JPH0752796B2 - Noise absorption bundle band - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a bundle band capable of efficiently absorbing noise that enters an electronic device through a power supply line / signal line.

[Prior Art] As a conventional technology of a noise absorber that is fitted onto a power supply line / signal line of an electronic device to absorb noise, the one disclosed in Japanese Utility Model Publication No. 2-49194 is known.

In the above-mentioned conventional technology, a hollow casing is formed in a shape surrounding the outer peripheral portions of the power supply line / signal line, a magnetic material is filled in the hollow casing, and a part of the power supply line / signal line is surrounded by the magnetic body. This has the function of attenuating the noise component propagating in the line.

The principle of noise absorption in such a noise absorber is generally based on the so-called pseudo-earth effect, in which noise is absorbed by a magnetic material having a large capacitance.

[Problems to be Solved by the Invention] However, it has been clarified by the present inventor that the noise absorber structure according to the above-described related art cannot obtain a sufficient noise absorbing effect.

That is, noise is a kind of energy having the property of spreading in a ripple pattern, and it is considered that the noise absorber structure that depends only on the permeation effect by the pseudo earth is not sufficient.

In addition, it has been clarified that the above-mentioned conventional technique has the following problems.

That is, in the noise attenuator according to the above-mentioned prior art, since a hard magnetic material (ferrite) is used as the attenuation medium, there is no flexibility corresponding to the size or the number of wire rods to be fitted.

Further, in the above-mentioned conventional technique, only one or a few small number of wire rods are planned to be externally fitted, and it is difficult to simultaneously take noise countermeasures for a plurality of power supply lines / signal lines.

On the other hand, if a noise attenuator that can be externally fitted to a plurality of independent wire rods is realized while maintaining the above-mentioned conventional structure as it is, a large magnetic body is required, resulting in high cost and wiring. There was a possibility that it would be difficult to secure the installation space.

Further, in the above-mentioned conventional structure, a hollow housing for housing the magnetic material is required, which causes an increase in the number of members and a complicated assembly work.

The present invention has been made in view of the above problems, and an object thereof is to provide a noise absorption bundled band that has a high noise absorption effect and can be used for general purposes regardless of the diameter or the number of wire rods. Especially.

[Means for Solving the Problems] A noise absorbing bundled band of the present invention is provided with a soft band body which is fitted onto a wire such as a power supply line or a signal line of an electronic device and surrounds the outer circumference of the wire. An electric material composed of a dielectric material, a conductor or a magnetic material is dispersed and contained in the soft band body in a fine powder state, and a first protrusion having a semicircular cross section is provided on one surface side of the soft band body. It is characterized in that it is formed substantially parallel to the extending direction of the body, and that a second protrusion having a semicircular cross section is formed on the other surface side of the flexible strip in a direction substantially orthogonal to the first protrusion. It is a thing.

Further, another noise absorption bundle band of the present invention is fitted onto a wire rod such as a power supply line or a signal line of an electronic device, and is provided with a soft band member which surrounds the outer circumference of the wire rod. An electric material consisting of a dielectric material, a conductor material, or a magnetic material is dispersed and contained in a fine powder state, and a hemispherical spherical projection is formed on one surface side of the soft strip, and the radius (φ) of the spherical projection is formed. Φ =
The characteristic is that f / (2 ⁿ C) [f is the frequency of the electromagnetic wave generated by noise, and C is the speed of light].

[Operation] According to the present invention described above, since the dielectric material, the conductor, or the magnetic material is dispersed and contained as an electric material in the soft band, electromagnetic waves generated by noise are generated in the electric material in the band. The entanglement, and the current induced thereby, forms a closed circuit in the individual particles of the electrical material. A secondary electromagnetic wave is generated by the current flowing through each of them, but its directionality is indefinite, and the secondary electromagnetic waves act to cancel each other's electromagnetic waves. As a result, the noise energy disappears.

Further, since it can be fitted onto the wire regardless of the size and number of the wire such as the power supply line and the signal line, it can be used as a highly versatile noise absorbing bundle band.

