JPS59211910A - Flat cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flat cable, and particularly to a flat cable that reduces noise induction.

2. Description of the Related Art Conventionally, flat cables have been used in which a large number of conductive wires are arranged in a flat plate shape at intervals and the conductive wires are insulated with an insulator to transmit and receive a large number of signals and electric power.

FIG. 1 is a perspective view of an example of a conventional flat cable.

In FIG. 1, number 1. 2. 3 is a conductor wire,
These conductor wires are covered with an insulator 4 and integrally formed into a flat plate.

FIG. 2 is an equivalent circuit diagram when signals are transmitted through the flat cable shown in FIG. 1.

In Fig. 2, number 5 indicates the earth voltage; 7. 8゜9.
10, 11, and 12 indicate stray capacitances distributed between each conductor wire and between the conductor wire and the ground air, and 6 indicates one of various noise sources outside the flat cable. Also, 1
3, 14.15 represents the stray capacitance between each conductor line 1°2.3 and this external noise source.

These conductor wires1. 2. If a signal is transmitted to 3, 1
For example, in addition to the original signal, the conductor line 1 has a stray capacitance of 10.
11, signals flowing to other conductor lines will be induced. In addition, external noise is also induced via the stray capacitance 13, and all of these noises become noise with respect to the original signal of the conductor line 1. Especially when transmitting high frequency signals.

This has the disadvantage that the induction from other conductor wires becomes very large.

The present invention eliminates the above-mentioned drawbacks and provides a flat cable in which the influence of noise from outside and between a plurality of conductor lines transmitting signals is reduced.

The flat cable of the present invention consists of a plurality of cables each consisting of a conductor wire covered with a first insulator and a conductor surrounding the first insulator, which are arranged substantially parallel to each other on a flat plate at intervals. It is constructed by integrating and covering with a second insulator.

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 3 is a perspective view of one embodiment of the present invention.

Each of the plurality of conductor wires 16, 17.18 is covered with a first insulator 19, 20.21, respectively, and the periphery thereof is further covered with a conductor 22, 23.24, respectively.

The cables thus formed are arranged substantially parallel on a flat plate and integrally covered with a second insulator 25. This completes the flat cable of the present invention.

FIG. 4 is an equivalent circuit diagram when signals are transmitted to the embodiment shown in FIG. 3.

In FIG. 4, pot numbers 26, 27, and 28 indicate stray capacitances between conductors transmitting signals and conductor lines around them. By supplying earth air to the conductor lines 19, 20.21, the conductor lines 16.1718 transmitting signals are shielded from each other by earth air. Further, the conductor lines 16, 17, 18 are also shielded from an external noise source 29. As a result, when transmitting signals using the flat cable according to the present invention, external noise can be sufficiently reduced, and mutual induction between the conductor lines 16, 17, 18 can be prevented. The effect is that high frequency signals can be transmitted with low noise.

As explained above, the present invention has a structure in which each of a plurality of conductor wires is covered with a conductor through an insulator to shield external noise and induction between the conductors, so that signals can be transmitted with low noise. This has the effect of providing a flat cable that can be used.

[Brief explanation of drawings]

Figure 1 is a perspective view of an example of a conventional flat cable, Figure 2 is a perspective view of an example of a conventional flat cable.
The figure is an equivalent circuit diagram when a signal is transmitted to the flat cable shown in Figure 1, and Figure 3 is the present invention 1, courtesy 3...
・Conductor wire, 4...Curved insulator, 5...Curved ground, 6...
...External noise source, 7-15...Song stray capacitance. 16.17, 18...Curved conductor wire, 19.2o, 21...
first insulator, 22, 23. 24... curved conductor, 25...
...Second insulator, 26, 27. ．． 28...
... Stray capacitance. 29... External noise source. 5- Closed second circle

Claims (1)

[Claims] A plurality of cables in which a conductor wire is covered with a first insulator and the circumference is further covered with a conductor are arranged in a substantially parallel flat plate at intervals, and these cables are integrally covered with a second insulator. A flat cable that is characterized by: