JP2001084850A - Terminal-worked coaxial cable and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal-worked coaxial cable enabling the occurrence rate of defects to be lowered to reduce its cost and provide its manufacturing method. SOLUTION: In this terminal-worked coaxial cable, coaxial cable bodies 1 are trimmed at least at one end E, shield layers 3 and dielectric layers 4 are bared, the bared shield layers 3 are put between and covered with metallic ground bars 5, and the bars 5 are fixed to each other by soldering so as to extend over the layers 3 and the layers 4 ranged at fixed pitches. Cut ends of the layers 3 exist substantially inside the bars 5 without projecting therefrom to the outside. According to the manufacturing method, portions of coverings 9 near the trimmed end parts E are removed to bare the layers 3, the layers 3 are cut down to a fixed length to bare the layers 4, the bared layers 3 are put between and covered with the bars 5 substantially without causing their cut ends to project from the bars 5, and the bars 5 are fixed to each other with solder 6 so as to extend over the layers 3 and the layers 4 ranged at fixed pitches.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal-processed micro coaxial cable for high-speed transmission suitable for applications such as a liquid crystal display of a personal computer, a small communication terminal, and internal wiring of electronic equipment, and a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, with the spread of various small electronic devices such as personal computers, it has become necessary to wire a plurality of coaxial cables in a narrow space so as to match a characteristic impedance with high accuracy. Is coming.
In order to cope with such a demand, the outer conductor (shield layer) of each of the plurality of coaxial cables is reliably grounded, and the center conductor is accurately connected to a connector terminal having a predetermined pitch or a circuit of a board. The need is emerging.
For this purpose, a plurality of coaxial cables are arranged at a predetermined pitch, and a flat cable that is taped together is used.
Batch connection is being performed,
As the coaxial cable becomes thinner, problems such as a decrease in the strength of the connection portion have arisen. As means for solving such a problem, a shield layer is exposed near the ends of a plurality of coaxial cables, two sets of ground bars (metal foil) are fixed to the shield layer by soldering, and the middle of the two sets of ground bars is fixed. The shield layer is cut by bending the cable with the fulcrum as the fulcrum, and then the shield layer is removed together with the metal ground bar on the end side to expose the insulating layer (dielectric layer).
After fixing the pitch of each insulating core by fusing a plastic tape to this insulating layer, the insulating layer is cut by laser light,
The center conductor is exposed by shifting in the direction in which the insulating layer at the end is peeled off, and the end side is cut off from the plastic tape,
A technique of applying a solder coating process to the end of the center conductor has been proposed (JP-A-10-144145).

However, in such a conventional technique, since the metal ground bar is fixed on the exposed shield layer by solder near the ends of the plurality of coaxial cables, the solder is transferred from the metal ground bar to the shield layer. Two sets of these metal ground bars that have flowed out, bend the cable around the middle point, cut the shield layer, and then remove the shield layer together with the metal ground bar on the end side Therefore, as shown in FIG. 5, the solder 6 including the shield layer 3 such as the horizontal winding shield protrudes from the end surface S of the metal ground bar 5 left on the plurality of coaxial cables 1. Therefore, it is difficult to connect to the connector, and in the case of using for a high voltage application, a current leaks between the shield layer 3 and the center conductor 8. , There is also that insulation failure occurs,
The defect occurrence rate reached as high as 30 to 40%. Moreover, 2
Use a pair of metal ground bars, one of
Since the set is removed and discarded together with the shield layer, the cost is increased.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, has no protruding shield layer from the metal ground bar, does not protrude the solder, and has a very clean metal ground bar end face. Connection to the shield layer and insulation failure between the shield layer and the center conductor can be greatly reduced, and only one set of metal ground bar is used. An object of the present invention is to provide a terminal-processed coaxial cable capable of reducing costs and a method for manufacturing the same.

[0005]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have found that a shield layer is provided near a cut end of a coaxial cable body in which a plurality of coaxial cables are aligned. When a metal ground bar is provided on the remaining dielectric layer, only one set of the metal ground bar is used, and the cut end of the shield layer is substantially inside the metal ground bar and protrudes outside the metal ground bar. It was found that there was no need, and the present invention was completed.