Further, a first protrusion having a semicircular cross section is formed on one surface side of the soft strip substantially parallel to the extending direction of the soft strip, and a semicircular cross section is formed on the other surface side of the soft strip. The second protrusion of the first
By forming the first protrusion and the second protrusion in a direction substantially orthogonal to the protrusion, the first protrusion and the second protrusion are arranged to face each other in the orthogonal direction on the front and back surfaces of the flexible strip, so that electromagnetic waves with different phases by 90 degrees can be reliably captured. You can

In addition, a hemispherical spherical protrusion is formed on one surface side of the flexible strip, and the radius (φ) of the spherical protrusion is φ = f / (2 ⁿ C) [f is the frequency of an electromagnetic wave generated by noise, C Is set to the speed of light, so the electromagnetic wave collection effect is high,
The spherical projections play the so-called parabolic antenna effect,
A high electromagnetic wave capture rate can be obtained.

<Embodiment> [Embodiment 1] FIG. 1 is a plan view showing a bundle band according to an embodiment of the present invention, and FIG. 2 is a side sectional view showing a state in which the bundle band is fitted onto a cable. FIG. 3 is a perspective view showing the shape of the protrusion of this embodiment.

The bundle band 1 of this embodiment has a band 2 made of a soft synthetic resin such as nylon. As shown in FIG. 1, the strip 2 has one end formed as an engagement portion 4 having an engagement claw 3 and the other end formed of a strip-shaped band portion 5.

Titanium, silicon,
Fine powder such as ferrite is contained as the electric material 10,
Such fine powder electric material 10 can be mixed in a molten state of the synthetic resin when molding the synthetic resin to be the band 2. Further, the content ratio of the electric material 10 is preferably the maximum amount in which the characteristics of the synthetic resin formed as the strip 2 do not impair the softness.

Further, on the outer peripheral surface of the band member 2, a plurality of semi-circular projections 11 having a cross section as shown in FIG. 3 are extended. The semi-circular protrusion 11 having a cross-section has a plurality of first protrusions 11a laid on one side of the strip 2 in parallel with the extending direction of the band portion 5, and the first protrusion on the other side of the strip 2. It is composed of a plurality of second projections 11b laid in a direction substantially orthogonal to 11a. The first protrusion 11a and the second protrusion 11b have a function of capturing the electromagnetic wave 13 with respect to the electric material 10 in the strip 2 and a structure that easily receives the high frequency component of the electromagnetic wave 13 in the strip 2. Has become.

In addition, by engaging the groove portion between the second protrusions 11b extending in the width direction of the strip body 2 and continuous in the longitudinal direction with the engaging claw 3 provided on the engaging portion 4, the strip body 2 is attached. The fitted cable 8 is clamped.

Here, the principle of noise attenuation in the noise absorption bundle band 1 of this embodiment will be briefly described with reference to FIG.

When noise is propagated through the cable 8 fitted with the bundle band 1, the electromagnetic waves generated by this noise 13
Is reflected by the outer surfaces of the first protrusion 11a and the second protrusion 11b and is entangled with the electric material 10 in both protrusions, and the current induced thereby forms a closed circuit 14 in the particles of the electric material 10.
Then, a secondary electromagnetic wave 15 is generated from this closed circuit 14. The directionality of such secondary electromagnetic waves 15 is indefinite, and the secondary electromagnetic waves 15 in opposite directions produce an anti-phase effect of canceling each other's electromagnetic waves. As a result, the energy of noise disappears.

Thus, as in this embodiment, the first protrusion 11a and the second protrusion 1
By providing 1b, these protrusions can enhance the wave collecting action of the electromagnetic wave 13 and enhance the noise absorption effect.

Further, according to the present embodiment, since the first protrusion 11a and the second protrusion 11b are extended in the orthogonal direction on the front and back surfaces of the strip 2, it is possible to reliably capture the electromagnetic waves 13 having different phases by 90 degrees. Therefore, noise energy can be efficiently absorbed.

The ideal shapes of the first protrusion 11a and the second protrusion 11b, that is, the radius of the semicircle can be obtained as follows.

First, since the wavelength λ is proportional to the reciprocal of the frequency f of the electromagnetic wave 13, λ = C / f (1) Also, since the receiving sensitivity is ideally a multiplier of 1/2 wavelength, φ = f / (2 ⁿ C) The diameters of the first protrusion 11a and the second protrusion 11b may be set so as to satisfy (2). In the equation (2), C is the speed of light.

