JPH07272779A - Coaxial wire support / grounding structure - Google Patents

Abstract

(57) [Abstract] [Purpose] The effect of high heat during the soldering process on the metal tape wrapped around the holder that inserts the exposed core of the coaxial wire is reduced, and the processing length of the shielded wire is also short. To provide a supporting and grounding structure for coaxial lines. [Structure] A holder made of an insulating material having a side opening-shaped cutout for inserting the exposed insulating core of the coaxial wire, and a side opening of the cutout of the holder for pressing and supporting the insulating core in the holder. A heat-resistant resin tape wound so as to close the metal tape, a metal tape wound on the heat-resistant resin tape, and a soldering means for conducting the shielded wire separated from the coaxial wire on the metal tape for conduction. With.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a probe cable
The present invention relates to a structure for supporting coaxial wires and grounding them when terminating an assembly called a 3 connector.

[0002]

2. Description of the Related Art A probe cable is a cable in which a large number of coaxial wires are assembled, and each coaxial wire is formed by twisting seven silver-plated copper alloy wires (size: 0.04 mm ² ) as shown in FIG. Foamed PFA 2 is applied on the conductor 1 made of a wire to a layer thickness of 0.16 mm, and PPS + PET skin tape 3 is applied to the surface thereof to a layer thickness of 0.012 mm to form an insulating core 4, and 0 is formed on the insulating core. A shield wire layer 5 of 0.0254 TA and a press winding layer 6 of PET tape are sequentially provided.

Thus, the terminal of the coaxial line, which is to be multi-taken, is terminated as shown in FIG. That is, first,
As shown in (a), a connector housing 7 in which partition slots 7a are vertically and horizontally arranged is prepared.
Terminals 8a attached to the grounding conductor 8 in the four corner slots of a
Is inserted and stored, and the grounding conductor 8 is raised from the connector housing 7. Next, as shown in (b), the terminals 10 are attached to the ends of the insulating cores 4 exposed by each of the multiple coaxial wires 9, and the terminals of the respective coaxial wires are connected to the remaining slots of the connector housing. Insert and store.

Next, the holder 11 as shown in FIG. 4 is used to support and ground the coaxial wire. That is, the holder 11 is
Molded product such as phenolic resin containing glass, the notch 13 with the side opening 12 is formed at the side edge of the main body formed into a rectangular plate shape having a long width of 20 mm and a short width of about 2.5 mm at predetermined intervals. Are formed in large numbers. This holder 11
2 is arranged on the connector housing 7 while being inserted between the rows of the insulating cores 4 assembled in two rows and standing up as shown in FIG. 2C, and the four notches 13 are provided for grounding. By inserting the conductor 8 and the insulating core 4 in the remaining notches, a large number of insulating cores that are grouped in rows are supported at regular intervals.

Next, as shown in FIG. 2D, the holder 11
A conductive metal tape 14 made of copper or the like is wound around the side edge of the insulating core 4 to close the side opening 12 of the notch 13.
And a press winding for preventing the grounding conductor from coming off from the cutout, while folding back the shielded wire 5'exposed of the coaxial wire on the metal tape 14, and
As shown in (e), the metal tape 15 is further wound around the metal tape 14 and the folded back shielded wire 5'to hold down the shielded wire 5 ', and finally, as shown in (f), the surplus of the grounding conductor 8 is left over. The terminal and the surplus terminal of each shield wire 5'are further folded back on the metal tape 15, and the surplus terminal is soldered to the metal tape 15, and thus the metal tape of the grounding conductor 8 and each shield wire 5 '. The conduction process is performed through the.

[0006]

The above-mentioned conventional grounding / supporting structure of the coaxial line has the following problems. That is,
As shown in FIG. 5, since the side opening of the notch of the holder 11 through which the exposed insulating core 4 of the coaxial wire 9 is inserted is directly closed by the metal tape 14, the metal tape further wound thereon. The high heat at the time of the soldering process 17 on 15 is transmitted to the metal tapes 15 and 14, and the foamed insulator of the insulating core 4 passed inside melts out as shown by reference numeral 17 due to the influence of the high heat, causing a cross-link defect. I was afraid. Further, since the shielded wire 5'is folded back on the inner metal tape 14 and further folded back on the outer metal tape 15, the exposed length of the shielded wire is increased, so that it takes time when the insulating core is pulled. The shield wire could not play the role of a tension member, which in turn exerted a force on the conductor (38AWG) of the insulating core, possibly causing a disconnection failure.

