JPH0357586B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connector for a multicore flat cable.

To connect a multi-core flat cable having a large number of parallel core wires in a flat strip-shaped sheath, a one-shot pressure welding method is generally adopted in which the multi-core flat cable is pierced with a contact, and the core wires are press-fitted between the contact pieces of the contact and captured.

Therefore, when connecting flat cables, in order to prevent crosstalk between core wires that are parallel to each other at minute pitches, one of the adjacent core wires is often used as a signal wire and the other as a ground wire. taken. In order to form this grounding mode, many flat cables are provided in which dedicated grounding core wires are arranged between each signal core wire.

Conventionally, as a means for short-circuiting such a core wire for grounding, for example, a means for exposing the core wire used for grounding from the cable end and soldering it to a short bar,
Alternatively, a method has been proposed in which a connecting contact plate made of a common base material is prepared, the connector is equipped with this plate, and a core wire used for grounding is captured.

The former method is very complicated, and if the connector is used to press the connector and strip the core wire at a location other than the terminal end of the cable, there is a risk that the cable will be cut.

When using the latter connection contact, it is necessary to prepare a special multiple-structured contact in addition to the pressure contact that captures the signal core wire. In addition, pitch conversion is not possible, there is a lack of compatibility, and it is not possible to accommodate core wires and connectors of each pitch, making it impossible to apply normal press-fitting of contacts.

Furthermore, when separate contacts are used, it is essential to include a short-circuiting part that connects each contact, and a mechanism for holding the part in the contact.

Therefore, the present invention is capable of capturing the core wire for grounding and detecting the short-circuited state without adopting a structure in which the above-mentioned connecting contacts are mounted on the connector, and without using a mechanism for holding the short-circuited part in the contact. It is possible to form this in a pressure welding connector for a flat cable, and as a means for doing so, the pressure welding connector is provided with an insulating board having a hole through which at least a signal contact is inserted, and the opening surface of the insulating board is A conductive layer is integrally formed on the conductive layer using plating or the like, and a contact that captures the grounding core wire is arranged so as to be always short-circuited to the conductive layer, and a contact that captures the grounding core wire is arranged so that it is always short-circuited to the conductive layer. As a configuration in which the conductive layer is placed in a non-conductive state, the grounding core wire is captured by the grounding contact at the same time as the pressure welding, and the grounding contact is short-circuited using the conductive layer as a medium, and the signal contact is The signal core wire can be captured accurately.

Also, depending on the implementation, the conductive layer is arranged so that it becomes conductive when at least one of the signal contacts penetrates the insulating board, so that the contact can be dropped to the ground line of the wiring board as a common ground contact. This is what I did. In addition, when the conductive layer is integrally provided on the opening surface of the signal contact insertion hole of the insulating board, a part of the conductive layer is connected to the inner circumferential wall of the press-fitting hole of the ground contact and the common ground contact insertion hole. The conductive layer is provided so as to extend on the inner circumferential wall of the hole, and each contact and the conductive layer are reliably connected by pressure welding when press-fitting the grounding contact and inserting the common grounding contact.

The drawings illustrate a flat cable connector manufactured in accordance with the spirit of the invention described above.

The same embodiment will be described in detail below.

1 indicates a signal contact, and 2 indicates a ground contact. Both contacts press fit each core wire extending through the sheath of the flat cable and into the sheath between the contact pieces and elastically capture it. Such a contact has a pointed tip and has at least two pressure contact pieces arranged in parallel, forming a gap for press-fitting the core wire between the contact pieces. The illustrated contact has three pressure contact pieces arranged in a staggered manner, and the conductive wire is press-fitted and captured so as to pass between the first and second contact pieces and between the second and third contact pieces.

Both contacts 1 and 2 are connected to each other at their bases and have implants 8 and 9 at the connecting portions. The signal contact 1 is implanted into the connector block 6 through the implantation portion 8 at the same pitch as the signal core wire 4 of the flat cable 3, and a male or female connector extends from the implantation portion 8 to the side opposite to the signal contact 1. The contact 7 extends into the implant hole or projects out of the hole.

