JP2016105361A - Vibration-attenuated cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable that attenuates the vibration transmitting along a cable.SOLUTION: A vibration-attenuated cable has a conductor line wound around an elastic core material, and has 4 mPa or less of a sound pressure level in a sound range of 40 Hz or less when hit at a rate of 3.46 cm/seconds with a metal rod.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cable having an effect of attenuating vibration transmitted through the cable.

Vibration transmitted through the cable becomes noise in the acoustic cable and noise in the vibration sensor. Further, in the wiring of devices that generate vibration, the vibration causes a cable sway, and there is a problem that the connector part is disconnected.
In order to solve these problems, it is necessary to mitigate vibration transmitted to the cable. For this purpose, for example, a technique for providing a shock absorbing layer around a conductor in a cable (Patent Document 1), a technique for providing a star-shaped protrusion between an inner cable and a sheath (Patent Document 2), a winding diameter of a curled cord A technique (patent document 3) and the like for relaxing vibration transmission by changing In addition, as a countermeasure in the terminal processing section, a technique for molding a vibration-proof cushion around a metal casing cap (Patent Document 4), and as a countermeasure in an earphone cord, a technique for sandwiching the middle of the cable with an elastic resin material (Patent Document) 5) etc. are proposed.

However, none of the effects exhibited by these techniques are satisfactory, and there is a need to prevent vibrations from being transmitted. In particular, in audio equipment such as headphones, there is a strong need to listen to the original sound from the current high-class thinking, and there is a strong need to reduce the noise transmitted through the cable as much as possible.
In this regard, Patent Document 6 proposes a technique for reducing noise entering from the outside by covering a cable between devices with a metal foil containing magnesium as a main component. However, even with this technique, there is a problem that sound (low frequency) when a cable hits is transmitted and it is uncomfortable.

  Each of the above existing techniques is a method for preventing vibrations that enter a conductor wire, or a method for attenuating vibrations transmitted through a conductor wire by interposing an elastic body around the conductor wire. On the other hand, Patent Document 7 discloses a technique in which insulating fibers are arranged around a conductor wire and the outer periphery thereof is wound with the conductor wire. Patent Document 8 discloses a technique for winding a conductor wire around an elastic cylindrical body, but there is no indication or suggestion about a method for attenuating vibration transmitted through a cable.

JP-A-9-259651 JP 2006-147410 A Japanese Utility Model Publication No. 64-31613 Japanese Patent Laid-Open No. 11-32765 Japanese Utility Model Publication No. 5-31499 JP 2012-14830 A JP 2011-1000071 A International Publication No. 2009/157070 Pamphlet

  An object of the present invention is to provide a cable having an effect of attenuating vibration transmitted through the cable.

  In order to solve the above-mentioned problems, the present inventors have conducted intensive studies. As a result, it has surprisingly been found that vibrations can be greatly damped by winding a conductor wire around an elastic body, and the present invention has been achieved. That is, the present invention provides the following inventions.

(1) The conductor wire is wound around an elastic core material, and the sound pressure level in a sound range of 40 Hz or less when hit with a metal rod at a speed of 3.46 cm / sec is 4 mPa or less. Vibration damping cable featuring
(2) The vibration damping cable according to (1), wherein the core member is made of two or more kinds of materials.
(3) The vibration attenuation cable according to (1), wherein a winding angle of the conductor wire is 45 ° or more with respect to an axial direction of the cable.

(4) The number of the conductor wires is two or more, the two or more conductor wires are wound with an interval in the same direction, and a variation r in the spacing of the conductor wires being wound is r The vibration damping cable according to any one of (1) to (3), wherein 0 ≦ r ≦ 4d (d is an average interval between conductor wires).
(5) The vibration damping cable according to (4), wherein a filler is wound in the same direction as the conductor wire between conductor wires wound in the same direction.
(6) A filamentous material having a different natural frequency from that of the conductor wire is further wound around the core material in a direction opposite to a winding direction of the conductor wire, and the filamentous material is the core material. The vibration damping cable according to any one of (1) to (5), wherein the vibration damping cable has a portion in contact with the cable.
(7) The vibration damping cable according to any one of (1) to (6), which has an outer coating made of a filamentous material or resin having a different natural frequency from the conductor wire.
(8) The vibration damping cable according to any one of (1) to (7), further including a shield layer.

  The vibration attenuating cable of the present invention has an effect of attenuating vibration transmitted through the cable, and is useful for applications where it is desired to prevent vibration from being transmitted.