Therefore, in order to solve the above-mentioned problems of the prior art, the present invention has an influence of high heat at the time of soldering processing to a metal tape wound around a holder for inserting a bare insulating core of a coaxial wire. It is an object of the present invention to provide a support / grounding structure for a coaxial wire, which can reduce the processing cost of the shielded wire and shorten the processing length.

[0008]

SUMMARY OF THE INVENTION A coaxial wire supporting / grounding structure provided by the present invention is made of an insulating material having a side opening-shaped cutout for inserting an exposed insulating core of the coaxial wire. A holder, a heat-resistant resin tape wound so as to close the side opening of the notch of the holder to hold and support the insulating core in the holder, and a metal tape wound on the heat-resistant resin tape, This metal tape has a soldering means for conducting the shielded wire which is separated and separated from the coaxial wire,
Even if high heat is applied during the soldering process performed on the metal tape, the heat-resistant resin tape under the metal tape receives the high heat, which in turn greatly reduces the heat effect on the insulating core of the coaxial wire, The insulation of the insulating core is prevented from melting. Also, the shielded wire can be folded back onto the metal tape on the heat-resistant resin tape and used for soldering, so that the exposed length of the shielded wire can be shortened and, in turn, when a tensile force is applied to the coaxial wire. It is possible for the shielded wire to function as a tension member.

The metal tape is preferably a copper tape because it is required to have electrical conductivity and appropriate flexibility to be wound around the side edge of the holder. On the other hand, a preferable specific example of the heat-resistant resin tape is made of aromatic polyimide or aromatic polyamide, the former is provided with a product name of, for example, "Kapton", and the latter is provided with a product name of, for example, "Nomex". It is provided by.

The heat-resistant resin tape is made wider than the metal tape, and by winding the metal tape on the inner surface of both side edges of the heat-resistant resin tape, the side edges of the metal tape are insulated from the coaxial line. It is desirable to avoid touching the core directly.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a preferred embodiment of a coaxial wire support / grounding structure according to the present invention. The same parts as those in FIGS. Please also refer to the above description concerning them.

In this embodiment, first, the heat-resistant resin tape 21 is wound around the side edge of the holder 11 made of an insulating material so that the side opening 12 in the notch 13 of the holder (see FIG. 4). Is directly closed, so that the insulating core 4 of the coaxial wire which is inserted into the notch is surrounded and supported by the holder 11 and the heat-resistant resin tape 21. While the metal tape 22 made of copper is wound around the heat-resistant resin tape 21, the shield wire 5 ″ separated from the coaxial wire 9 is pulled out from the side opening 12 of the notch of the holder 11 while the heat-resistant resin tape 21 is being pulled out. It is folded back to the upper side of the metal tape 22 via the side edge of 21, and the metal tape 2
2, the end of the shield wire 5 ″ is soldered 23.

The heat-resistant resin tape 21 is formed by extruding a heat-resistant synthetic resin such as an aromatic polyimide known under the trade name of "Kapton" or an aromatic polyamide known under the trade name of "Nomex" into a tape shape. It is obtained by molding and its width is wider than the width (3.0 mm) of the metal tape 22 (3.8 mm (“Kapton” tape: thickness: 5
0 .mu.m)), and the metal tape 22 is wound around the inner surfaces of the side edges on both sides.
By doing so, the side edge of the metal tape 22 and the insulating core 4 of the coaxial wire 9 are separated from the surface of the heat-resistant resin tape 21 (a part of the wide surface is 0.4 mm wide) and the side edge. Since the insulation tapes face each other via the insulation creepage distance via the (edge), the side edges of the metal tape 22 are improved so as not to directly contact the insulation core 4 and cause insulation failure.

