KR970001951B1 - Flat cable branching and connecting process - Google Patents

Abstract

None.

Description

Method of forming branch connection of flat cable

1 is an enlarged perspective view of a branching structure of a flat cable formed by a method of forming a branching connection of a flat cable according to a preferred embodiment of the present invention.

2 to 5 are explanatory diagrams of processing steps of the flat cable for forming the structure of FIG.

6 is a perspective view of the flat cable of FIG.

7 is a perspective view of the flat cable of FIG.

8 is a perspective view of a common ground plate mounted on a flat cable under the machining conditions of FIGS. 5 and 7;

9 is a plan view of the structure of FIG.

10 is a cross-sectional view of the FIG. 1 structure taken along the line X-X.

11 is a plan view of a connection structure to a female connector of FIG.

12 is a side view taken along line XII-XII in FIG.

FIG. 13 is a bottom view taken along line XIII-XIII of FIG. 11;

14 is a cross-sectional view of a branch connection structure formed by a conventional cable connection method.

* Explanation of symbols for main parts of the drawings

1: Flat cable 3, 4, 5, 6: Signal line

3b-6b: folded projection of signal line 7-14: ground wire

7b-14b: Ground wire protrusion 15, 16, 17: Lead wire exposed portion

22: common ground plate 41a-46a: connection end

The present invention relates to a method for forming a branch connection of a flat cable, and more particularly, to a method for forming an electrical connection for connecting an intermediate portion of a high speed signal transmission cable to a contactor of a branch connection connector.

When connecting the intermediate portion of the high-speed signal transmission cable to the branch connection forming connector, as shown in FIG. 14, the cable is cut into two portions 101 and 102, and the two cable portions 101 ), (101), (101) lead wires (101a), (101b), (101c) of each cable (101), (102) of each cable (101), (102), and (102) ..., (102a), (102b), (102c), ... are exposed, and the pairs of corresponding lead wires (101a), (102a): (101c), (102c), ... are respectively To the ends of the contacts 105, 106, 107, ..., for example, by means of soldering or the like.

When the two signal transmission leads of each set of the high speed signal transmission flat cable are electrically connected to the connection end of the corresponding contactor according to the conventional branch connection formation method as described above, a plurality of signal lines and ground lines without insulation coating are complicated. Since they intersect with each other, short circuits and connection failures were likely to occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is to easily and reliably form a good branch connection of a flat cable, and to change the impedance at a branch connection of a transmission system by using a high speed signal or a very high frequency component. It is to provide a method which can be made small with respect to a signal that has.

According to the invention, the object is to remove the insulation of the flat cable in the transverse direction with respect to the flat cable in the three longitudinal portions of the flat cable, exposing the entire lead wire of the flat cable in this detail; Folding the flat cable at the lead wire exposed portion in the middle of the subdivision, projecting each of the grounding lead wires of the flat cable lead at the proximal surface side at the lead wire exposed portion, and for the signal in the lead wire of the flat cable at the lead wire exposed portion. A step of projecting the lead wire to the folded end side, and electrically connecting the grounding lead wires on both surfaces of the overlapping portion with the common ground lead wire connecting means on both surfaces thereof, the folded protrusion of the signal lead wire and the lead wire for common ground connection. Each of the means is electrically connected to the corresponding connection terminal of the branch signal output means. It is achieved by a method for forming a branch connection of a flat cable comprising the step of connecting.

According to the method of the present invention, each of the grounding lead wires of the flat cable is projected to the proximal surface side of the overlapping portion, and the grounding lead wires on both surfaces of the overlapping portion are electrically connected to the common grounding lead connecting means on both surfaces thereof. Since the lead wire exposed portion of the flat cable is projected to the folded end side in the folded state without cutting the signal lead wire of the flat cable, the ground lead wire and the signal lead Not only can the lead wires be reliably spatially separated, but only the signal lead wires protrude to the folded end side, so that there is little possibility of short circuit or poor connection between the signal lead wires, and good branch connection can be formed.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 to 13, (1) is a flat cable for signal transmission between a high speed signal processing device such as a computer or a peripheral processing device thereof, and a large number of the insulation or dielectric coating (2) of the flat cable (1). (Typically 50-60, but four cases are described to simplify the following description, which will be made with reference to the drawings), and the leads (3), (4), (5), (6) and Ground lead wires (7), (8), (9), (10), (11), and (12) twice as many as the signal transmission leads (3), (4), (5), and (6). , (13) and (14) are buried. In the flat cable 1, each signal transmission lead is arranged between a pair of grounding lead so that crosstalk between signals of each signal line can be suppressed.