Fig.1 (a) is a schematic diagram which shows the one aspect | mode of the vibration damping cable of this invention. FIG.1 (b) is a schematic diagram which shows another one aspect | mode of the vibration damping cable of this invention. FIG.1 (c) is a schematic diagram which shows another one aspect | mode of the vibration damping cable of this invention. 6 is a schematic diagram showing the structure of a high-quality music appreciation headphone cable used in Comparative Example 1. FIG. 6 is a schematic diagram showing a structure of an after market cable used in Comparative Example 2. FIG. It is the schematic of the cable (after terminal attachment) used in the Example. It is the schematic of the evaluation apparatus used in the Example. In an Example and a comparative example, it is the graph which showed the amplitude of the whole waveform of the striking sound conducted through the vibration damping cable. In an Example and a comparative example, it is the graph which showed the sound pressure of the striking sound propagated through the vibration damping cable. It is the graph which divided the sound pressure in an Example and a comparative example into the frequency domain, and represented it with the average value.

  The present invention will be specifically described below.

In the vibration damping cable of the present invention, it is essential that a conductor wire is wound around an elastic core material.
The core material is preferably made of a material having a rubber hardness of 70 ° or less. When a material having a rubber hardness exceeding 70 ° is used, the vibration damping effect may be insufficient. In general, soft materials tend to have a high effect of damping vibrations in molecular chains.

The core material is preferably composed of two or more kinds of materials. When the core material is composed of a single material, the vibration propagated to the core material is transmitted to the conductor wire through the core material with the wavelength changed, so that it is difficult to obtain a damping effect. .
Two or more types of materials are, for example, when there are voids inside (for example, sponge-like rubber made of rubber and air), or when insulating fibers are placed around elastic long fibers, around elastic long fibers A case in which a plurality of coverings of insulating fibers are combined to form a string-like material.

  In order to attenuate the transmitted vibration, it is necessary that vibrations having different phases overlap and cancel each other, or vibration energy needs to be converted into kinetic energy or thermal energy. More preferably, a fibrous material is interposed in the core material in that it is easily converted into kinetic energy or heat energy.

As a material which comprises the said core material, the material which has a space | gap inside is preferable.
The method of forming voids in the material includes, for example, a method in which insulating fibers are arranged around elastic long fibers, a method in which elastic long fibers are braided, and a thread in which insulating fibers are arranged around elastic long fibers. Examples thereof include a method of assembling, a method of foaming elastic long fibers, a method of hollowing out elastic long fibers, and a method combining these.
A braided yarn state in which insulating fibers are arranged around elastic long fibers is recommended because vibration is difficult to be transmitted.

  The elastic long fiber used in the present invention is preferably rich in stretchability. The type of polymer constituting the fiber is not particularly limited. For example, polyurethane-based elastic long fibers, polyolefin-based elastic long fibers, polyester-based elastic long fibers, polyamide-based elastic long fibers, natural rubber-based elastic long fibers, synthetic rubber-based elastic long fibers, composite rubber of natural rubber and synthetic rubber System elastic long fibers and the like.

Among the above, polyurethane-based elastic long fibers are suitable because they are excellent in durability. Natural rubber-based long fibers have the advantage that the stress per cross-sectional area is smaller than that of other elastic long fibers, a desired core material diameter is easily obtained, and the bending load is reduced. However, since it is easy to deteriorate, it is suitable for applications intended for short-term use.
Synthetic rubber-based elastic long fibers are suitable because they are excellent in durability.
The elastic long fiber used in the present invention may be monofilament or multifilament.

  In order to avoid signal attenuation due to a voltage drop, the conductor wire used in the present invention preferably has a large cross-sectional area. On the other hand, from the standpoint that the winding diameter of the conductor wire is not excessive, there is an upper limit in the preferred cross-sectional area of the conductor wire. The preferred cross-sectional area of the conductor wire should be considered for each application.

High-end headphone cables have been devised to reduce electrical resistance, and conductor wires of about AWG (American Wire Gauge Standard) 16-22 are often used.
However, in the present invention, a conductor wire of AWG 18 or higher is recommended so that the winding diameter does not become too large when the conductor wire is wound at a preferable winding angle described later.
On the other hand, there is a case where a cable of about AWG 36 is used for the earphone. However, in the present invention, a conductor wire of AWG 32 or less is recommended in order to avoid an excessive increase in the electric resistance of the cable.
When the cable of the present invention is applied for headphones or earphones, the conductor wire preferably has a thickness of AWG 20 to 30, more preferably AWG 22 to 26.

