JP2006139923A - Electromagnetic shielding cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To thin the outer diameter of a cable and to obtain the rat proof effect of the cable without impairing its electromagnetic shielding effect. <P>SOLUTION: An internal sheath 7 is coated on a wire core formed by stranding a plurality of insulated wire cores 4, a copper tape 9 is wound on the internal sheath 7, an iron tape 10 is wound on the copper tape 9, and an external sheath 12 is coated on the iron tape 10 to form this electromagnetic shielding cable. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electromagnetic shielding cable, and more particularly, to an electromagnetic shielding cable capable of reducing the outer diameter of an electric wire and obtaining a fouling effect without impairing the electromagnetic shielding effect.

  A control transmission signal flows through the control cable used in the control device. The transmission signal may be mixed into the control cable as noise due to electromagnetic waves induced by electromagnetic induction from other electric wires or cables. When this noise is mixed, the transmission signal transmitted by the control cable is transmitted as an abnormal (abnormal) signal. Since this noise-carrying signal may cause the control operation of the control device to be mistaken, it has been a problem that noise is applied to the control cable. Therefore, in order to prevent noise generated by this electromagnetic induction action, conventionally, a control cable (electromagnetic shielding cable) provided with an electromagnetic shielding layer having an electromagnetic shielding (electromagnetic shielding) effect on a control cable used in a control device has been used. It has been.

  By the way, the outermost layer of this conventionally used electromagnetic shielding cable is covered with a sheath made of a synthetic resin such as polyvinyl chloride in order to protect the cable. However, since such a control cable has a soft sheath, it may be devoured by the cocoon (corrosion caused by the cocoon). When the insulator or sheath of the control cable is stagnated, there is a problem that the control cable causes insulation failure and causes control failure of the control device. Therefore, conventionally, in order to prevent corrosion caused by this wrinkle (anti-corrosion), as shown in FIG. 2, an electromagnetic shielding cable wrapped with a metal tape dedicated to anti-corrosion is used.

  The control cable shown in FIG. 2 has a configuration in which an electromagnetic shielding cable is covered with a metal tape dedicated to fenders.

  The electromagnetic shielding cable 21 shown in FIG. 2 is formed by twisting three insulated wire cores 24 formed by covering an insulator 23 on a conductor 22. Three insulated wires 24 are formed by twisting three insulated wires 24, interposing an insulation 25 between the insulated wires 24, and applying a pressing tape 26 and a polyethylene tape 27 thereon. . A copper tape 29 is wound around the three-core cable 28, and an iron tape 30 is wound around the copper tape 29 to be covered. Further, a pressing tape 31 is wound on the iron tape 30, and an inner sheath 32 is extruded and covered on the pressing tape 31.

  A pressing tape 33 is wound around the inner sheath 32, and a fender iron tape 34 is wound around the pressing tape 33. The electromagnetic shielding cable 21 is configured by winding a pressing tape 35 on the iron-proof iron tape 34 and extruding and covering an outer sheath 36 on the pressing tape 35.

  As described above, the electromagnetic shielding cable 21 in FIG. 2 suppresses the electric field shielding effect by the copper tape 29 and the electromagnetic induction effect by the iron tape 30, and prevents the damage caused by the flaw by the fender iron tape 34.

  However, in the conventional electromagnetic shielding cable 21 shown in FIG. 2, in addition to the copper tape 29 and the iron tape 30 for electromagnetic shielding, an iron tape 34 for protection is further used. For this reason, the outer diameter of the cable becomes thicker and the flexibility is lost correspondingly. Therefore, there is a problem that handling property when the cable is laid is poor.

  Further, when the outer diameter of the cable becomes thicker, the weight of the cable becomes heavier and the transportability becomes worse accordingly, so that there is a problem that the handleability when laying the cable is poor.

  Moreover, in the conventional electromagnetic shielding cable 21, the iron tape 34 for fenders is further used in addition to the copper tape 29 and the iron tape 30 for electromagnetic shielding. The number of pass lines and the amount of iron tape used for winding the fender iron tape 34 increase. For this reason, there is a problem in that the labor and material costs for cable production are increased, and the cost for producing the cable increases.

