JPH06302230A - Parallel cable for high-speed data transmission - Google Patents

Abstract

PURPOSE:To provide a cable capable of using a small-size and inexpensive connector by bundling a shield-attached pair wire at every bit and drain wires arranged at given intervals to apply a shield to the outermost peripheral part. CONSTITUTION:A pair wire 22 is shielded by winding it with a tape composed of a polyester layer and an alminium layer with the alminium layer made outside, and an insulating sheath is not coated. A cotton yarn 21, the pair wire 22, and a drain wire 23 are bundled, and the outer periphery of them is covered by a shield member 24 and moreover is coated by a PVC sheath 25. The member 24 uses a tape same as the shield member of the pair wire 22 with the aluminum layer made inside. This constitution eliminates the insulating sheath from the respective pair wire 22 and drain wire 23, simplifies the inside structure of a cable 20, miniaturizes a finish diameter to constitute a cable inexpensively. In connecting a connector, the connection between the shield members of the respective pair wire 22 and drain wire can be made by a cable clamp to facilitate the connection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parallel cable for high speed data transmission suitable for use in, for example, a high definition video system.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing an example of a high-definition video system. In the figure, 1 _-1 to 1 _-n are high definition VTRs, 2 is a switcher composed of a plurality of switcher blocks 2 _-1 to 2 _-m , and 3 is a monitor.

The high-definition data is composed of, for example, three primary color data G, B and R each having a sampling frequency of 74.25 MHz and one sample of 10 bits. Therefore, VTR1 _-1 to 1 _-n and switcher block 2 _-1 to 2 _-m
, Between the switcher blocks 2 _-1 to 2 _-m and the monitor 3, and between the switcher blocks 2 _-1 to 2 _-m , respectively, the high-definition data is transmitted by a parallel cable for high-speed data transmission. It

FIG. 5 shows the structure of a parallel cable 10 for high speed data transmission. In the figure, 11 is a cotton thread for increasing the tensile strength of the cable and for adjusting the cross-sectional shape of the cable into a circular shape. Reference numeral 12 denotes a pair wire formed by twisting two conductor wires each covered with an insulator. The pair wire is covered with a shield member and further covered with an insulating sheath. These cotton yarns 11 and 31 pair wires 12 are bundled so that the cross-sectional shape thereof is substantially circular, and a nylon spun-pond tape 13 is provided on the outer periphery thereof.
Are wrapped around, covered with a shield member 14, and further covered with a PVC sheath 15.

By using the 30 pair wires 12 of the parallel cable 10, three-color data G of 10-bit parallel,
Each bit data of B and R is transmitted, and the clock is transmitted by the remaining one pair line 12.

FIG. 6 shows the correspondence between the numbers of the connectors connected to the parallel cable 10 and the terminal names. No. No. 1 terminal CKA and No. 1 terminal CKA. 33 terminals CK
B is a terminal corresponding to a clock having an inverted relationship with each other, N
o. 2 to 11 terminals GD ₉ A to GD ₀ A and Nos. 34
Nos. 43 to GD ₉ B to GD ₀ B are terminals corresponding to 10-bit green data G, which are inverse to each other, No. 12
˜16, 49 to 53 terminals BD ₉ A to BD ₀ A and N
o. The terminals BD ₉ B to BD ₀ B of Nos. 44 to 48 and 79 to 83 are terminals corresponding to the 10-bit blue data B, which are in an inverse relationship to each other, No. 54 to 63 terminals RD ₉ A to RD ₀ A and Nos. The terminals RD ₉ B to RD ₀ B of Nos. 84 to 93 are terminals corresponding to the 10-bit red data R, which are in the inverse relationship to each other, No. The terminals GND of 17 to 32 and 64 to 78 are terminals for ground.

A parallel cable 1 is provided with such a connector.
When connecting to 0, No. 1-No. All of the two conductors of the 31 pair wires 12 of the parallel cable 10 and the shield member are connected to the terminals of 93 in a one-to-one correspondence.

[0008]

Since the conventional parallel cable 10 is constructed as described above, it has the following problems. That is, the pair line 12 for each bit
A shield and an insulating sheath are used as the above, and 31 such paired wires 12 are bundled, and the whole is covered with the shield member 14 and further covered with the sheath 15. There is a problem that the finished diameter of the cable 10 becomes large.

