JPH0430688B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a flat shielded ribbon cable that is wired to electronic equipment via a printed circuit board or a conductor insertion type one-touch connector.

[Conventional technology]

Conventionally, shielded ribbon cables include (1) shielded ribbon cables in which the signal transmitting conductor and the drain wire are not located on the same plane, as disclosed in Japanese Patent Application Laid-Open No. 124310/1983; ) As shown in Japanese Utility Model Publication No. 60-8339, a shielded ribbon cable is known in which a signal wire and a drain wire are manufactured separately, and a shield layer is provided on them in a subsequent process. There is.

[Problem that the invention seeks to solve]

In the conventional example (1) above, since the signal transmitting conductor and the drain wire are not located on the same plane, it is impossible to apply a conductor insertion type one-touch connector. This is because the pitch and depth of the slits formed in each contact of the connector are all the same, so the drain wire cannot be inserted into the slit of the contact. In the conventional example (2), the signal line and the drain wire are manufactured separately, and a shield layer is provided on them in a later process, which has the disadvantage of requiring a large number of manufacturing steps. The object of the present invention is to provide a shielded ribbon cable that advantageously solves the above-mentioned problems.

[Means for solving problems]

Multiple conductors 1, 1... for transmitting signals
A cable core 4 integrally extruded and coated with a common insulator 3 such that the cable cores are located parallel to each other and on the same plane at predetermined intervals, and a shield layer 5 provided on the outside of this cable core. , a retaining sheath 6 coated on the outside of this shield layer 5
and a part of the insulation coating 3 of the conductor located at the side edge of the cable core 4 is cut out in the length direction and exposed, and the conductor is brought into direct contact with the shield layer 5. This is a shielded ribbon cable characterized in that the drain wire 2 is constructed by using the following methods.

[Effect]

The plurality of signal transmitting conductors and the drain wire are held on the same plane by a common insulator, and the side surface of the drain wire is in direct contact with the shield layer.

〔Example〕

1 and 2 show a first embodiment of the present invention, in which a plurality of conductors 1, 1, . . . for transmitting signals and at least one conductor to become a drain wire 2 are shown. A cable core 4 is constructed by integrally extruding a common insulation coating 3, such as heat-resistant vinyl or polyethylene, so that the cable cores are located parallel to each other and on the same plane.

The conductor is made up of, for example, seven thin copper wires with an outer diameter of about 0.1 to 0.2 mm twisted together, and the surface of the twisted wires is coated with a tin plating layer. Further, as a conductor to become a drain wire, a portion of the insulating coating 3 of the conductor located at the side edge of the cable core is cut out and removed in the length direction to expose the conductor.

A shield layer 5 is further wound around the outside of the cable core 4 configured in this manner. This shield layer 5 is made by integrally laminating a metal foil, such as a copper foil or an aluminum foil, and a plastic film, such as a polyester film, and is wound so that the polyester film side is located on the outside.

Furthermore, a protective sheath 6, for example heat-resistant vinyl, is provided on the outside of the shield layer 5 by extrusion. At this time, a polyester film serving as a shield layer is integrally fused to the inside of this protective sheath 6.

When connecting a flat shielded ribbon cable constructed in this way to a printed circuit board or one-touch connector, both ends are exposed and each conductor and The drain wire is exposed.

That is, at both ends of the cable according to the present invention, the protective sheath 6 and the shield layer 5 are peeled off and removed over a certain width a, for example, about 2 mm, to provide an exposed portion of the insulator 3, and the exposed portion of the insulator 3 is removed. Each conductor 1, 1, . . . and the conductor 1 to become the drain wire 2 are exposed at the tip of the body over a certain length b, for example, about 3.5 mm.

Note that if a fragile adhesive is applied to the inner surface of the shield layer 5 in advance, the shield layer 5 and the cable core 4 will be bonded together, so that the holding sheath 6 will not lift up from the cable core 4, and both will be damaged. There is no relative movement. Furthermore, as shown in FIG. 3, the position of the notch in the insulation coating on the side surface of the drain wire 2 may be made horizontal.

FIG. 4 shows a second embodiment of the present invention, in which the cable core 4 is sandwiched between a tape-shaped shield layer 5 and a tape-shaped protective sheath 6 in a sandwich-like configuration. be. In this way, the cable can be manufactured without using an extrusion molding machine.

FIG. 5 shows a third embodiment of the present invention, in which the conductors 1, 1... and the drain wire 2 are each covered with independent insulation coatings 3A, 3B, 3C,... The insulators are heat-sealed or glued together.

With this configuration, it is easy to separate the wires into individual wires after the cable is led out at the terminal. Furthermore, by changing the colors of the insulators 3A, 3B, 3C, . . . in advance, a multicolored cable core can be obtained.

〔Effect of the invention〕

According to this invention, a plurality of conductors 1, 1, . It comprises a coated cable core 4, a shield layer 5 provided on the outside of the cable core, and a holding sheath 6 coated on the outside of the shield layer 5, and located on the side edge of the cable core 4. A part of the insulating coating 3 of the conductor is cut out in the length direction and exposed, and this conductor is brought into direct contact with the shield layer 5 to form the drain wire 2. (1) When the terminals of the cable are exposed and each conductor is made to protrude to a certain length, each conductor 1, 1... and the conductor 2 which becomes the drain wire are integrated, so the mutual positional relationship is No change occurs. Therefore, there is an effect that each conductor and drain wire can be inserted all at once in a conductor insertion type one-touch connector.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing a first embodiment of the present invention, Fig. 2 is a plan view of Fig. 1, and Fig. 3 is another example in which the position of the notch in the insulator on the side surface of the drain wire is changed. 4 is a cross-sectional view showing a second embodiment of the present invention, and FIG. 5 is a cross-sectional view showing a third embodiment of the present invention. In the figure, 1 is a conductor, 2 is a drain wire, and 3 is a conductor.
is an insulator, 4 is a cable core, 5 is a shield layer,
6 is a protective sheath.

Claims (1)

[Claims] 1. A plurality of conductors 1, 1 for transmitting signals...
A cable core 4 integrally extruded and coated with a common insulator 3 such that the cable cores 4 are arranged parallel to each other and on the same plane at predetermined intervals, and a shield layer 5 provided on the outside of this cable core. and,
A protective sheath 6 is provided on the outside of the shield layer 5, and a part of the insulating sheath 3 of the conductor located at the side edge of the cable core 4 is cut out in the length direction and exposed. A shielded ribbon cable characterized in that the drain wire 2 is constructed by bringing this conductor into direct contact with the shield layer 5. 2. The shielded ribbon cable according to claim 1, wherein the protective sheath 6 is formed by extrusion molding. 3. The shielded ribbon cable according to claim 1, wherein the cable core 4 is sandwiched between a shield layer 5 and a holding sheath 6 in a sandwich-like configuration. 4. The shield according to claim 1, wherein the shield layer 5 is formed by integrally laminating a metal foil and a plastic film, and the plastic film is fused to the protective sheath 6. ribbon cable.