[Embodiment 2] FIG. 4 is a cross-sectional view showing a bundle band 1 which is another embodiment of the present invention, and FIG. 5 is a perspective view showing a projection shape of the present embodiment.

The bundle band 1 of this embodiment has substantially the same structure as that described in Embodiment 1, but in this embodiment, as shown in FIGS. 4 and 5, the surface of the band 2 has a hemispherical shape. Spherical projection
12 are provided. In this case, by setting the radius of the spherical projection 12 to a value that conforms to the above formula (2), the effect of the parabolic antenna can be expected, a high electromagnetic wave trapping rate can be obtained, and the noise energy absorption efficiency can be further enhanced. It is a thing.

[Effects of the Invention] According to the present invention, electromagnetic waves generated by noise are entangled in particles of an electric material in a band, and a current induced thereby forms a closed circuit in the particles of the electric material. Then, a secondary electromagnetic wave whose directionality is indefinite is generated from this closed circuit, but since the secondary electromagnetic waves cancel each other's electromagnetic waves, noise energy disappears. As a result, noise propagating through the power supply line / signal line can be effectively reduced.

In addition, since it can be fitted onto the wire regardless of the size and the number of power supply lines / signal lines, a highly versatile noise absorption bundle band can be obtained.

Further, a first protrusion having a semicircular cross section is formed on one surface side of the soft strip substantially parallel to the extending direction of the soft strip, and a semicircular cross section is formed on the other surface side of the soft strip. The second protrusion of the first
By forming the first protrusion and the second protrusion in a direction substantially orthogonal to the protrusion, the first protrusion and the second protrusion are arranged in a face-to-face relationship in the orthogonal direction on the front and back surfaces of the flexible strip, so that electromagnetic waves with different phases of 90 degrees can be reliably captured. It is possible to enhance the noise absorption effect.

In addition, a hemispherical spherical protrusion is formed on one surface side of the flexible strip, and the radius (φ) of the spherical protrusion is φ = f / (2 ⁿ C) [f is the frequency of an electromagnetic wave generated by noise, C Is set to the speed of light, so the electromagnetic wave collection effect is high,
The spherical protrusions serve as a so-called parabolic antenna, and a high electromagnetic wave capturing rate can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing a bundle band according to a first embodiment of the present invention, FIG. 2 is a side sectional view showing a state in which the bundle band is fitted onto a cable, and FIG. 3 is a projection of the first embodiment. FIG. 4 is a perspective view showing the shape, FIG. 4 is a cross-sectional view showing the bundle band 1 of the second embodiment of the present invention, FIG. 5 is a perspective view showing the projection shape of the second embodiment, and FIG. 6 is the principle of noise absorption. It is an explanatory view shown. 1 ... Bundled band, 2 ... Band, 3 ... Engaging claw, 4 ...
Engagement part, 5 ... Band part, 8 ... Cable, 10 ... Electrical material, 11 ... Semi-circular protrusion in section, 11a ... First protrusion, 11b.
2nd protrusion, 12 …… Spherical protrusion, 13 …… Electromagnetic wave, 14 …… Closed circuit, 15 …… Secondary electromagnetic wave.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location H05K 7/00 D 9266-4E

Claims (2)

[Claims] 1. A noise absorption bundled band that is externally fitted to a wire such as a power supply line or a signal line of an electronic device, the band including a soft band surrounding the outer circumference of the wire, and the dielectric band inside the soft band. Body, a conductor, or an electric material composed of a magnetic material is dispersed and contained in a fine powder state, and a first projection having a semicircular cross section is provided on one surface side of the soft strip in the extending direction of the soft strip. A noise absorbing bundled band which is formed substantially parallel to each other and has a second protrusion having a semicircular cross-section formed in a direction substantially orthogonal to the first protrusion on the other surface side of the soft band member. 2. A noise absorbing bundle band that is externally fitted to a wire such as a power line or a signal wire of an electronic device, the band including a soft band surrounding the outer circumference of the wire, and the dielectric band being inside the soft band. Body, a conductor, or an electric material composed of a magnetic material is dispersed and contained in a fine powder state, and a hemispherical spherical protrusion is formed on one surface side of the soft strip, and the radius (φ) of the spherical protrusion is φ =
A noise absorption bundle band that is set to be f / (2 ⁿ C) [f is the frequency of electromagnetic waves generated by noise, and C is the speed of light].