  An object of the present invention is to provide an electromagnetic shielding cable capable of reducing the outer diameter of the cable and obtaining a fouling effect without impairing the electromagnetic shielding effect.

  An electromagnetically shielded cable according to the present invention as set forth in claim 1 covers an inner sheath on a wire core obtained by twisting a plurality of insulated wire cores, winds a copper tape on the inner sheath, An iron tape is wound on top and an outer sheath is coated on the iron tape.

  The electromagnetic shielding cable according to the present invention described in claim 2 is configured such that the thickness of the iron tape is 2 mm to 3 mm. Here, the thickness of the iron tape is set to 2 mm to 3 mm. If the thickness of the iron tape is less than 2 mm, it is not possible to obtain sufficient hardness to prevent damage caused by wrinkles even if the magnetism can be shielded. This is because if the thickness of the iron tape exceeds 3 mm, the magnetism can be shielded and the damage caused by wrinkles can be prevented, but the iron tape becomes thick. This is because when the iron tape is thick, the flexibility is lowered and it is difficult to wind it on the copper tape. Furthermore, when the iron tape becomes thicker, the outer diameter of the electromagnetic shielding cable becomes thicker, and when it is wound on the copper tape to form the electromagnetic shielding cable, the flexibility as the electromagnetic shielding cable is reduced. This is because the handleability when laying the door becomes worse. In addition, when the iron tape is thick, the weight of the electromagnetic shielding cable is increased, the transportability of the electromagnetic shielding cable is deteriorated, and the handling property when the electromagnetic shielding cable is laid is deteriorated.

  According to a third aspect of the present invention, there is provided an electromagnetic shielded cable in which the material of the inner sheath is made of hard plastic. In other words, if hard plastic with high surface hardness and rigidity (elastic modulus) is used as the material of the inner sheath of the electromagnetic shielding cable, the pressure applied from the copper tape and iron tape should not be applied to the internal insulation core. Can do. Therefore, by configuring in this way, the electromagnetic shielding cable can obtain more stable performance as a control cable.

  According to the first aspect of the present invention, it is possible to obtain an electromagnetic shielding cable capable of reducing the outer diameter of the cable and obtaining a fouling effect without impairing the electromagnetic shielding effect.

  According to the second aspect of the present invention, it is possible to obtain an electromagnetically shielded cable capable of reducing the outer diameter of the cable and obtaining a fouling effect without impairing the electromagnetic shielding effect.

  According to the third aspect of the present invention, it is possible to obtain an electromagnetic shielding cable capable of reducing the outer diameter of the cable and obtaining a fender effect without impairing the electromagnetic shielding effect.

  The present invention covers an inner sheath on a wire core obtained by twisting a plurality of insulated wire cores, winding a copper tape on the inner sheath, and an iron tape having a thickness of 2 mm to 3 mm on the copper tape Is tightly wound, and an outer sheath is covered on the iron tape.

  Hereinafter, the Example of the electromagnetic shielding cable which concerns on this invention is described in detail.

  FIG. 1 shows an embodiment of an electromagnetic shielding cable according to the present invention.

  In FIG. 1, reference numeral 1 denotes a control cable composed of an electromagnetic shielding cable. This electromagnetic shielding cable 1 is formed by twisting three insulated wire cores 4 formed by covering a conductor 2 with an insulator 3. The interposing 5 is interposed in the stranded wire to be formed into a round shape, and the presser winding tape 6 is wound thereon. An inner sheath 7 is coated on the presser winding tape 6 to form a three-core cable 8.

  A copper tape 9 is wound on the three-core cable 8, and an iron tape 10 is wound on the copper tape 9. Further, a presser winding tape 11 is wound on the iron tape 10, and an outer sheath 12 is extrusion coated on the presser winding tape 11.

  For the conductor 2 constituting the electromagnetic shielding cable 1 illustrated in FIG. 1 configured as described above, copper suitable as a conductive material is used. For the insulator 3 coated on the conductor 2, a known thermoplastic resin such as low density polyethylene (LDPE) or polyvinyl chloride (PVC) is used. Furthermore, a known polyester nonwoven fabric is used for the presser winding tape 6 for pressing and winding the twisted wire after twisting three insulated wire cores 4 formed by covering the conductor 2 with the insulator 3. It has been.