The effect of the soldering treatment 23 of the coaxial wire supporting / grounding structure in the present embodiment was compared by a breakdown voltage test to confirm its effect. The coaxial line 9 is shown in FIG.
The size shown in (the size is 50 PF / m, 38 in the figure
AWG is adopted), and the arrangement (size and positional relationship refer to dimensions in the drawing) as shown in FIG. 1 is adopted. The metal tape 22 is a copper tape, and the heat resistant resin tape 21 is a “Kapton” tape. As a comparative example, the same coaxial line was used to arrange as shown in FIG. 5 (for the size and the positional relationship, see the dimensions in the drawing). A copper tape was used as the metal tape. Looking at the test results, in the case of this example, Min. 1.2 kV, Ave. It showed a very stable voltage characteristic of 1.62 kV. In that respect, in the comparative example, Mi
n. 0.25 kV, Ave. The variation was 1.15 kV and was unstable. As is clear from the test results, according to the structure of this example, the heat resistance was excellent, and the cross-linking failure due to the melting of the insulator could be prevented. Since it is subjected to the soldering process on the metal tape 23, the withdrawal length of the shielded wire 5 ″ can be shortened and it can be expected as a tension member, so that an excellent tensile resistance can be obtained.

[0015]

According to the coaxial wire support / grounding structure of the present invention, the side opening of the notch of the holder through which the exposed insulating core of the coaxial wire is inserted is directly closed with a heat-resistant resin tape, Since the metal tape is wrapped around the heat-resistant resin tape and the shield wire is soldered on the metal tape, the heat-resistant resin tape directly receives the high heat during the soldering process, and the coaxial wire is exposed to the insulating core. It is possible to alleviate the thermal effect of the above, and eventually achieve the intended purpose of preventing the insulator of the insulating core from melting, and it is possible to provide a coaxial wire termination processing section with electrically stable characteristics without cross-talk defects. . Also, since the shielded wire could be used for soldering on the metal tape by only folding it once, the shielded wire can be shortened to function as a tension member, and also in terms of pulling resistance performance. It will be excellent.

[Brief description of drawings]

FIG. 1 is an explanatory cross-sectional view of an essential part showing an embodiment of a coaxial wire support / grounding structure according to the present invention.

FIG. 2 is an explanatory cross-sectional view showing the structure of a coaxial wire.

FIG. 3 shows a conventional example of a termination procedure for a multi-take coaxial wire, (a) is an explanatory view of a mounting state of a grounding conductor with a terminal, and (b) is an insulating core of a coaxial wire with a terminal. An explanatory view of the mounting situation, (c) an explanatory view of the holder setting situation, (d) an explanatory view of the first metal tape winding situation, (e) an explanatory view of the second metal tape winding situation, (f) ) Is an explanatory diagram of the soldering processing status.

FIG. 4 is an explanatory perspective view showing an example of a holder.

FIG. 5 is an explanatory cross-sectional view of main parts showing an example of a coaxial wire support / grounding structure in the related art together with problems.

[Explanation of symbols]

 4 Insulating Core 5 ″ Shielded Wire 9 Coaxial Wire 11 Holder 12 Side Opening 13 Notch 21 Heat Resistant Resin Tape 22 Metal Tape 23 Soldering Processing Section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masashi Omori 880, Sunazawa, Hitachi, Hitachi Ibaraki Hitachi Cable Assembly Co., Ltd.

Claims (3)

[Claims] 1. A holder made of an insulating material having a side opening-shaped cutout for inserting an exposed insulating core of a coaxial wire, and a side of the cutout of the holder for pressing and supporting the insulating core in the holder. -Resistant resin tape wound so as to close the opening on one side, a metal tape wound on this heat-resistant resin tape, and a soldering means for conducting the shield wire separated from the coaxial tape and separated from the metal tape. Coaxial wire support characterized by having
Ground structure. 2. The coaxial wire supporting / grounding structure according to claim 1, wherein the heat-resistant resin tape is made of aromatic polyimide or aromatic polyamide, and the metal tape is made of copper. 3. The coaxial cable support according to claim 1, wherein the heat-resistant resin tape is wider than the metal tape, and the metal tape is wound on a surface inside both side edges of the heat-resistant resin tape.
Ground structure.