Further, when connecting the connector, there is a problem in that it takes time and labor such as stripping the sheath of the pair wire 12 for each bit for ground connection and soldering each shield member in the connector. there were. Further, since the connector connected to the parallel cable 10 needs a large number of pins (see FIG. 6), it is necessary to use a large special connector. In addition, parallel cable 1
There is a problem that the cost of 0 itself and the connector connected thereto is high.

Therefore, according to the present invention, a finishing diameter is small and can be constructed at low cost, and a general-purpose inexpensive connector can be used.
It is intended to provide a parallel cable for high-speed data transmission, which can reduce the connection work of the connector.

[0011]

A parallel cable for high-speed data transmission according to the present invention has a shielded pair wire for each bit and a drain wire arranged at a predetermined interval, and the pair wire for each bit. And the drain wire are bundled and the outermost peripheral portion is shielded.

Further, the pair wire and the drain wire for each bit do not have an insulating sheath on the outside, and the shield of the pair wire and the drain wire of each bit are brought into electrical contact with the outermost shield. .

Further, when connecting the connector, the shield of the pair wire for each bit and the shield of the outermost peripheral portion are not directly connected but are replaced by the cable clamp and the drain wire.

[0014]

In the present invention, the pair wire and the drain wire for each bit do not have an insulating sheath, the internal structure of the cable is simplified, and the finished diameter of the cable can be made small and inexpensive. Further, when connecting the connector, the shield of the pair wire for each bit and the shield of the outermost peripheral portion are not directly connected but are replaced by the cable clamp and the drain wire, so that the labor for soldering connection and the like is reduced. Further, since the finished diameter of the cable is reduced and the number of pins required for the connector is reduced, it is possible to use a general-purpose inexpensive and small-sized connector.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

In the figure, reference numeral 20 denotes the entire parallel cable for high speed data transmission of this example. Reference numeral 21 is a cotton thread for increasing the tensile strength of the cable and for adjusting the cross-sectional shape of the cable into a circular shape. Reference numeral 22 denotes a pair wire formed by twisting two conductor wires each covered with an insulator. The pair wire 22 is covered with a shield member but not with an insulating sheath.

As the wire material of the two conducting wires, for example, tin-plated annealed copper is used. An aluminum polyester tape 30 is used as the shield member, and the tape 30 is wound around the twisted pair wire 22. As shown in FIG. 2, this tape 30 has a polyester layer 30a on one side and an aluminum layer 30b on the other side,
When wound around the pair wire 20, the aluminum layer 3
0b is the outside.

Reference numeral 23 is a drain wire (ground wire). In order to prevent high frequency loss, a predetermined number of the drain wires 23 are arranged at appropriate intervals, and in this example, six drain wires 23 are arranged at an angular interval of 60 °. As will be described later, in this example, when connecting the connector, the drain wire 23 is connected to the ground terminal of the connector, and the shield member of each pair wire 22 is not connected to the ground terminal of the connector.

The above-mentioned cotton yarn 21, the 31 pair wires 22 and the drain wire 23 are bundled so as to have a substantially circular cross section, and the outer periphery thereof is covered with a shield member 24 and further covered with a PVC sheath 25. ing. As the shield member 24, an aluminum polyester tape 30 (shown in FIG. 2) is used similarly to the shield member of each pair wire 22, and the tape 30 is bundled on the cotton yarn 21, the pair wire 22 and the drain wire 23. Wrapped around. In this case, the aluminum layer 30b is wound so as to be on the inner side.

By using the 30 pair wires 22 of the parallel cable 20, the 10-bit parallel three primary color data G,
Each bit data of B and R is transmitted, and the clock is transmitted by the remaining one pair line 22.