  Further, the inner sheath 7 coated on the presser winding tape 6 includes linear low density polyethylene (L-LDPE), high density polyethylene (HDPE), low density polyethylene (LDPE), polyvinyl chloride. Known thermoplastic resins such as (PVC) are used. The inner sheath 7 coated on the presser winding tape 6 protects the insulated wire core 4 inside the three-core cable 8, secures the inner diameter of the three-core cable 8 that is electromagnetically shielded, and the three cores. It is used to secure the electric transmission characteristics of the insulated wire core 4 inside the cable 8 and prevent water from entering the three-core cable 8.

  The internal sheath 7 may be made of a hard plastic having a high surface hardness or rigidity (elastic modulus), for example, a thermoplastic resin such as high density polyethylene (HDPE) or hard polyvinyl chloride (PVC). According to the configuration in which this hard plastic is used for the internal sheath 7, the pressure applied from the copper tape 9 and the iron tape 10 can be prevented from being applied to the internal insulation core 4, and the electromagnetic shielding cable 1 is used for control. More stable performance can be obtained as a cable. The internal sheath 7 can be blended with known additives such as flame retardants, heat stabilizers, and colorants, if necessary.

  A known soft copper tape is used for the copper tape 9 wound around the inner sheath 7. Since this soft copper tape is excellent in conductivity and workability, it is used as a tape for shielding an electric field.

  The iron tape 10 wound on the copper tape 9 has an effect of shielding (shielding) magnetism, and also has an effect of preventing damage caused by wrinkles. As an electromagnetic shielding cable, it is necessary to use a metal having a high magnetic permeability in terms of magnetic shielding, and in terms of preventing damage caused by wrinkles, the tape needs to be hard enough not to be caught by wrinkles.

  As a metal having a high magnetic permeability, there is iron, and the iron includes known iron and steel having high magnetic permeability such as pure iron (electromagnetic soft iron), silicon steel plate (electric iron plate), anisotropic silicon steel plate, and high purity iron. There are materials.

  Moreover, the hardness required to prevent the damage caused by the wrinkles can be obtained by changing the thickness of the iron tape 10. The thickness of the iron tape 10 is suitably 2 mm to 3 mm. And preferably, the thickness of the iron tape 10 is 2 mm. Here, the thickness range of the iron tape 10 is set to 2 mm to 3 mm because if the thickness of the iron tape 10 is less than 1 mm, the magnet tape 10 has sufficient hardness to prevent damage caused by wrinkles even if the magnetism can be shielded. This is because if the thickness of the iron tape 10 exceeds 3 mm, the magnetism can be shielded and the damage caused by wrinkles can be prevented, but the iron tape 10 becomes thick. This is because when the iron tape 10 is thick, the flexibility is lowered and it is difficult to wind it on the copper tape 9. Furthermore, when the iron tape 10 becomes thick, the outer diameter of the electromagnetic shielding cable 1 becomes thick, and when the electromagnetic shielding cable 1 is formed by winding on the copper tape 9, the flexibility as the electromagnetic shielding cable 1 is lowered. This is because the handleability when laying the electromagnetic shielding cable 1 is deteriorated. In addition, when the iron tape 10 becomes thick, the weight of the electromagnetic shielding cable 1 increases, the transportability of the electromagnetic shielding cable 1 deteriorates, and the handling property when the electromagnetic shielding cable 1 is laid deteriorates. .

  The iron tape 10 is wound on the copper tape 9 and is in electrical contact with the copper tape 9. The reason why the iron tape 10 is wound so as to be in contact with the copper tape 9 is that the electromagnetic shielding effect cannot be obtained unless the iron tape is electrically in contact with the copper tape. Therefore, as in the case of the electromagnetic shielding cable 21 illustrated in FIG. 2, when the insulators of the pressing tape 31, the inner sheath 32, and the pressing tape 33 are interposed between the copper tape 29 and the iron-proof iron tape 34. Since the fender iron tape 34 is not in electrical contact with the copper tape 29, there is no electromagnetic shielding effect. That is, unlike the electromagnetic shielding cable 1 of the present embodiment, the electromagnetic shielding cable 21 illustrated in FIG. 2 cannot perform electromagnetic shielding even if it can prevent the damage caused by wrinkles.