First, in the middle part of the flat cable 1, the insulation coating 2 is removed from the equally spaced details 15, 16, and 17 in the longitudinal direction A of the flat cable 1. In the transverse direction B (see Fig. 6). The insulation coating 2 may be removed in five parts, seven parts, or more. For example, a laser such as a CO ₂ laser is used to remove the insulating coating, but any mechanical, chemical or thermal means can be used instead. E1, E2, and E3 are the exposure lengths of the lead wires in the portions 15, 16, and 17, and are usually E1 = E3, but E1 ≠ E3 may be used if necessary. In the case where the positions of the insulation coatings 18 and 19 can be adjusted in the longitudinal direction of the lead wires, the sizes of E1, E2, and E3 can be arbitrarily selected if E1 + E2 + E3 is the desired size.

By removing the insulating coating, all the insulating coating is removed from the portions 15, 16, and 17, and all the lead wires 3 to 6 and 7 to 14 are exposed.

Next, the insulation coating remaining portions 18, 19 and the insulation coating portions 20, 21 on both sides, and the lead wire exposure portions 15, 17 on both sides overlap, respectively (the exposure portion 15). , 17 may be shifted without overlapping), and the flat cable 1 is folded in the intermediate lead wire exposed portion 16. Next, the grounding lead wires 7 to 14 are cut at portions corresponding to the exposed portions 16.

The grounding lead wires 7 to 14 may be cut off before or after the folding, and at the same time, the insulation coating may be removed at the same time.

Next, the insulating coating 18 without cutting the folded ends 3a, 4a, 5a, and 6a of each of the signal lead wires 3, 4, 5, and 6, respectively. ) And (19) protrude in the F direction (see FIG. 5) to form electrical connections 3b, 4b, 5b, and 6b of the signal lead wire, and at the same time as FIG. And the ground lead wire portions 7a, 8a, 9a, 10a, 11a, 12a, 13a, and 14a of the exposed portion 15 located on the upper side in FIG. ) Is pulled to protrude upwards to form protrusions 7b to 14b for electrical connection, and the ground lead wire portion 7c of the exposed portion 17 located on the lower side in FIGS. 4 and 5. ) To (14c) is pulled downward to form protrusions 7d to 14d for electrical connection (lead portions 7c to 14c and 7d to 14d are similar to 7a to 14a and 7b to 14b, and thus not shown). ). Here, the folded electrical connecting portions 3b to 6b of the signal lead wire and the protruding connecting portions 7b to 14b, 7d to 14d of the ground lead wire are insulated and covered with the remaining portion 18 of the cable 1. ) And (19) to reliably isolate from each other.

In particular, when the protruding electrical connecting portions 3b, 4b, 5b, and 6b of the signal lead wire are formed, the insulating coatings 18 and 19 are attached to the insulating coatings 20 and 21. The folded portions 3a, 4a, 5a, and 5 of the corresponding lead wires 3, 4, 5, and 6 by moving in the G direction (see FIG. 6a) is pulled out in the F direction from the insulating coatings 18 and 19 without cutting.

As a result, the clearance 49 between the insulation coating remaining portions 18 and 19 and the insulation coating portions 20 and 21 is larger than the size E1 or E3 of the original exposure regions 15 and 17. It becomes much narrower, and there is little possibility that interference will arise between the signal leads 3, 4, 5, and 6 in this gap 49. On the other hand, when the protruding lead wire portions 7b to 14b and 7b to 14d for grounding are formed, the lead wire portions 7a to 14a are insulated from the cut ends 7e to 14e. The lead wire portions 7c to 14c are pulled at their cut ends 7f to 14f while simultaneously pulling in the G direction with respect to the insulating coating 18 until the end face 18a of the coating portion 18 is reached. Is pulled in the G direction with respect to the insulating coating 19 until the end face 19a of the insulating coating 19 is reached. In this connection, the cut ends 7e to 14e and 7f to 14f are preferably entered from the end faces 18a and 19a.

Subsequently, the flat cable 1 is folded and covered with a common grounding conductive cover 22 as a common ground lead wire connecting means.

