JP2005032583A - Shield cable for communication for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shield cable for automobile of which terminal processing is made easy and which is suitable for transmission of differential signal of 100 Ω. <P>SOLUTION: This is a communication shield cable 11 for automobile which comprises a pair of stranded wires 12 which is made by stranding a pair of insulating core wires 16, 16 having a conductor 17 and an insulator 18 to cover the conductor 17, a metal foil shield 14 for shielding to cover the pair of stranded wires 12, a grounding cable 13 to conduct to the metal foil shield 14, and a sheath 15 to cover all of these, and in which the impedance value is made to be 100±10 Ω. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a shielded electric wire for communication for automobiles.

As this type of shielded electric wire for communication, one as shown in FIG. 2 is known. That is, the conventional shielded electric wire for communication 1 has a pair of electric wires 4 and 4 provided with the first insulating coatings 3 and 3 around the conductors 2 and 2 arranged in parallel so as to be parallel to each other. The second insulating coating 5 is provided around the electric wires 4 and 4, and the shield layer 6 and the sheath 7 are sequentially covered around the second insulating coating 5 (see, for example, Patent Document 1). Incidentally, the conventional shielded electric wire 1 for communication shown in FIG. 2 is proposed in order to obtain an impedance value of 120Ω.
JP 2001-76551 A (2nd page, FIG. 1)

  By the way, in the said prior art, since there is no grounding electric wire (drain wire) in the structure, there exists a problem that it takes time to process the terminal of the shielded electric wire 1 for communication. In addition, there is a problem that it is not suitable for transmission of a differential signal of 100Ω.

  This invention is made | formed in view of the situation mentioned above, and makes it a subject to provide the shield wire for communication for motor vehicles which makes terminal processing easy and suitable for transmission of a differential signal of 100 ohms.

  The communication shielded electric wire for automobiles of the present invention according to claim 1 made to solve the above-mentioned problems is a twisted pair formed by twisting a pair of insulated wire cores provided with a conductor and an insulator covering the conductor. A wire, a shield metal foil shield covering the twisted wire, a grounding electric wire conducting to the metal foil shield, and a sheath covering the whole, and an impedance value of 100 ± 10Ω It is characterized by being configured.

  According to a second aspect of the present invention, there is provided an automotive communication shielded electric wire according to the present invention, wherein the insulator is made of an insulating material having a relative dielectric constant of 2.1 to 2.5. It is characterized by being molded using.

  According to a third aspect of the present invention, there is provided a communication shielded electric wire for automobiles according to the present invention, wherein the insulator is cross-linked polyethylene, and the thickness of the insulator is 0.35. It is characterized by being -0.45 mm.

  According to a fourth aspect of the present invention, there is provided a communication shielded electric wire for automobiles according to the present invention, wherein the outer diameter of the insulated wire core is set to 1.25 to 1.45 mm. It is a feature.

  According to a fifth aspect of the present invention, there is provided an automotive communication shielded electric wire according to the first aspect of the present invention, wherein the insulator and the sheath are made of an insulating material that does not contain a halogenated substance. It is characterized by being molded.

  According to the present invention, since the twisted wire is used, the influence from the external noise can be suppressed to be lower than that in the case of the parallel wire. Moreover, since it has the electric wire for grounding, it is comprised so that a terminal process may become easy. Furthermore, it is configured to be suitable for transmission of a 100Ω differential signal. Furthermore, it is constructed with consideration for the environment.

  According to the first aspect of the present invention, it is possible to provide a shielded cable for communication for automobiles that facilitates terminal processing and is suitable for transmission of a differential signal of 100Ω.

  According to the present invention described in claims 2 to 4, there is an effect that an impedance value suitable for a differential signal can be provided.

  According to the present invention described in claim 5, there is an effect that it is possible to consider the environment.

  Hereinafter, description will be given with reference to the drawings. FIG. 1 is a configuration explanatory view showing an embodiment of a shielded electric wire for communication of an automobile according to the present invention.

  In FIG. 1, reference numeral 11 indicates the shielded electric wire for communication of the present invention. The automotive communication shield wire 11 includes a twisted pair wire 12, a ground wire 13, a metal foil shield 14, and a sheath 15. The shielded electric wire 11 for automobile communication is configured so that the impedance value is 100 ± 10Ω.