On the other hand, when the cable of the present invention is applied to an industrial application in which vibration is to be damped, restrictions on the outer diameter of the cable are reduced, so that a thicker conductor wire and a thinner conductor wire are used than for headphones or earphones. Also good.
As a conductor wire in the case of applying the cable of the present invention to an industrial application, a conductor wire having a thickness of about AWG 10 to 40 is preferable.

It is preferable that the conductor wire has an insulating coating made of a material having a natural frequency different from that of the conductor wire on an outer periphery of the conductor wire. The substance constituting the insulating coating is preferably made of two or more materials having different natural frequencies. Examples of the two or more materials include a braid composed of a material that is a mixture of insulating fibers and air, a sponge rubber containing air, and a composite thereof.
Such an insulating coating has an effect of suppressing vibration propagating to the conductor wire, and also exhibits an effect of attenuating vibration propagating through the conductor.

Depending on the number of signals to be transmitted, only one conductor wire may be used, or two or more conductor wires may be used.
The number of conductor wires in the present invention is preferably 1 to 36, more preferably 2 to 24. By setting the number of conductor wires in this range, the number of conductor wires necessary for information transmission can be wound at a preferable winding angle described later.

In the cable of the present invention, the winding angle of the conductor wire is preferably 45 ° or more with respect to the axial direction of the cable. More preferably, it is 50 ° or more, and further preferably 60 ° or more.
When the winding angle is less than 45 °, the vibration damping effect is poor. The cause of this is not clear, but by increasing the winding angle,
Since the tension during wiring is difficult to be transmitted to the conductor wire, it is easy to suppress the propagation of vibration, or when the vibration transmitted through the conductor wire is propagated to the core part, the vibration is caused by spiral winding. It is presumed that the effect of canceling each other appears.
The upper limit of the winding angle of the conductor wire is preferably 80 ° or less, and more preferably 70 ° or less.

In the cable of the present invention, when two or more conductor wires are wound around the core material, these conductors are preferably wound in parallel in the same direction. This is because if the conductor wires cross each other, the vibration is transmitted through the conductor and the vibration damping effect is reduced.
Further, the interval d between the conductor wires affects the quality of the signal transmitted through the cable, and is preferably 0.01 to 10 mm, more preferably 0.1 to 5 mm. Especially preferably, it is 1-3 mm. Further, the variation in the spacing between adjacent conductor lines is a variation in the value r of the variation r defined as the difference between the maximum spacing and the minimum spacing obtained by observing the winding state of 10 cm in length. It is preferably 4 times or less of the average distance d obtained by observing the state. The value of r is more preferably 3 times or less of d, and still more preferably 2 times or less of d. That is, it is preferable to satisfy the relationship represented by the following mathematical formula.
r = maximum interval−minimum interval Preferably, 0 ≦ r ≦ 4d
More preferably, 0 ≦ r ≦ 3d
More preferably, 0 ≦ r ≦ 2d
(D in the above formula is an average interval obtained by observing a wound state having a length of 10 cm.)

In the cable of the present invention, when two or more conductor wires are wound around the core material at an interval, it is preferable to fill a gap between the conductor wires with a filler. By filling the space between the conductor wires with a filler, an effect of damping the vibration can be easily obtained. Moreover, since the effect which reduces the dispersion | variation in a conductor space | interval is also acquired, use of a filler is preferable.
As the filler, it is preferable to use a filament made of insulating fibers having air. The filament can be a multifilament, a monofilament, or a spun yarn.
Examples of the thin, soft, and inexpensive material include polyester fiber and nylon fiber. Examples of the material having a low dielectric constant include fluorine fiber, polyethylene fiber, and polypropylene fiber. From the viewpoint of flame retardancy, vinyl chloride fiber, saran fiber, glass fiber and the like can be mentioned. Furthermore, examples of the material having low rigidity include polyurethane fibers and a thread-like body formed by coating the outside of the polyurethane fibers with other insulating fibers.
The filler in the present invention is not limited to the above examples, and can be arbitrarily selected from known insulating fibers.
This filler is preferably wound around the core material in parallel in the same direction as the conductor wire.

