JP2001028209A - Interface cable and interface cable device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an interface cable and an interface cable device having easy connecting operation capable of preventing deterioration of crosstalk characteristic. SOLUTION: This interface cable is composed of two pairs of twisted pair wires 2, each covered with an inner shielding layer 6, a bare conductor 3 provided inside each inner shielding layer 6 electrically contacted with the inner shielding layer 6, a one insulating coating conductor 4 disposed between the inner shielding layer 6 and an outer shielding layer 8. Connecting the two bare conductors 3 of the interface cable to the same terminal of an electric connector composes an interface cable device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interface cable used for high-speed transmission such as video transmission and an interface cable device having an electrical connector connected to an end of the interface cable.

[0002]

2. Description of the Related Art As a new interface cable for connecting peripheral devices and home electric appliances to a computer, IE
What is called EE1394 has attracted attention. This interface cable, as shown in FIG. 3, is composed of two sets of twisted pair wires 2 and two insulated conductors 4 for power supply. Each twisted pair wire 2 is formed by covering two insulated conductors 5 with an inner shield layer 6 (for example, composed of an aluminum / polyester laminate tape 6a and a metal net 6b). The two twisted pair wires 2 and the two insulated conductors 4 are covered with an outer shield layer 8 composed of a metal laminate tape 8a and a metal net 8b, and a sheath 9. When this interface cable 20 is connected to the electrical connector, a total of three of the inner shield layer 6 of each twisted pair wire 2 and one insulation-covered conductive wire 4 (which is a negative power line) are connected to the same terminal of the electrical connector. To the same potential. However, since the above connection work is complicated, as shown in FIG. 4, the negative side of the two power supply wires is a bare wire 3 and the bare wire 3 is electrically connected to the two inner shield layers 6. An interface cable 30 which has been brought into contact with each other has been developed (JP-A-10-247).
No. 425). This interface cable 30
In this case, since the two inner shield layers 6 and the bare conductor 3 serving as the negative power supply line have the same potential, only the bare conductor 3 needs to be connected to the terminal of the electric connector, and the connection operation is simplified.

[0003]

However, in the interface cable 30 shown in FIG. 4, although the bare conductor 3 (the negative power supply line) has the same potential as the two inner shield layers 6, the interface cable 30 has a twisted form. As a result, there is a problem that the position of the bare conductor 3 is biased toward one of the twisted pair wires 2 and a subtle potential difference may occur between the two inner shield layers 6. When this potential difference occurs, the grounding of one internal shield layer 6 is incomplete, while the grounding of the other internal shield layer 6 is incomplete, and the twisted pair wire 2
The crosstalk characteristics between them deteriorate.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides an interface cable which is easy to connect and can prevent the crosstalk characteristic from deteriorating, and an interface cable device in which an electrical connector is connected to the interface cable. To provide.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the invention according to claim 1 comprises two sets of twisted pair wires each covered with an inner shield layer;
In an interface cable in which a conductor is covered with an outer shield layer, the conductor is provided in each of the inner shield layers, and two bare conductors electrically contacting the inner shield layer; And one insulating-coated conductor provided between the outer shield layer and the outer shield layer.

According to a second aspect of the present invention, in an interface cable device in which an electric connector is connected to an end of an interface cable, two bare conductors are connected to the same terminal of the electric connector. An interface cable device using the interface cable according to claim 1.

According to the first aspect of the present invention, a bare conductor is provided in each internal shield layer so as to be in electrical contact with the internal shield layer. Therefore, when these bare conductors are connected to the same terminal which is the negative power terminal of the electrical connector at the end, the two sets of inner shield layers have the same potential as the bare conductors, are reliably grounded, and are two sets of twisted pair wires. It is possible to prevent the crosstalk characteristics from deteriorating.

