JPS6345693Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a flat cable with less crosstalk between lines.

With the recent increase in the density of electronic equipment, flat cables have been effectively applied to interfaces, internal wiring, and other applications.

In order to prevent disturbances from entering these flat cables, one or both sides of the cables are
Furthermore, in some cases, an electromagnetic shield is provided around the entire circumference of the cable. However, this was only a measure against disturbances, and did not provide any effect on crosstalk between lines.

Therefore, the object of this invention is to provide a flat cable that can reduce inter-line crosstalk by using a shield for preventing disturbances.

Therefore, according to this invention, a plurality of conductors and one tape-shaped body forming a convex portion on the outside by forming a plurality of juxtaposed grooves recessed only on one side for accommodating the plurality of conductors; and another tape-shaped body that closes the plurality of grooves of the one tape-shaped body and holds the plurality of conductors in the grooves, and the other tape-shaped body is closely disposed outside of the one tape-shaped body and is located between the conductors. A flat cable comprising a conductive shield is constructed. With this configuration, the conductor is located within the groove of one of the tape-shaped bodies, and the conductive shield that is close to the outside of one of the tape-shaped bodies is located between the conductors. Talk can be significantly reduced. In order to further reduce crosstalk, the stroke can be almost completely blocked by providing a ground wire at an intermediate position between the conductors between the other tape-shaped body and one tape-shaped body. Also,
By providing an arbitrary drain line on the conductive shield, terminal processing can be facilitated.

Next, this invention will be explained in more detail with reference to the drawings.

FIG. 1 shows an end view of an embodiment of a flat cable according to this invention. In the figure, a flat cable 1 is formed by installing a conductor 4 in the groove 2 of one tape-shaped body 3 having a plurality of grooves 2, and holding the conductor 4 by the other tape-shaped body 5. A conductive shield 6 is provided on the outside of one of the tape-like bodies 3 in close contact therewith.

In manufacturing this flat cable 1, one tape-shaped body 3 and the other tape-shaped body 5 are selected from resin films or tapes made of fluorine-based resin, polyester, polyimide, polyamide, etc., as required. It can be used as Also, grooves 2 may be provided in one tape-shaped body 3 in advance prior to cable manufacture, but between one tape-shaped body material having a somewhat wider width and the other tape-shaped body material having a narrower width, the groove 2 may be formed in advance. It is also possible to simultaneously feed a plurality of conductors and pass them between grooved rollers to achieve groove forming and cable production simultaneously. In this way, the conductive shield 6 is provided after manufacturing the flat cable main body, but the conductive shield 6 can also be applied at the same time as the main body is manufactured. As the shielding body 6, aluminum foil, a perforated copper plate, expanded metal, or the like can be used, with an adhesive provided on one side. Porous copper plates and expanded metals without adhesive can also be held together with other adhesive or fusible tapes.

Due to this structure, the shield 6 is connected to the conductor 4
In addition to preventing disturbances through electromagnetic shielding, crosstalk between lines can also be prevented. In order to completely prevent this crosstalk, groove 2
It is sufficient if the conductor is placed at the bottom of the deep groove. Alternatively, instead of forming a deep groove, a flat cable 8 may be used in which another ground conductor 7 is provided at an intermediate position between the conductors 4, as shown in FIG.

In this flat cable 8, 9 is a drain line that extends so as to be in electrical contact with the shield 6, and is used for grounding the terminal portion.

According to the flat cables 1 and 8 according to this invention, the shield 6 is disposed between the conductors 4 disposed in the groove 2 to isolate the conductors 4 from each other.
The shield 6 can not only prevent disturbance but also significantly prevent crosstalk between conductors. As shown in FIG. 2, by arranging the ground conductor 7 between the conductors 4 and facing each other, crosstalk between the conductors can be almost completely prevented.

Furthermore, since the flat cables 1 and 8 according to this invention have a convex-convex shape on one side, they can be placed back to back as shown in FIG. 3, and the transmission density can be greatly increased.

As mentioned above, according to this invention, multiple conductors and
By forming a plurality of juxtaposed grooves recessed only on one side to accommodate the plurality of conductors, one tape-shaped body forms a convex portion on the outside, and the plurality of grooves in this one tape-shaped body are closed. a flat cable comprising: the other tape-shaped body holding the plurality of conductors in the groove; and a conductive shield closely disposed outside the one tape-shaped body and located between the conductors. As a result, since the shield also blocks adjacent conductors, it is possible to economically provide a flat cable that not only prevents external disturbances but also prevents crosstalk between wires. Depending on the arrangement, such as forming deep grooves and reducing the groove interval, the transmission density can also be increased.

It should be noted that this invention is not limited to the above-mentioned embodiments, and it goes without saying that modifications can be made within the scope of the idea of this invention.

[Brief explanation of drawings]

1 and 2 are end views of flat cables showing different embodiments according to this invention, and FIG. 3 is an end view showing an example of the arrangement of the flat cable according to this invention. 1, 8...Flat cable, 2...Groove, 3...
...One tape-shaped body, 4... Conductor, 5... Other tape-shaped body, 6... Shielding body, 7... Grounding conductor, 9...
...Drain line.

Claims (1)

[Scope of utility model registration request] A plurality of conductors, one tape-shaped body forming a convex portion on the outside by forming a plurality of juxtaposed grooves recessed only on one side for storing the plurality of conductors, and a plurality of this one tape-shaped body. another tape-shaped member that closes the groove of the tape-shaped member and holds the plurality of conductors in the groove; and a conductive shield that is closely disposed outside the one tape-shaped member and located between the conductors. Tsuto cable.