In order to further enhance the damping effect in the present invention, a filamentous material having a natural frequency different from that of the conductor wire is further wound around the core material in a direction opposite to the winding direction of the conductor wire. Preferably it is.
Examples of the thread-like material include polyester fiber, nylon fiber, fluorine fiber, polyethylene fiber, polypropylene fiber, vinyl chloride fiber, saran fiber, polyurethane fiber, and a thread-like material formed by coating the outside of the polyurethane fiber with other insulating fibers. Can be mentioned.
The diameter of the filamentous material is preferably 0.001 to 1 mm, and more preferably 0.01 to 0.1 unit. The winding angle of the filamentous material is preferably 45 to 80 ° and more preferably 50 to 70 ° with respect to the axial direction of the cable of the present invention.

The filamentous material may be wound on the conductor wire (and filler),
The conductor wire (and filler) may be wound so as to contact the core material, or may be wound so as to intersect with the conductor wire (and filler), and the conductor wire (and filler). The aspect which has a part which comes out on top, and a part which contacts a core material may be sufficient.
The filamentous material preferably has a portion that comes into contact with the core material, is wound so as to intersect with the conductor wire (and filler), and exits over the conductor wire (and filler). It is more preferable that it is an aspect having a portion in contact with the core material.

By setting it as such an aspect, the vibration which propagates the cable of this invention attenuate | damps more effectively.
As described below, according to a preferred embodiment of the present invention, the conductor wire has an outer coating or an inner coating. The filamentous material also has an effect of attenuating the vibration transmitted through the conductor wire by contacting the outer coating or the inner coating of the conductor wire.

The vibration damping cable of the present invention may have a shield layer in a further upper layer obtained by winding a conductor wire and optionally a filler and / or a filamentous material around the core material.
The shield layer can be selected from fine metal wires with good electrical conductivity, organic fibers with electrical conductivity, and combinations thereof.

  Examples of the fine metal wires having good electrical conductivity include a single wire or a stranded wire made of a copper wire having a diameter of 100 μm or less. From the viewpoint that it is difficult to propagate vibration, a twisted wire obtained by twisting a plurality of fine wires, a copper foil yarn in which a copper foil is wound around an insulating fiber, and the like are recommended. The latter is more preferable because it is easy to handle and can effectively suppress vibration propagation.

  The electrically conductive organic fiber means an organic fiber having a specific resistance of 1 Ω · cm or less. For example, the fiber etc. which filled the plating fiber and the conductive filler are mentioned. Specifically, for example, silver-plated fibers.

If the shield layer in the vibration damping cable of the present invention is a braid of fine metal wires, vibration is propagated through the braid of the metal, which is not preferable. In order to prevent this, the shield layer in the present invention is preferably a shield layer formed by winding electrically conductive fine wires in one direction. As this electrically conductive thin wire, for example, a thin wire composed of at least one selected from a metal thin wire and an electrically conductive organic fiber is recommended.
In the shield layer of the present invention, a thread may be braided in the opposite direction to the electrically conductive thin wire. The filamentous material used here is preferably thinner than the electrically conductive fine wire. The filamentous material is preferably an organic fiber, and may be an insulating fiber or an electrically conductive fiber.

  The shield layer as described above is preferably formed on the outer periphery after forming an inner coating outside the conductor wire wound around the core material. This inner coating is preferably made of an insulator. The insulator is made of, for example, an insulating thread or resin having a different natural frequency from a conductor wire wound around a core material having a different natural frequency from a conductor wire wound around the core material. Preferably there is.

The vibration damping cable of the present invention may further have an outer covering that covers the entire cable. The outer coating is preferably made of an insulator. The insulator is preferably made of an insulating thread or resin.
When the outer coating covers the outer side of the conductor wire wound around the core material without using a shield layer, an insulator (preferably an insulating filamentous material or The resin is preferably made of a material having a different natural frequency from the conductor wire wound around the core material. On the other hand, when the outer coating covers the outside of the shield layer, the natural frequency of the material constituting the outer coating is arbitrary, but the conductor wire wound around the core has a natural frequency. It is preferred to use different materials.
Examples of the material constituting the thread or resin include polyester, nylon, fluororesin, polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, and aramid.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.
The schematic diagram which shows the one aspect | mode of the vibration damping cable of this invention in Fig.1 (a)-(c) was shown.
In the vibration damping cable of FIG. 1A, four conductor wires having an insulating coating and a filler are wound in parallel in the same direction around an elastic core material. These winding angles are about 60 ° with respect to the axial direction of the cable. The breakdown of the four conductor lines is two ground lines (G), a right signal line (R), and a left signal line (L). These core material, conductor wire, and filler are further covered with an outer coating.