The other connector is provided with an insulating board 10 having a contact insertion hole 12 through which the signal contact 1 passes, and the grounding contact 2 is planted in the insulating board 10 at the same pitch as the grounding core wire of the flat cable 3. . Reference numeral 17 indicates a press-fitting hole into which the grounding contact is planted.

A conductive layer 11 is provided on the surface of the insulating board 10 through which the signal contact 1 is inserted, that is, the surface on which the ground contact 2 is to be planted. The conductive layer 11 is placed in electrical continuity with the grounding contact 2, and is placed so as to be separated from the contact insertion hole 12 through which the signal contact 1 is passed.

In this embodiment, in order to achieve common grounding in at least one of the signal contacts 1, the conductive layer 11 is arranged so as to reach at least one of the contact insertion holes 12, for example, the contact insertion hole 12' at the end of the row.

As shown in FIG. 2, the insulating board 10 having the ground contact 2 is stacked on the connector block 6 having the signal contact 1, and the signal contact 1
is inserted into the contact insertion hole 12 of the insulation board 10. As a result of this insertion, the signal contacts 1 in the end row are inserted into the contact insertion holes 12' and are electrically connected to the conductive layer 11, and electrically connected to all the grounding contacts 2 using the conductive layer 11 as a medium.

That is, contact 1' forms a common ground contact. The other signal contacts 1 are not electrically connected to the conductive layer 11. The common grounding contact 1' uses a male or female contact as a common grounding output end.

As shown in FIGS. 6 and 7, in order to ensure electrical continuity between the ground contact 2 and the common ground contact 1' and the conductive layer 11, the conductive layer 11 is
1 is disposed over the inner peripheral wall of the hole 12' through which the grounding contact 1' is inserted and the hole 12' through which the common grounding contact 1' is inserted. The conductive layer portion disposed on the inner wall of the hole is pressed into contact with the implanted portion 9 of the grounding contact 2 and the common grounding contact 1'. For this purpose, the common grounding contact 1' is tightly inserted into the hole 12'.
The other signal contacts 1 may be loosely inserted into the holes 12. The arrangement of the conductive layers as described above is formed, for example, by plating.

In FIG. 1, the conductive layer 11 is formed on the surface of the insulating board 10 on the side from which the signal contact 1 is projected, but it can be formed on the surface on the side into which the signal contact 1 is inserted.

As shown in FIG. 2, a signal contact 1 and a common grounding contact 1' are inserted into the insulation board 10.
and grounding contacts 2 are protruded from the surface of the insulating board 10 at the same height in a staggered arrangement and are provided for pressure contact with the flat cable.

As shown in FIG. 3, the flat cable 3 is held between the cable holding cover 13 and the cable holding plate 14 and pushed into the contacts 1, 1', and 2.
The cable holding plate 14 has contact insertion holes that allow the contacts 1, 1', and 2 to pass through, and the cable holding plate 13 has contacts that receive the tips of the contacts 1, 1', and 2 that have passed through the cable holding plate 14. It has a receiving hole 15.

The cable holding plate 13 and the cable holding plate 14 are stacked on the insulation board 10 while holding the cable,
Contact 1 passing through cable holding plate 14,
1' and 2 pass through the flat cable 3, the ground contact 2 captures the ground core wire 5, and the signal contacts 1 and 1' capture the signal core wire 4.

Therefore, the grounding core wire 5 becomes short-circuited via the grounding contact 2 and the conductive layer 11. Further, the core wire 4' captured by the common grounding contact 1' is used as a common grounding bus.

In order to maintain the core wire gripping state, connector holding plates 16 are extended from both ends of the cable holding cover 13 along the side surfaces of the insulating board 10 and the connector block 6, and are engaged with the side surfaces of the connector block.

As the engagement means, for example, the connector block 6
A protrusion 19 is formed on one side of the connector holding plate 16, and a recess 18 is formed on the other side, so that the two are elastically engaged. The cable holding plate 14 is fitted between the connector holding plates 16 to hold the cable.

