JPH0229610Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Background and Purpose of the Invention] The present invention relates to a flat cable whose conductors can be classified into a plurality of types during terminal processing.

In order to improve crosstalk characteristics, conventional flat cables are sometimes used with a signal line and a ground line for each conductor, or with ground lines on both sides of the signal line.

In this case, when processing the terminals for connector installation, it is necessary to distinguish between the signal line and the ground line, so the exposed lengths of the signal line and ground line are changed to identify them. There is.

Figures 1 and 2 show an example of a conventional flat cable terminal processing method, in which 1 is a plurality of conductors arranged in parallel, and an insulator 2 is provided around the outer periphery of the conductors. .

Each conductor 1 is used as a signal line S and a ground line G.

When identifying this flat cable at its terminal end, first, only the signal line S to be identified is cut to a certain length from above the insulator 2 using the cutter 3.

Next, the insulator 2 is stripped from a predetermined location (arrow in FIG. 1).

FIG. 2 shows the shape of the terminal portion after stripping.

The signal line S to be identified is shorter than the ground line G because its tip has been cut off with a cutter in advance.

The type of conductor can be identified based on the difference in length of the exposed conductor.

However, in this conventional identification method, if there is a large error in pitch between conductors, there is a risk of damaging other conductors when cutting the conductor to be identified.

Another drawback was that it required two steps: cutting the conductor with a cutter and stripping it, which was time-consuming.

The purpose of the present invention is to eliminate the drawbacks of the prior art described above and to provide an improved flat cable whose terminal can be easily and reliably processed in a single process without damaging the conductor. It is in.

[Summary of the idea]

In other words, the gist of the present invention is that it consists of a plurality of conductors arranged in parallel and an insulator provided around the outer periphery of the conductor, and the conductor has signal lines and ground lines arranged alternately. A flat cable is characterized in that a release agent is provided on the outer periphery of the signal line so that the strength of adhesion of the signal line and the ground line to the insulator is different.

In the above, as the conductor, a single wire or a stranded wire such as an annealed copper wire, a tin-plated annealed copper wire, or a silver-plated annealed copper wire is used.

As the insulator, polyethylene, vinyl chloride, or fluororesin insulator is used, and it is provided by extrusion, taping, etc.
A conventionally known flat cable can be used as is.

〔Example〕

Next, one embodiment of the present invention will be further described with reference to the accompanying drawings.

In FIG. 3, numeral 1 denotes a plurality of conductors arranged in parallel, the outer periphery of which is extruded and coated with an insulator 2. In FIG.

Reference numeral 4 denotes a mold release agent such as silicon applied to the outer periphery of the signal line S, which weakens the adhesion strength between the signal line S and the insulator 2.

When the flat cable constructed in this manner is terminal-treated, as shown in Fig. 4, the signal line S with weak adhesive strength receives less tensile force when the terminal strip is applied, so that the conductor is removed by the strip. The conductor has a small elongation, so the length of the conductor after stripping is shorter than that of the ground line G, and the signal line S and the ground line G can be distinguished from each other.

According to an experiment, when the insulator 2 was stripped to 7 mm, the signal line S coated with a mold release agent was exposed by 7 mm, while the ground line G was exposed by 9 mm.
The identification was clear.

[Effect of idea]

As explained above, according to the present invention, there is no risk of damaging the conductor during terminal processing, and defects in terminal processing can be eliminated.

In addition, although conventional terminal processing required two steps, this invention enables it to be completed in one step, greatly improving the efficiency of terminal processing, and its practical value. There is something very big about it.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams showing the terminal processing status of a conventional flat cable, and FIG. 3 is a cross-sectional explanatory diagram showing an embodiment of the flat cable of the present invention.
FIG. 4 is a perspective explanatory view showing the state of terminal processing of the flat cable of the present invention. 1: Conductor, S: Signal line, G: Ground line, 2:
Insulator, 3: cutter, 4: mold release agent.

Claims (1)

[Scope of utility model registration request] Consisting of a plurality of conductors arranged in parallel and an insulator provided around the outer periphery of the conductor, the conductor has signal lines and ground lines arranged alternately,
A flat cable characterized in that a release agent is provided on the outer periphery of the signal line, so that the strength of adhesion of the signal line and the ground line to the insulator is different.