  Further, the iron tape 10 is tightly wound on the copper tape 9 in order to perform electromagnetic shielding and to obtain a fender effect. Therefore, even if the copper tape 9 is tightly wound on the iron tape 10, electromagnetic shielding can be achieved. However, copper is harder and softer than iron, and it can not withstand the damage caused by the cocoon, so that it will be eroded. If this copper tape is eroded by the cocoon, electromagnetic shielding will not be achieved. Therefore, when a copper tape is wound around the iron tape 10 to form an electromagnetic shielding cable, the thickness of the copper tape must be larger than the thickness of the iron tape 10 of this embodiment, and the cable is thin. The diameter cannot be achieved.

  The press-wound tape 11 wound on the iron tape 10 thus configured is used for pressing the iron tape 10 wound on the copper tape 9. The reason why the presser winding tape 11 is wound around the iron tape 10 is to prevent the outer sheath 12 from being damaged by the deformation of the iron tape 10 when the electromagnetic shielding cable 1 is bent. Furthermore, the presser winding tape 11 is wound around the iron tape 10 because the iron tape 10 is wrinkled or kinked when the iron tape 10 is wound. This is to prevent this pattern from appearing on the outer sheath 12 when the outer sheath 12 is covered. A known polyester nonwoven fabric is used as the material of the presser winding tape 11.

Further, the outer sheath 12 that is extrusion-coated on the presser winding tape 11 is used for protecting the electromagnetic shielding cable 1. For the outer sheath 12, a known thermoplastic resin such as linear low density polyethylene (L-LDPE), high density polyethylene (HDPE), low density polyethylene (LDPE), polyvinyl chloride (PVC), or the like is used. Yes. Further, the same material as that used for the inner sheath 7 can be used for the outer sheath 12. The external sheath 12 can be blended with known additives such as a flame retardant, an ultraviolet absorber, a heat stabilizer, and an antioxidant as necessary.
According to the electromagnetic shielding cable of the present embodiment obtained as described above, it is possible to reduce the outer diameter of the cable and to obtain a fouling effect without impairing the electromagnetic shielding effect.

  That is, according to the electromagnetic shielding cable of the present embodiment, a fouling effect can be obtained without impairing the electromagnetic shielding effect, and the outer diameter of the cable is thinner and the flexibility of the cable is smaller than that of the conventional electromagnetic shielding cable. Therefore, the handleability when laying the cable can be improved.

  In addition, according to the electromagnetic shielding cable of this embodiment, a fouling effect can be obtained without impairing the electromagnetic shielding effect, and the outer diameter of the cable is thinner and the weight of the cable is lighter than that of the conventional electromagnetic shielding cable. Therefore, the portability is improved, so that the handling property when laying the cable can be improved.

  Furthermore, according to the electromagnetic shielding cable of the present embodiment, a fouling effect can be obtained without impairing the electromagnetic shielding effect, and when manufacturing the cable, a path for winding the iron tape as compared with the conventional electromagnetic shielding cable Since the number of lines and the amount of iron tape used can be reduced, labor and material costs for manufacturing the cable can be reduced, and the cable manufacturing cost can be reduced.

Sectional drawing which shows one Example of the electromagnetic shielding cable which concerns on this invention. Sectional drawing of the electromagnetic shielding cable which has the conventional fender effect.

Explanation of symbols

1 ......... Electromagnetic shielded cable 2 ......... Conductor 3 ......... Insulator 4 ......... Insulated wire core 5 ......... Interposition 6 ............... Presser winding tape 7 ... ………… Inner sheath 8 ……………… Three-core cable 9 ……………… Copper tape 10 ………… Iron tape 11 ………… Presser wound tape 12 ………… Outer sheath

Claims (3)

  An inner sheath is coated on a wire core obtained by twisting a plurality of insulated wire cores, a copper tape is wound on the inner sheath, an iron tape is wound on the copper tape, and an outer portion is wound on the iron tape. An electromagnetic shielding cable characterized by being configured by covering a sheath.   The electromagnetic shielding cable according to claim 1 whose thickness of said iron tape is 2 mm-3 mm (2 mm is desirable).   The electromagnetic shielding cable according to claim 1, wherein the inner sheath is made of hard plastic.

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