Although the embodiment has been described with respect to a case in which a dedicated grounding wire 5 is provided, in a flat cable having only a signal core wire, the coaxial wires may be used alternately for grounding and signal wires.

As explained above, the present invention is a connector equipped with a large number of contacts that pierce a multicore flat cable, capture the core wires, and establish a connection. By arranging the signal contacts that are inserted through the insulation board so that they are electrically conductive, and the signal contacts that are inserted through the insulation board so that they are not electrically conductive with the electrically conductive layer, the grounding core wire of the flat cable can be captured and short-circuited. Pressure bonding can be achieved simultaneously and accurately through the conductive layer of the insulating board.

It is only necessary to plate a conductive layer on the insulating board into which the signal contacts are inserted before implanting the contacts, and it is not necessary to incorporate shorting members etc. during contact assembly, making it easy to create a short circuit mechanism inside the connector. The structure can be simplified, and the reliability is significantly increased.

In addition, a common grounding contact can be easily formed by simply arranging the signal contacts so that they are electrically connected to the conductive layer when they penetrate the insulating board, and the grounding mechanism can be freely configured by setting the conductive layer pattern. can be formed. Further, according to the present invention, there is an advantage that there is no need to prepare a connecting contact having a special structure. In addition, if the grounding contact is press-fitted into the press-fitting hole of the insulation board, the press-fitting part of the grounding contact will be pressed into contact with the conductive layer part that spans the inner peripheral wall of the hole, and all the grounding contacts will be connected through the conductive layer. A short circuit mechanism can be formed reliably and easily.

Similarly, when the insulation board is stacked on the connector block,
A common grounding contact formed by at least one of the signal contacts is press-contacted to a conductive layer portion formed across the inner circumferential wall of an insertion hole provided in the insulating board, and the common grounding of the short circuit mechanism of all the grounding contacts is ensured. Moreover, it can be easily formed.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is an exploded perspective view showing a part of a connector block having signal contacts and an insulating panel having ground contacts; FIG. 2 is an assembled perspective view of the same; Fig. 3 is an enlarged perspective view of a part of the external appearance of the pressure welding connector when the above assembly is crimped using a cable holder cover, and Fig. 4 is an enlarged view of a part of the cable holder cover. 5 is a sectional view taken along line C-C in FIG. 3, and FIG. 6 is a sectional view taken along line A in FIG. 1.
-A sectional view, and FIG. 7 is a BB sectional view in FIG. 1...Signal contact, 2...Grounding contact, 3...Multicore flat cable, 4...Signal core wire, 5...Grounding core wire, 6...Connector block, 1
0... Insulation board, 1... Conductive layer, 12... Contact insertion hole, 13... Cable holding cover, 15... Contact receiving hole.

Claims (1)

[Claims] 1. The signal contacts 1 are implanted in the connector block 6 at the same pitch as the signal core wires 4 of the flat cable 3, and the insulating board 10 is provided with a contact insertion hole 12 through which the signal contacts 1 pass through. The grounding contact 2 is press-fitted into the press-fit insertion hole 17 of the panel 10 at the same pitch as the grounding core wire of the flat cable 3, and the insulating panel 10 is further provided with an opening for the signal contact insertion hole 12. A conductive layer 11 is integrally applied to the surface, and the conductive layer 11
is arranged over the inner circumferential wall of the hole 12' through which the common grounding contact 1' formed by the press-fitting hole 17 of the grounding contact and at least one of the signal contacts is inserted, and the other signal contact 1 is inserted.
The grounding contact 2 is disposed in a conductive layer portion disposed on the inner peripheral wall of the press-fitting hole 17 of the insulating board 10. When the insulating board 10 is stacked on the connector block 6, the common grounding contact 1 is placed on the conductive layer portion arranged on the inner peripheral wall of the common grounding contact insertion hole 12' of the insulating board 10. A connector for a flat cable, characterized in that a conductive state is achieved by inserting and pressure-welding the connector.