  The vibration attenuation cable of FIG. 1B is substantially the same as the vibration attenuation cable of FIG. 1A, but the filamentous material is wound so as to intersect with the conductor wire and the filler. In this cable, the filamentous material is wound through the conductor wire and the filler, or in contact with the core material in a region passing under the conductor wire and the filler.

The vibration attenuation cable of FIG. 1 (c) is substantially the same as the vibration attenuation cable of FIG. 1 (b), except that conductor wires, fillers, and filaments wound around the core material, and an outer covering. In addition, it has an inner coating and a shield layer.
The shield layer is made of, for example, a thin metal wire wound around the inner coating in the same direction as the conductor wire.

  The vibration attenuation cable of the present invention as described above can suppress the sound pressure level in a sound range of 40 Hz or less when hit with a metal rod at a speed of 3.46 cm / second to 4 mPa or less. This sound pressure level value is obtained by sampling a noise signal that propagates through the cable when the cable is hit, and analyzing the frequency distribution of the sampled signal by Fourier transform (40 Hz or less). It is preferably an average value of sound pressure in a sound range of 20 to 40 Hz.

  Hereinafter, the present invention will be described based on examples.

Hereinafter, the present invention will be described in detail based on Examples and Comparative Examples, but the present invention is not limited to these Examples.
The evaluation method used in the present invention is as follows.

(1) Impact sound generation Using a step motor (Oriental Motor Co., Ltd., PK543AW-PS50), a metal rod (SPCC rod having a cross section of 2 mm x 15 mm) is rotated back and forth at a speed of 3.46 cm per second. The cable to be inspected was hit.

(2) Signal attenuation evaluation A headphone (SpiritOne, manufactured by Focal-JMlab, France) is attached to an IEC standard dummy head (Southern Acoustic Co., Ltd./SAMURA, manufactured by Southern Acoustics), and the impact conducted to the headphones via a cable Sound is collected by a microphone (Denmark Bruel & Kjaer Sound & Vibration Measurement, type 4191) installed inside the headphones, and an amplifier (Denmark Bruel & Kjaer Sound & Vibration Measurement-A4, Type 4 manufactured by Denmark 4) With an audio interface (German RME Audio, Fireface 800) at a rate of 96 kHz and 32 Sampled in bit tone. Using the analysis software (manufactured by WaveMetrics, IGOR Pro 6.32A), the frequency distribution of the sampled signal was analyzed by fast Fourier transform, and the sound pressure level was measured.
The outline of this evaluation method is shown in FIG.

Example 1
<Manufacture of vibration damping cable>
A polyurethane elastic long fiber of 940 dtex (Asahi Kasei Fibers Co., Ltd., trade name: Roika) is used as a core, and 230 dtex of wooly nylon (black dyed yarn) is used as the core material with a twist of 700 T / M and Using the twist of 500 T / M as an upper twist, each was wound under a stretch ratio of 4.2 times to obtain a double cover yarn. The obtained double cover yarn was wound on a string bobbin. Four of these bobbins are arranged evenly by placing two in the S direction and two in the Z direction of an eight-placing stringing machine (manufactured by Sakurai Tekko Co., Ltd.) to produce a braid. Got.
Using the above core material, a vibration damping cable was manufactured by a special stringing machine. The special stringer is
(1) a mechanism for supplying a core material as a core,
(2) A mechanism for gripping and feeding the core material along a V-shaped groove of a duplex roll having a plurality of V-grooves along the shape of 8;
(3) A mechanism for gripping and winding the core material along a V-shaped groove of a double roll having a plurality of V-grooves along the shape of 8;
(4) a mechanism for winding the conductor wire in parallel with the core material in a state where the core material is stretched; and (5) an insulating thread-like body is reverse to the winding direction of the conductor wire in a state where the core material is stretched. It is a string making machine provided with a mechanism for winding in the direction and alternately passing through the inside and outside of the conductor wire.

While the above core material is stretched 2.2 times by the special cording machine, four USTCs (AWG28: 114 / 0.03) manufactured by Tatsuno Electric Wire Co., Ltd. and wooly nylon ( 230 dtex (black dyed yarn) × 3 aligned) is alternately wound in parallel in the Z direction at equal intervals at a winding angle of 65 °, and four polyester fibers (56 dtex (12f)) are wound in the S direction. The inner and outer sides of the conductor wire were alternately passed through and wound in parallel at equal intervals to obtain a wound product.
This wound product stretched 1.8 times, using ester wooly (330 dtex (72f, black dyed yarn x 2)), braided by a 16-punch stringing machine, and externally A vibration damping cable was obtained by forming a coating.

