JP2842428B2 - Noise absorber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for absorbing electromagnetic induction noise from surroundings applied to a signal cable for transmitting an electric signal.

[0002]

2. Description of the Related Art As a noise absorbing device of this type, a pair of half cylinders (41, 41) made of ferrite as shown in FIG. 41), a cable (42) is inserted through the inside thereof, and a split case (43) is attached to the outside thereof as shown in FIG. 12, and holes (44, 44) at both ends of the case (43) are provided. (For example, Japanese Utility Model Publication No. 7-51772).
issue).

[0003]

The conventional structure requires the case (43), which increases the cost, and the cable (42) is supported by the holes (44, 44) at both ends of the case (43). Therefore, there are also problems such as difficulty in contacting the inner surface of the ferrite half-cylinder and poor noise absorption efficiency.

[0004]

Means for Solving the Problems As a means for solving the above problems, the present invention comprises a pair of half cylinders made of a ferrite material, and both edges (3A) of the pair of half cylinders (1A, 1B). , 3
A, 3B, 3B) are the intermeshing possible irregularities (3C, 3D), Van said pair of semi-cylindrical body (1A, 1B) to the combination periphery
The present invention provides a noise absorbing device (1) in which a polygonal cable insertion hole (2) is formed inside (2A, 2B) in a state where a cable (6) is wound and fixed .

[0005]

[Action] In the noise absorbing device (1) of the present invention, a pair of half cylinders
Union of body (1A, 1B) Cable insertion formed inside
Since the hole (2) has a polygonal shape, Bull insertion hole (2)
The inserted cable (5, 5A) is inserted into the pair of half-cylinders (1A, 1B).
Yo To make close contact with the inside of the half cylinder (1A, 1B).
You. In addition, the half cylinder (1A, 1B) Mutually uneven (3C, 3D) phase
Interengagement increases the mutual contact area. This Two like
The noise absorption characteristics are greatly improved by the factors described above.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One specific example of the present invention is shown in FIGS.
Shown in In the figure, (1A) is a semi-cylindrical body made of a ferrite material, and the inside (2A) of the semi-cylindrical body (1A) is polygonal (half pentagon in this specific example). (3A, 3A) has an uneven shape, and a belt groove (4A) is formed in the center.

Furthermore (1B) is another of the half cylindrical body, a ferrite material, the inner (2B) of the semi-cylindrical body (1B) is polygonal (in the case of this specific example semi pentagon) is the And both edges (3
B, 3B) have irregularities (3C, 3D) that can mesh with both edges (3A, 3A) of the half cylinder (1A). The uneven shape (3C,
3D) has a waveform or pulse shape.

As shown in FIG. 2, the half-cylinders (1A, 1B) are assembled by sandwiching, for example, two cables (5, 5) inside, and a belt (6) with a buckle (6A) or a string the belt groove (4A, 4B) are fastened to by bundling over to configure the noise absorbing apparatus (1) or the like. In this case, the two cables (5, 5) are hexagonal cable insertion holes formed by the insides (2A, 2B) of the half-cylinders (1A, 1B) as shown in FIG.
In (2), the half cylinder (1A, 1B)
(1A, 1B), and the half cylinders (1A, 1B) are combined to form the cylinder (1), but the half cylinders (1A, 1B)
Both edges (3A, 3A, 3B, 3B) of the
C, 3D), the mutual contact area of the half-cylinders (1A, 1B) is also enlarged, and the noise absorption characteristics are greatly improved by these.

In the above specific example, as shown in FIG. 4, only one cable (5A) may be inserted depending on its thickness, or three or more cables may be inserted.

[0010] Other embodiments in FIGS. 5 and 6 are shown. The figure shows a toroidal core (11) as a noise absorbing device, which is composed of half cylinders (11A, 11B), and both edges (13A, 13B) of the half cylinders (11A, 11B) are mutually opposed. meshing possible irregularities (@ 13 C, 13D) are on, semi cylinder (11A, 11B) is in a state superimposed by a buckle (16A) with a band (16), is clamped as shown in FIG. 6 The inside of the cable insertion hole (1
2) is formed.

FIG . 7 shows a modification of the above embodiment.
In this deformation, one edge (23A) of one toroidal core (21A) of the toroidal core (21) has a convex shape (23C), and the other edge (23A) has a concave shape (2A).
3D), and the other half cylinder (2
1B), a concave shape (23D) is formed on one edge (23B) and a convex shape (23C) is formed on the other edge (23B), and both half cylinders (21A, 21B) are formed.
In the state in which are overlapped, the convex shape (23C) fits into the concave shape (23D).

Still another embodiment in FIGS. 8 to 10 are shown. In the figure, (31A, 31B) is a pair of half cylinders similar to the specific example shown in FIGS. 1 to 4, and the inside (32A, 32B) of the half cylinder (31A, 31B) is a polygon (half). Pentagon), both edges (33A, 33A, 33B, 33B) are made uneven, and a belt groove (34A, 34B) is formed in the center. At the inside (32A, 32B) of the body (31A, 31B), projections (35A, 35B) for preventing cable disconnection are formed, respectively, and at both ends, recesses (36A, 36B) for play of the cable (25) are provided. ) Is formed. The pair of half cylinders (31A, 31B) are combined as shown in FIG. 10 to form a noise absorbing device (31), but with the cable (25) inserted through the cable insertion hole (32), The protrusions (35A, 35B) of the half cylinders (31A, 31B) are
(25) Cut off the cable (25) by cutting into the outer periphery.

[0013] In addition to the above specific examples, the cable insertion hole may have a polygonal shape other than a triangle, a quadrangle, a pentagon, and a hexagon.

[0014]

According to the present invention, a noise absorbing device which does not require a case and has excellent noise absorbing characteristics is provided.

[Brief description of the drawings]

 1 to 4 show a specific example of the present invention.

FIG. 1 is an exploded perspective view.

FIG. 2 is an assembled perspective view.

FIG. 3 is an assembled front view.

FIG. 4 is an assembled front view showing a state in which only one cable is inserted. FIGS. 5 and 6 show another embodiment of the present invention.

FIG. 5 is an exploded perspective view of the toroidal core.

FIG. 6 is an assembled perspective view of the toroidal core.

FIG. 7 is a modified exploded perspective view of the above specific example. FIGS. 8 to 10 show still another specific example.

FIG. 8 is an exploded perspective view.

FIG. 9 is a view of the inner surface of a half cylinder.

FIG. 10 is an assembled front view.

FIG. 11 is a perspective view of a conventional semi-cylindrical body.

FIG. 12 is an assembled perspective view of a conventional example.

[Explanation of symbols]

1,11,21,31 Noise absorbing device (Troidal core) 1A, 1B, 11A, 11B, 21A, 21B, 31A, 31B Half cylinder 2,12,22,32 Cable insertion hole 2A, 2B, 32A, 32B Inside 3A, 3B, 13A, 13B, 23A, 23B, 33A, 33B Both edges 3B, 3C, 13C, 13D, 23C, 23D Roughness 5,5A, 15,25 Cable 6,16 Belt (band)

Claims (2)

(57) [Claims] 1. A a pair of semi-cylindrical body in which a ferrite material, said pair of edges of the semi-cylindrical body is capable irregularities meshing each other, band combining periphery of the pair of semi-cylindrical body
Characterized in that a polygonal cable insertion hole is formed on the inside in a state where the cable is wound and fastened and fixed. 2. The noise absorbing device according to claim 1, wherein a projection for preventing cable disconnection is formed inside one or both of said half cylinders.