Further, according to the second aspect of the present invention, since two bare conductors are connected to the same terminal of the electrical connector, if these terminals are used as negative power terminals, the two bare conductors are connected to this terminal. Simply by connecting to the terminal (without directly connecting the inner shield layer to the terminal), the interface cable can be easily connected to the electrical connector, and the interface cable device can be manufactured.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view of an embodiment of an interface cable according to the present invention.
In FIG. 1, the same parts as those described with reference to FIGS. In FIG. 1, an interface cable 1 has two sets of twisted pair wires 2, two bare wires 3, and one insulated wire 4. The bare conductor 3 crawls at the drop of the twisted insulated conductor 5 of the twisted pair wire 2, and (aluminum
The inner shield layer 6 (comprising a polyester laminate tape 6a and a metal net 6b) is wrapped so that the metal surface of the laminate tape 6a is on the inside. Therefore, the bare conductor 3 and the metal surface of the laminate tape 6a are in electrical contact. In addition, the two twisted pair wires 2, the insulated conductor 4 and the interposition 7 are pressed and wound by the outer shield layer 8 (consisting of the metal laminate tape 8a and the metal net 8b),
Further, the outside is covered with a sheath 9.

The present embodiment is different from the conventional example in that the bare conductor 3 is provided in the inner shield layer 6, and the bare conductor 3 is in electrical contact with the metal surface of the laminate tape 6a. is there. Therefore, in the present embodiment, the bare conductor 3 and the inner shield layer 6 have the same potential.

FIG. 2 shows the interface cable 1
FIG. 2 is an electrical connection diagram of an interface cable device in which electrical connectors 11 are connected to both ends of a cable. In FIG.
The four insulated conductors 5 constituting the two twisted pair wires 2 are connected to the terminals 12 c to f of the electric connector 11, the outer shield layer 8 is connected to the shield case 13 of the electric connector 11, and the insulated conductor serving as a positive power supply line. 4 is an electrical connector 11
Are connected to a terminal 12a serving as a positive power supply, and two bare conductors 3 serving as a negative power supply line are connected to terminals 12b serving as a negative power supply of the electrical connector 11, respectively.

The interface cable 1 of the present embodiment
Since the inner shield layer 6 wrapped around the twisted pair wire 2 is securely in electrical contact with the bare wire 3 serving as a minus power supply line, the two bare wires 3 are connected to the minus power supply of the electrical connector 11. By connecting to the terminal 12b, the internal shield layers 6 and 6 are reliably grounded at the same potential, and the deterioration of crosstalk is suppressed. Also, interface cable 1
Then, since the negative side power line is bare conductor 3,
The two bare conductors 3 are collectively kept as they are without being insulated and without stripping the coating one by one.
What is necessary is just to connect to the terminal 12b which becomes 1 negative side power supply, and connection work becomes easy.

[0013]

As described above, according to the present invention, there is an excellent effect that the connection operation is simple and the crosstalk characteristic can be prevented from deteriorating.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of an interface cable according to the present invention.

FIG. 2 is an electrical connection diagram of an interface cable device using the interface cable.

FIG. 3 is a sectional view of a conventional interface cable.

FIG. 4 is a cross-sectional view of another conventional interface cable.

[Explanation of symbols]

 1, 20, 30 Interface cable 2 Twisted pair wire 3 Bare conductor 4, 5 Insulated conductor 6 Inner shield layer 6a, 8a Laminating tape 6b, 8b Metal net 7 Intervening 8 External shield layer 9 Sheath 11 Electrical connector 12a to 12f Terminal 13 Shield Case

Claims (2)

[Claims] 1. An interface cable comprising two sets of twisted pair wires each covered with an inner shield layer and a conductor covered with an outer shield layer, wherein the conductor is provided in each of the inner shield layers, An interface cable comprising: two bare conductors electrically contacting an inner shield layer; and one insulated conductor provided between the inner shield layer and the outer shield layer. 2. The interface according to claim 1, wherein two bare conductors are connected to the same terminal of the electrical connector in an interface cable device in which an electrical connector is connected to an end of the interface cable. Interface cable device using cables.