FIG. 3 shows the correspondence between the numbers of the connectors connected to the parallel cable 20 and the terminal names. In this example, a half pitch connector for SCSII is used. No. 1, 35 terminals CKP, CKN
Is a terminal corresponding to a clock having an inverse relationship with each other, N
o. 3 to 12 terminals SIGNAL 1 (P) and No.
The terminals SIGNAL 1 (N) of 37 to 46 are terminals corresponding to 10-bit green data, which are in an inverse relationship to each other, N
o. 13 to 22 terminals SIGNAL2 (P) and N
o. The terminals SIGNAL2 (N) of 47 to 56 are terminals corresponding to 10-bit blue data which are in an inverse relationship to each other,
No. 23 to 32 terminals SIGNAL3 (P) and N
o. 57-66 terminals SIGNAL3 (N) are terminals corresponding to 10-bit red data which are in an inverse relationship to each other,
No. 2, 33, 34, 36, 67, 68 terminals GND
Is a terminal for ground.

A parallel cable 2 is provided with such a connector.
When connecting to 0, No. 1,3 to 32,35,3
No. 7 to 66 terminals are connected to the two 31 wires of the parallel cable 20 in a one-to-one correspondence. Two
6 for terminals GND of 33, 34, 36, 67, 68
The drain lines 23 of the book are connected in a one-to-one correspondence.

In this case, since the drain wire 23 is connected to the ground terminal GND of the connector, each pair wire 22 is connected.
Is not connected to the ground terminal GND of the connector. Although not shown, the cable is clamped at the inlet of the connector, so that the electrical connection between the shield member of each pair of wires 22 and the drain wire 23 can be made more dense.

In this example, the pair wire 22 and the drain wire 23 do not have an insulating sheath, the internal structure of the cable 20 is simplified, and the finished diameter of the cable can be reduced and the cost can be reduced. When connecting the connector, the cable clamp and the drain wire 2 are not directly connected to the shield member of each pair of wires 22 and the shield member 24 of the outermost peripheral portion.
Since 3 is substituted, the labor for soldering connection and the like can be reduced and the processing becomes easy. In addition, since the finished diameter of the cable is reduced and the number of pins required for the connector is reduced, a general-purpose inexpensive and compact connector can be used.

By the way, the conventional cable 10 (impedance 110Ω) has a diameter of 21.5 mm, and the connector connected thereto has a size of 74 × 25 × 65 mm and has 93 pins.
Ω) is φ9.2 mm, and the connector connected thereto has a size of 62 × 13 × 42 mm and has a 68-pin configuration.

It should be noted that the number and arrangement position of the drain lines 23 in the above-mentioned embodiment are mere examples, and needless to say, the present invention is not limited to this.

[0027]

According to the present invention, the pair wire and the drain wire for each bit do not have an insulating sheath, the internal structure of the cable is simplified, and the finished diameter of the cable can be reduced and the cost can be reduced. Further, when connecting the connector, the shield of the pair wire for each bit and the shield of the outermost peripheral portion are not directly connected but are replaced by the cable clamp and the drain wire, so that the labor for soldering connection and the like can be reduced. Further, since the finished diameter of the cable is reduced and the number of pins required for the connector is reduced, it is possible to use a general-purpose inexpensive and compact connector.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a parallel cable for high speed data transmission according to the present invention.

FIG. 2 is a cross-sectional view showing the structure of an aluminum polyester tape.

FIG. 3 is a diagram showing a correspondence between a connector number and a terminal name connected to the cable of the embodiment.

FIG. 4 is a diagram showing a configuration of a high-definition system.

FIG. 5 is a cross-sectional view showing a conventional parallel cable for high-speed data transmission.

FIG. 6 is a diagram showing a correspondence between a connector number and a terminal name connected to a conventional cable.

[Explanation of symbols]

 20 Parallel cable for high-speed data transmission 21 Cotton thread 22 Pair wire 23 Drain wire 24 Shield member 25 PVC sheath

Claims (3)

[Claims] 1. A shielded pair wire for each bit and a drain wire arranged at a predetermined interval are provided, and the outermost wire is shielded by bundling the pair wire and drain wire for each bit. Parallel cable for high speed data transmission. 2. The pair wire for each bit and the drain wire do not have an insulating sheath on the outside, and the shield of the pair wire for each bit and the drain wire and the outermost shield are electrically contacted. The parallel cable for high-speed data transmission according to claim 1. 3. The high-speed data according to claim 1, wherein when the connector is connected, the shield of the pair wire for each bit and the shield of the outermost peripheral portion are not directly connected but are replaced by a cable clamp and the drain wire. Parallel cable for transmission.