The cover 22 is formed by, for example, punching or blanking a thin metal plate such as a copper alloy, and having a flat plate 23 and an insulating coating on the insulating coatings 18 and 20. It consists of the folded part 25, 26, and 27 between the flat part 24 and the both flat plate parts 23 and 24 located on the outer surface of (19) and (21). As the cover 22, a sheet-like member such as plastic having high electrical insulation even with a high frequency signal formed by forming a metal foil layer such as copper on one surface (outer surface) may be used. The flat plate portion 23 has openings 28 and 29 into which the ground protrusions 7b, 8b, 9b, 10b, 11b, 12b, 13b, and 14b are inserted. ), (30), (31), and (32) are formed, and the flat plate portion (24) has a projection (7d), (8d), (9d), (10d), (11d), and (12d) for grounding. The openings 33, 34, 35, 36, and 37 into which,, 13d, and 14d are inserted are formed. In addition, instead of inserting the grounding projections 8b and 9b into one opening 29, a small opening for inserting each of them separately may be provided in the flat plate portion 23. Corresponding grounding projections 7b to 14b and 7d to 14d inserted into the respective openings 28 to 39 are fixedly electrically connected to the openings 28 to 39 by soldering or the like. . In addition, both edge portions 23a, 24a, 23b, and 24b of the flat plate portions 23 and 24 are overlapping insulation coating portions 18, 19, 20, and 21. At the overlapping direction and at the same time prevents relative displacement in the direction along the overlapping surface of the insulating coatings 18, 20, 19, and 21 and prevents the signal lines 3, ( 4), (5), (6), etc., are firmly fixed to each other by means of welding or the like to prevent relative displacement. In addition, the insulating wire 49 may be filled with an electrically insulating resin before or during the mounting of the common ground cover 22 to fix the signal lines 3, 4, 5, 6, and the like. do. At least one of the connecting portions 25, 26, 27, for example, the connecting portions 25, 27 on both sides may be the protruding ends 25a, 27a of the connecting portions 25, 27. Connection end portions 41a and (42) of contacts 41 and 42 of the branch connection forming connector 50 as branch signal output means having recesses 41b and 42b having a complementary shape fitted with 42a), it is easily and securely electrically connected and fixed by suitable means such as soldering.

In addition, as shown by the virtual line in FIG. 9, the intermediate connection part 26 may also be electrically connected to another similar connection end part.

On the other hand, the protruding electrical connecting portions 3b, 4b, 5b, and 6b of the signal lead wire extend substantially parallel to each other so that a desired gap is formed therebetween, so that the contacts 41, 42 of Contact ends 43, 44, 45, 46 of contacts 43, 44, 45, 46 of the branch connection forming connector 50, such as the recesses 41b, 42b of the connection ends 41a, 42a. 43a, 44a, 45a, 46a are fitted into the recess 43b, 44b, 45b, 46b, and are easily and reliably electrically connected by soldering or the like. Further, the connection ends 43a to 46a electrically connected to the protruding electrical connecting portions 3b, 4b, 5b, and 6b of the signal lead wire may have other suitable coupling structures such as holes instead of recesses. do.

The intermediate or branch connecting portion 51 of the flat cable 1 constructed in the above-described manner is embedded in the resins 52 and 53 so as to be integrated with the connector 50 using a suitable molded type or the like.

Contactors 41, 42, 43, 44, 45 and 46 of the connector 50 are connected end portions 41a, 42a, 43a, 44a and 45a. ), There are female-type contact portions 41c, 42c, 43c, 44c, 45c, 46c (see also FIG. 11) on the opposite side to 46a. In addition, 54a, 54b, etc., the contacts of the male-type connector 55 (refer FIG. 10) fitted with the female contact 41-46 of the connector 50 are shown. Indicates.

In the above, the connector 50 as the branch signal output means has been described as the female connector, but the branch signal output means may be a male connector or any other signal output mechanism.

Claims (1)

Removing the insulating sheath of the flat cable from the three longitudinal sections of the flat cable in a transverse direction with respect to the flat cable to expose the entire lead of the flat cable in this subdivision; The step of folding the flat cable in the step, projecting each of the ground lead wire of the flat cable lead at the adjacent surface side in the exposed lead wire portion, and the signal lead wire of the lead cable of the flat cable folded in the lead wire exposed portion Projecting to the folded end side, electrically connecting the grounding lead wires on both surfaces of the overlapping portion with the common grounding lead connecting means on both surfaces thereof, the folded projections of the signal lead wires, Electrically connect each of them to the corresponding contact terminal of the branch signal output means. Method for forming a branch connection of a flat cable comprising the step.

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