That is, according to the present invention, there are provided the following terminal-processed coaxial cable and a method for manufacturing the same. (1) At least one end of a coaxial cable body formed by arranging a plurality of coaxial cables is cut, and a jacket is removed near the cut end to expose a shield layer. Terminal processing, in which the dielectric layer is exposed by being cut to length, and the exposed shield layer is sandwiched between metal ground bars and covered, and is fixed by soldering over the shield layer and the dielectric layer at a predetermined pitch. The coaxial cable according to claim 1, wherein the shield layer cut end is substantially inside the metal ground bar and does not protrude outside the metal ground bar. (2) The length from the jacket removal part to the shield layer cut end is
The terminal-processed coaxial cable according to the above (1), which is shorter than the width of the metal ground bar. (3) The processed coaxial cable according to the above (1) or (2), wherein the dielectric layer is a fluororesin. (4) In the vicinity of the cut end of the coaxial cable, the dielectric layer is removed, and the exposed central conductor is overcoated with solder (1), (2).
Or the terminal-processed coaxial cable according to (3). (5) The terminal-processed coaxial cable according to (4), wherein the center conductor end is fixed and protected at a predetermined pitch by a fixing member. (6) The terminal-processed coaxial cable according to (5), wherein the fixing member is an adhesive tape. (7) The above (1) to (6), wherein the plurality of coaxial cables are colored in different colors for identification.
A terminal-processed coaxial cable according to any one of the above. (8) At least one end of a coaxial cable body obtained by aligning a plurality of coaxial cables is cut, a jacket is removed near the cut end to expose a shield layer, and the shield layer is cut to a predetermined length. Cut to expose the dielectric layer, cover the exposed shield layer by sandwiching it with a metal ground bar in a state where the cut end does not substantially protrude from the metal ground bar, and cover the shield layer and the dielectric layer at a predetermined pitch. A method for manufacturing a terminal-processed coaxial cable, comprising fixing by swaging solder. (9) The length from the jacket removal part to the shield layer cut end is
The method for manufacturing a terminal-processed coaxial cable according to the above (8), wherein the width is shorter than a width of the metal ground bar. (10) The above (8) or (9), wherein the shield layer is separated from the dielectric layer, the shield layer is fixed to a fixing member, and the shield layer is separated from the dielectric layer and cut to a predetermined length. Manufacturing method of terminal processed coaxial cable. (11) cutting the shield layer to a predetermined length to expose the dielectric layer, aligning the shield layer and the dielectric layer, fixing the dielectric layer at a predetermined pitch with a fixing member, Next, the shield layer is covered with a metal ground bar so that the cut end thereof does not substantially protrude from the metal ground bar, and is soldered at a predetermined pitch over the shield layer and the dielectric layer. The method for manufacturing a terminal-processed coaxial cable according to any one of the above (8) to (10). (12) irradiating the dielectric layer on the tip side of the metal ground bar with laser light to cut and remove the dielectric layer;
The method for producing a terminal-processed coaxial cable according to any one of the above (8) to (11), wherein the exposed center conductor is overcoated with solder. (13) The dielectric layer on the distal end side of the metal ground bar is fixed with a fixing member, and the dielectric layer is cut by irradiating a laser beam between the metal ground bar and the fixing member or on the fixing member. Then, by pulling out the fixing member, a plurality of dielectric layers are removed at a time.
2) A method for producing a terminal-processed coaxial cable according to the above. (14) The method according to any one of the above (8) to (13), wherein the dielectric layer is a fluororesin. (15) The above-mentioned (12) to (14), wherein the center conductor end is fixed and protected at a predetermined pitch by a fixing member.
The method for producing a terminal-processed coaxial cable according to any one of the above. (16) The above (10), wherein the fixing member is an adhesive tape,
(11) The method for producing a terminal-processed coaxial cable according to (13) or (15).

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a partially cutaway perspective view showing an example of a terminal-processed coaxial cable of the present invention.
Is a plan view of the same. 1 and 2, one end E of a flat cable F in which a plurality of coaxial cables 1 are aligned and fixed with an adhesive tape 2 is cut, and the cut end is cut.
In the vicinity of E, the jacket is removed to expose the shield layer 3, and further, the shield layer 3 is cut to a predetermined length to expose the dielectric layer 4, and the exposed shield layer 3 is connected to the metal ground bar. 5 and is fixed with solder 6 over the shield layer 3 and the dielectric layer 4 at a predetermined pitch.

