward in the radial direction is provided around the outer peripheral end surface of the cylindrical portion 7a and the inner peripheral surface of the cylindrical portion 7a. Disk part 7b
The storage portion 13 is defined by and. On the other hand, the lid 7B is composed of a cylindrical portion 7e and a disc portion 7f provided at one end portion inward in the radial direction, and a through hole 7h through which the electric wire 12 is inserted is formed at the center of the disc portion 7f. There is. The other end of the cylindrical portion 7e in the axial direction is entirely opened, and a groove-shaped concave portion 7g around which the above-mentioned convex portion 7c is detachably fitted is provided on the inner peripheral surface thereof. The noise absorber 11 is formed by fitting the convex portion 7c of the case 7A having the magnetic body 10 stored in the storage portion 13 and the groove-shaped concave portion 7g of the lid 7B. However, case 7
The engaging means of A and the lid 7B may be screwed by the above-mentioned screw, locking by a locking piece and an L-shaped groove, or the like.

The front end surface of the case 7 (the outer surface of the disk portion 7f)
On the rear end surface (the outer surface of the disk portion 7b), a surface fastener (for example, a Velcro tape of the registered trademark "Velcro") is used as the joining member 16.
Is attached. Therefore, by joining the surface fasteners 16 attached to the rear part of the one holding case 7 and the surface fasteners 16 attached to the front part of the other holding case 7, the holding case 7 in which the magnetic bodies 10 are individually stored. It becomes possible to connect the required number of pieces in an array. The joining means 16 is not limited to the above-mentioned hook and loop fastener, and a seal, a double-sided tape, or the like can be suitably used.

FIG. 8 is a partially cutaway perspective view showing the method of connecting the noise absorber 11 according to the sixth embodiment of the present invention. The holding case 8 is composed of a cylindrical portion 8a and a disc portion 8b formed at one axial end portion thereof, and a through hole 8d through which an electric wire 12 is inserted is formed in the center of the disc portion 8b. . The other end of the cylindrical portion 8a in the axial direction is entirely opened, and the storage portion 1 is formed by the inner peripheral surface of the cylindrical portion 8a and the disc portion 8b.
3 is defined, and at the end of the cylindrical portion 8a, a convex portion 8e slightly extending inward in the radial direction is circumferentially provided.
The magnetic body 10 housed in 3 is stably fixed. On the other hand, on the outer peripheral surface of the cylindrical portion 8a, a protruding piece 8c having a spherical enlarged tip portion is erected, and a distance between the protruding pieces 8c generated when the holding case 8 is axially aligned. Strip-shaped plate member 17 in which through holes 17a corresponding to
Is provided as a separate body. Then, by fitting the protruding pieces 8c into the through holes 17a of the strip-shaped plate member 17 in a state where the holding cases 8 accommodating the magnetic bodies 10 are aligned in the axial direction, it is possible to connect the necessary numbers in an aligned manner. Become. In addition, in the embodiment, an example in which the protruding pieces 8c are provided upright at two positions is shown, but the number is not limited as long as the holding case 8 can be suitably connected.

FIG. 9 is a sectional view of the noise absorber 11 according to the seventh embodiment of the present invention. Hollow bolt 20 of required length
Has an outer diameter that allows it to be inserted into the insertion hole 10a of the cylindrical magnetic body 10, and the hollow portion 20b formed in the axial direction allows the electric wire 12 for absorbing electromagnetic waves to pass therethrough. In addition, a flange 20a extending outward in the radial direction is formed at one end of the hollow bolt 20, and the inserted magnetic body 1 is inserted.
Prevent the dropping of 0. By inserting a nut 22 formed with a female screw 23 that can be screwed into a male screw 21 of the hollow bolt 20 into the hollow bolt 20 while a predetermined number of magnetic bodies 10 are inserted into the hollow bolt 20, A number of magnetic bodies 10 can be connected in an array. Although the noise absorber 11 according to the present embodiment cannot completely cover the magnetic body 10 with the holding case, it can connect the magnetic bodies 10 in an array in the same manner as in the above-described embodiment and insert the magnetic body 10 therethrough. If the holes 10a are the same, they can be connected in an array even if the outer diameters of the magnetic bodies 10 are different.

[0024]

As described above, according to the noise absorber according to the present invention, when a plurality of magnetic bodies are mounted, the holding cases are formed in such a shape that they can be connected to each other, and the cases are bonded by the adhesive material. There is an advantage that it is not necessary and any number can be easily connected.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a state in which a noise absorber according to a first exemplary embodiment of the present invention is axially aligned and connected to an electric wire.

FIG. 2 is a perspective view showing a state in which two sets of noise absorbers according to the first embodiment are disassembled while being attached to electric wires.

FIG. 3 is a cross-sectional view of two sets of noise absorbers according to the first embodiment.

FIG. 4 is a partially cutaway perspective view of a noise absorber according to a second embodiment.

FIG. 5 is a partially cutaway perspective view of a noise absorber according to a third embodiment.

FIG. 6 is a perspective view showing a partially cutaway noise absorber according to a fourth embodiment.

FIG. 7 is a partially cutaway perspective view of a noise absorber according to a fifth embodiment.

FIG. 8 is a partially cutaway perspective view showing a method for connecting a noise absorber according to a sixth embodiment.

FIG. 9 is a sectional view of a noise absorber according to a seventh embodiment.