<Evaluation of vibration damping performance>
One end of the vibration attenuation cable manufactured above was connected to the audio output jack of the audio interface, the other end was connected to the headphones attached to the dummy head, and the other parts were hung in the air. The total cable length from the audio output jack connection to the headphone connection was 1 m (see FIG. 4).
The vibration damping cable was hit with a metal rod at a position 65 cm away from the headphones, and the impact sound propagating to the headphones was measured. At this time, no audio signal was output from the audio interface.

Comparative Examples 1 and 2
As a comparison with Example 1 above, instead of the vibration damping cable in Example 1,
In Comparative Example 1, the cable (see FIG. 2) used in the headphones for high-quality music appreciation (manufactured by Austria AKG Acoustics, K701) is used in Comparative Example 2 to improve electrical characteristics. In the same manner as in Example 1 except that aftermarket cables (manufactured by Koyanagi Electric Co., Ltd., HPC-22W, see FIG. 3), which are widely available for retrofitting to headphones, were used respectively. The vibration damping performance was evaluated.

<Evaluation results>
The evaluation results obtained in the above examples and comparative examples are shown in FIGS. FIG. 6 is a graph showing the change over time in the sound pressure level after hitting,
FIG. 7 is a graph obtained by Fourier-analyzing the data obtained by measuring the value for 1.1 seconds before and after the time when the cable was struck 50 times, and graphing the intensity of the component for each frequency. The average of the sound pressure level for each sound range when the obtained frequency component data is divided into low frequency (20 to 40 Hz), medium frequency (40 to 80 Hz), and high frequency (80 to 160 Hz) sound ranges. Value. This average value was calculated by allocating a value obtained by integrating the sound pressure with the frequency within the frequency range.
From FIG. 6, the amplitude of the entire waveform of the impact sound conducted through the vibration damping cable of Example 1 is compared with those of Comparative Example 1 (standard cable) and Comparative Example 2 (aftermarket cable). You can see that it is dramatically smaller.
From FIG. 7, when conducted through the vibration damping cable of Example 1, the sound pressure of the hitting sound is dramatically attenuated in a wide frequency range, and in particular, an extremely low frequency component of 10 Hz or less is almost completely obtained. It turns out that it is attenuated.
Further, from FIG. 8, the sound pressure in the low frequency band of 20 to 40 Hz of the impact sound conducted through the vibration damping cable of Example 1 is compared with Comparative Example 1 (standard cable) and Comparative Example 2 (aftermarket cable). It can be seen that there is a dramatic decrease compared to the case of). The sound pressure level in the 20 to 40 Hz region can be considered to be substantially equal to the sound pressure level in the frequency region of 40 Hz or less with respect to Example 1 in consideration of the result of FIG.

  From the above results, it can be seen that the vibration attenuating cable of the present invention is an epoch-making cable capable of attenuating low-frequency vibration, which has been difficult with conventional cables.

  The vibration attenuating cable of the present invention can be suitably used in the acoustic field, the vibration sensor field, the wiring of equipment with vibration, and the like.

Claims (8)

A conductor wire is wound around an elastic core material, and a sound pressure level in a sound range of 40 Hz or less when hit with a metal rod at a speed of 3.46 cm / sec is 4 mPa or less. Vibration damping cable.   The vibration damping cable according to claim 1, wherein the core material is composed of two or more kinds of materials.   The vibration damping cable according to claim 1, wherein a winding angle of the conductor wire is 45 ° or more with respect to an axial direction of the cable. The number of the conductor wires is two or more, the two or more conductor wires are wound at intervals in the same direction, and the variation r between the conductor wires being wound is 0 ≦ The vibration attenuating cable according to any one of claims 1 to 3, wherein r≤4d (d is an average interval between conductor wires).   The vibration damping cable according to claim 4, wherein a filler is wound in the same direction as the conductor wire between conductor wires wound in the same direction. A portion in which the filamentous material having a different natural frequency from that of the conductor wire is further wound around the core material in a direction opposite to the winding direction of the conductor wire, and the filamentous material is in contact with the core material The vibration damping cable according to claim 1, comprising:   The vibration damping cable according to any one of claims 1 to 6, further comprising an outer sheath made of a filamentous material or a resin having a different natural frequency from that of the conductor wire.   The vibration damping cable according to any one of claims 1 to 7, further comprising a shield layer.

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