In this case, in the present invention, it is necessary that the cut end of the shield layer 3 exists substantially inside the metal ground bar 5 and does not protrude outside the metal ground bar 5.
If the shield layer 3 protrudes outside the metal ground bar 5, the protruding shield layer itself will not only obstruct the connection of the connector, but also cause poor insulation between the shield layer 3 and the center conductor. Is covered with the metal ground bar 5 and is fixed on the shield layer 3 at a predetermined pitch with the solder 6, the solder 6 travels down the shield layer 3 and flows out of the metal ground bar 5 to be solidified. However, the protruding solder is also unsuitable because it causes a failure in connection to the connector and an insulation failure between the shield layer 3 and the center conductor, resulting in a high failure rate.

Here, the fact that the cut end of the shield layer 3 is "substantially" present inside the metal ground bar 5 and does not protrude outside the metal ground bar 5 means that the cut end of the metal ground bar 5 is cut off from the shield layer 3 cut side end surface. This means that the length of the protruding shield layer 3 is 0.2 mm or less, preferably 0.1 mm or less, and more preferably no projection. Even if the cut end of the shield layer 3 protrudes outside the metal ground bar 5, if it is 0.2 mm or less, the solder 6 hardly protrudes and practically does not hinder the connector installation. Even when the dielectric layer 4 on the distal end side of the bar 5 is cut and removed to expose the center conductor, the dielectric layer 4 is usually cut off while leaving the dielectric layer 4 of about 2 mm.
Since it is removed, no insulation failure occurs with the center conductor 8 even when used under a high voltage.

The length from the jacket removing portion 7 to the cut end of the shield layer 3 is not particularly limited as long as the cut end of the shield layer 3 does not protrude outside the metal ground bar 5 (for example,
Even when the length of the shield layer 3 is long, when the metal ground bar 5 is mounted on the dielectric layer 4 at the position where the metal ground bar 5 is mounted, the cut end of the shield layer 3 is outside the metal ground bar 5. It should not protrude),
After the cut shield layer 3 and the dielectric layer 4 are aligned in parallel with the exposed linear body, the shield layer 3 is covered with a metal ground bar 5 to cover the dielectric layer 4 with a predetermined pitch. When, for example, the exposure of the shield portion on the rear end side of the ground bar (the opposite side to the dielectric exposed portion) is further reduced, the length from the jacket removing portion 7 to the cut end of the shield layer 3 is: It must be shorter than the width of the metal ground bar 5. Normally, the length from the jacket removal portion 7 to the cut end of the shield layer 3 is preferably 10 to 100% of the width of the metal ground bar 5, and more preferably 20 to 80%. Note that a slight gap may be provided between the jacket removing portion 7 and the metal ground bar 5 for the purpose of facilitating connection with a connector. The length of the shield layer 3 sandwiched between the layers may be within the above range.

The metal ground bar 5 is a metal foil having a thickness of 0.05 to 1.0 mm made of a metal such as solder-plated copper.
m are commonly used. Here, the coaxial cable 1
As shown in FIG. 3, the center conductor 8 is covered with a dielectric layer 4, the shield layer 3 is provided thereon, and the outside is covered with a jacket 9. Usually, the diameter of the center conductor 8 is 0.
A single wire or seven twisted wires made of a copper alloy containing tin having a thickness of 09 to 0.15 mm are used, but the present invention is not limited to this.

As the dielectric layer 4, any synthetic resin having an insulating property can be used.
Fluororesin is used, but from the viewpoint of signal transmission characteristics and heat resistance when soldering is performed, tetrafluoroethylene-perfluoroalkylvinyl ether copolymer (P
Fluororesins such as FA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP) and polytetrafluoroethylene (PTFE) are preferably used. Further, as the shield layer 3, a horizontal winding or braid of a tin-containing copper alloy wire or a soft copper wire or the like is usually used, and recently, a synthetic resin film on which copper, aluminum, or the like is deposited is further deposited thereon. The surface contacts the horizontal winding, braid,
A film wound so that the film surface (non-deposited surface) is fused to the jacket 9 side is also used. Furthermore, examples of the jacket 9 include those commonly used as the jacket of a coaxial cable, such as a polyester film and a fluororesin.