  The twisted pair wire 12 is formed by twisting a pair of insulated wire cores 16 and 16 at a predetermined pitch. The insulated wire core 16 has a conductive conductor 17 and an insulating property that covers the conductor 17. The insulator 18 is provided. The conductor 17 is composed of concentric stranded wires in the same direction. The insulator 18 is formed using an insulator material having a relative dielectric constant of 2.1 to 2.5. More specifically, in this embodiment, the insulator 18 is an insulator material that does not contain a halogenated substance, and is molded using a cross-linked polyethylene (relative dielectric constant 2.3) (preferably in consideration of the environment). Is the form). As an example, in the case of a shielded electric wire 11 for automobile having a nominal (size × configuration) 0.22 × 2, the thickness of the insulator 18 made of crosslinked polyethylene is 0.35 mm to 0.45 mm, and the insulation core 16 Are preferably included in the range of 1.25 mm to 1.45 mm.

  The grounding wire 13 is a so-called drain wire having conductivity, and is provided between the pair of insulated wire cores 16 and 16 in accordance with the twist. The grounding wire 13 is provided so as to be electrically connected to the metal foil shield 14. Similarly to the conductor 17, the grounding wire 13 is composed of concentric stranded wires in the same direction.

  The metal foil shield 14 is a so-called shield member having conductivity, and is provided around these so as to cover the twisted pair wire 12 and the grounding wire 13. The metal foil shield 14 is not particularly limited, but is made of an aluminum foil shield. The metal foil shield 14 is provided so as to be vertically attached to the twisted pair wire 12 and the grounding wire 13.

  The sheath 15 is an insulating covering member and is provided around the metal foil shield 14. In this embodiment, the sheath 15 is formed using a flame-retardant insulator material that does not contain a halogenated substance (a preferable form in consideration of the environment).

  In the said structure, since the shielded electric wire 11 for motor vehicles uses the twisted pair wire 12, the influence from external noise is restrained low compared with the case of a parallel wire like a prior art example. Moreover, since it has the electric wire 13 for grounding, it is comprised so that a terminal process may become easy compared with a prior art example. Furthermore, since the thickness of the insulator 18 made of crosslinked polyethylene is controlled, the insulator 18 is suitable for transmission of a differential signal of 100Ω.

  Next, a specific example of the shielded electric wire 11 for automobiles of the present invention will be described with reference to Table 1 and FIG.

For example, the finished communication outer diameter of the nominal (1) 0.22 × 2 automotive shielded electric wire 11 for the automobile is 3.8 mm. Further, the wire configuration of the conductor 17 constituting the pair of insulated wire cores 16 and 16 is 7 / circular compression, and the outer diameter of the conductor 17 is 0.55 mm. Moreover, the thickness of the insulator 18 which comprises a pair of insulated wire cores 16 and 16 is 0.45 mm. The outer diameters of the pair of insulated cores 16 and 16 are 1.45 mm (outer diameter tolerance ± 0.05), and the twist pitch thereof is 25 ± 5 mm. The wire configuration of the grounding wire 13 is 15 / 0.18 mm, and the calculated cross-sectional area of the grounding wire 13 is 0.3817 mm ² . Moreover, the thickness of the metal foil shield 14 is 0.05 mm. The thickness of the sheath 15 is 0.4 mm.

  In addition, it goes without saying that the present invention can be variously modified without departing from the spirit of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration explanatory view showing an embodiment of a shielded electric wire for communication according to the present invention. It is composition explanatory drawing of the shielded electric wire for communication of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Shield wire for communication for automobiles 12 Twisted wire 13 Wire for ground 14 Metal foil shield 15 Sheath 16 Insulated wire core 17 Conductor 18 Insulator

Claims (5)

A shielded cable for communication for automobiles,
A twisted pair of insulated wire cores each having a conductor and an insulator covering the conductor, a shielded metal foil shield covering the twisted wire, and the metal foil shield An automotive communication shielded electric wire comprising a grounding electric wire that conducts and a sheath covering all of the electric wire, and an impedance value of 100 ± 10Ω. In the shielded electric wire for automobiles according to claim 1,
A shielded electric wire for automobile communication, wherein the insulator is molded using an insulator material having a relative dielectric constant of 2.1 to 2.5. In the shielded electric wire for automobiles according to claim 2,
The said insulator is a crosslinked polyethylene, The thickness of this insulator was 0.35-0.45 mm. The shielded electric wire for communication for motor vehicles characterized by the above-mentioned. In the shielded electric wire for automobiles according to claim 3,
An outer diameter of the insulated wire core is set to 1.25 to 1.45 mm. In the shielded electric wire for automobiles according to claim 1,
A shielded electric wire for communication for automobiles, wherein the insulator and the sheath are molded using an insulator material not containing a halogenated substance.

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