[Explanation of symbols]

 C, D Engagement part 2, 3, 4, 5, 7, 8 Holding case 2A Inner case 2B Outer case 2c, 3e Recessed part 2g, 3f Convex part 4d Male screw 4e Female screw 5d Locking piece 5e L-shaped groove 8c Projection piece DESCRIPTION OF SYMBOLS 10 magnetic body 10a insertion hole 12 electric wire 13 storage part 16 joining member 17 strip | belt-shaped plate member 17a through hole 20 hollow bolt 20a flange 20b hollow part 22 nut

Claims (8)

[Claims] 1. A holding case (2) provided with an accommodating portion (13) for a cylindrical magnetic body (10) having an insertion hole (10a) in the central axial direction, the insertion hole () of the magnetic body (10). 10a) electric wire (1
In a noise absorber (11) adapted to absorb an electromagnetic wave generated by (2) by the magnetic body (10), an engaging portion (C) and an engaging member (C) are provided at a front portion and a rear portion in the axial direction of the holding case (2). The mating part (D) is provided correspondingly, and the engaging part (D) provided on the rear part of one holding case (2) and the other holding case
By engaging with the engaging portion (C) provided in the front part of (2), it is possible to connect the required number of holding cases (2) individually storing the magnetic bodies (10) in an aligned manner. A noise absorber characterized in that 2. The holding case (2) is an inner case (2A).
Engagement part formed by fitting the outer case (2B) with the outer case (2B) and surrounding the front outer peripheral surface of the holding case (2) with a recess (2c).
(C) and an engaging portion (D) having a convex portion (2g) provided on the inner peripheral surface of the rear part of the holding case (2), and an engaging part provided on the rear part of one holding case (2) The noise according to claim 1, wherein the convex portion (2g) of the portion (D) and the concave portion (2c) of the engaging portion (C) provided in the front portion of the other holding case (2) can be fitted to each other. Absorber. 3. The front case engaging portion (C) of the holding case (3) is provided with a convex portion (3d) around the outer peripheral surface thereof, and the holding case (3)
In the rear engagement portion (D), a holding case in which a recess (3e) is provided around the inner peripheral surface of the rear engagement portion (D) and the magnetic body (10) is stored in the storage portion (13).
The convex part (3d) of the front engaging part (C) of (3) and the rear engaging part of another holding case (3) in which the magnetic body (10) is also housed in the housing part (13).
The noise absorbing device according to claim 1, wherein the recess (3e) of (D) is fitted. 4. A male screw (4d) is formed on the outer peripheral surface of the front engaging portion (C) of the holding case (4),
(4) A holding case (4) in which a female screw (4e) is formed on the inner peripheral surface of the rear engaging portion and the magnetic body (10) is stored in the storing portion (13).
Male screw (4d) of the front engaging part (C) and the rear engaging part of another holding case (4) in which the magnetic body (10) is also housed in the housing part (13).
The noise absorber according to claim 1, wherein the female screw (4e) of (D) is screwed. 5. The front engagement portion (C) of the holding case (5) is provided with a locking piece (5d) on the outer peripheral surface thereof, and the rear engagement portion of the holding case (5). (D) has an L-shaped groove on its cylindrical surface
(5e) is formed, and the retaining piece (5) of the front engaging portion (C) of the holding case (5) in which the magnetic material (10) is stored in the storage portion (13) is also stored in the storage portion (13). Insert the magnetic body (10) into the L-shaped groove (5e) of the rear engaging portion (D) of another holding case (5), and then hold both holding cases (5,
The noise absorber according to claim 1, wherein the two holding cases (5, 5) are connected by rotating any one of (5) with respect to the other in a required direction. 6. A holding case (7) provided with an accommodating portion (13) for a cylindrical magnetic body (10) having an insertion hole (10a) in the central axis direction, and the insertion hole () of the magnetic body (10). 10a) electric wire (1
In the noise absorber (11) adapted to absorb the electromagnetic wave generated from 2) by the magnetic body (10), a joining member (16) is provided on each of the front end face and the rear end face in the axial direction of the holding case (7). Arranged, one holding case (7)
By holding the joining member (16) provided at the rear part of the holding member and the joining member (16) provided at the front part of the other holding case (7), the holding case (1) in which the magnetic bodies (10) are individually housed ( A noise absorber characterized in that the required number of 7) can be connected in an array. 7. A holding case (8) provided with an accommodating portion (13) for a cylindrical magnetic body (10) having an insertion hole (10a) in the central axis direction, the insertion hole ( 10a) electric wire (1
In a noise absorber (11) adapted to absorb the electromagnetic wave generated by 2) by the magnetic body (10), a protrusion piece having an enlarged tip on the outer peripheral surface of the holding case (8).
A strip-shaped plate member in which (8c) is erected, and through holes (17a) corresponding to the distance between the protruding pieces (8c) generated when the holding cases (8) are aligned in the axial direction are sequentially provided. (17) is provided as a separate body, and the protruding piece (8) is inserted into the through hole (17a) of the strip plate member (17) in a state where the holding case (8) is aligned in the axial direction.
A noise absorber characterized in that a required number of holding cases (8) in which the magnetic bodies (10) are individually housed can be aligned and connected by inserting c). 8. A hollow bolt (20) of a required length having an outer diameter which can be inserted into a central insertion hole (10a) of a cylindrical magnetic body (10).
A nut (22) formed with a female screw that can be screwed into the male screw of the hollow bolt (20) and the other end of the hollow bolt (20) to stop the magnetic body (10) from falling off. Flange (20
a) and a hollow portion (20b) which is formed in the hollow bolt (20) in the axial direction and allows insertion of an electric wire (12) which should absorb electromagnetic waves, and the hollow bolt (20) having a required number of By inserting the nut (22) into the hollow bolt (20) while being inserted into the magnetic body (10), the required number of magnetic bodies (10) can be connected in an aligned manner. And a noise absorber.