In the above-mentioned example, the flat cable F in which a plurality of coaxial cables 1 are aligned and fixed with an adhesive tape 2 is used. Instead of being fixed, it may be a coaxial cable bundle, and may be aligned at the metal ground bar 5 and fixed at a predetermined pitch. Further, at the cut end of the coaxial cable 1, as shown in FIG. 4, the dielectric layer 4 may be removed, and the exposed central conductor 8 may be overcoated with solder, as shown in FIG. Alternatively, the end of the center conductor 8 may be fixed and protected at a predetermined pitch by the fixing member 10. As the fixing member 10, an adhesive tape is usually used, but any material can be used as long as the end of the center conductor 8 can be fixed and protected at a predetermined pitch. Further, a plurality of coaxial cables 1 having the same outer diameter and different diameters of the center conductor 8 may be combined and aligned, or the coaxial cables 1 having the same diameter of the center conductor 8 and different outer diameters may be used. May be used in parallel. Also, a plurality of coaxial cables 1 having different diameters of the center conductor 8 and different outer diameters may be combined and aligned for use. Further, the plurality of coaxial cables 1 may be colored in different colors for identification.

As a method of manufacturing a terminal-processed coaxial cable of the present invention, at least one end of a coaxial cable body obtained by aligning a plurality of coaxial cables 1 is cut, and a jacket 9 is removed near the cut end. To expose the shield layer 3. As shown in FIGS. 1 and 2, in the case of a flat cable F in which a plurality of coaxial cables 1 are aligned and fixed with an adhesive tape 2, the adhesive tape 2 is removed simultaneously with the removal of the jacket 9. At this time, it is convenient to remove the jacket 9 or the jacket 9 and the adhesive tape 2 by irradiating a laser beam to make a cut. When a metal-deposited film is provided on a horizontal winding or braid of a tin-containing copper alloy wire or annealed copper wire as the shield layer 3, the metal-deposited film is regarded as the jacket 9, and Together with it. When the plurality of coaxial cables 1 are used as a coaxial cable bundle without being fixed with the adhesive tape 2, the plurality of coaxial cables 1 are bonded at a predetermined pitch in a portion where the jacket 9 is removed. If you fix by
Subsequent work is easy.

Next, the shield layer 3 is loosened and the exposed shield layer 3 is separated from the dielectric layer 4. The shield layer 3 and the dielectric layer 4 are easily separated from each other due to the difference in elasticity. After that, the shield layer 3 is cut into a predetermined length to expose the dielectric layer 4. In particular, the shield layer 3 and the linear body from which the dielectric layer 4 is exposed are linearly aligned, and the shield layer 3 is fixed to a predetermined length with only the shield layer 3 fixed to a fixing member such as an adhesive tape. By cutting the shield layer 3 so as to expose the dielectric layer 4, the shield layer 3 can be easily cut. Here, as the fixing member,
In addition to the adhesive tape, a member that is fixed at a predetermined pitch with a linear body sandwiched between two grooved plates, a rubber sheet, or the like can be used.

In this case, the outer layer 7 is removed from the shield layer 3.
As described above, unless the cut end of the shield layer 3 projects outside the metal ground bar 5 as described above.
Although there is no particular limitation, the cut shield layer 3 and dielectric layer 4
After aligning the exposed linear body, the shield layer 3 is covered with a metal ground bar 5 and covered, and is fixed with the solder 6 over the shield layer 3 and the dielectric layer 4 at a predetermined pitch. In order to further reduce the exposure of the shield portion on the rear end side of the ground bar (the side opposite to the dielectric exposed portion) in consideration of the shield characteristics and signal transmission characteristics, etc., cut the shield layer 3 from the jacket removal portion 7. The length to the end needs to be shorter than the width of the metal ground bar 5. Usually, the length from the jacket removal portion 7 to the cut end of the shield layer 3 is preferably 10 to 100% of the width of the metal ground bar 5,
Further, the content is preferably set to 20 to 80%. When a gap is provided between the jacket removal portion 7 and the metal ground bar 5, the length of the shield layer 3 sandwiched between the metal ground bars 5 may be set within the above range.

Next, the linear body with the dielectric layer 4 exposed is fixed at a predetermined pitch by a fixing member.
Is covered with a pair of metal ground bars 5 in a state where the cut ends thereof do not substantially protrude from the metal ground bar 5, and is fixed over the shield layer 3 and the dielectric layer 4 at a predetermined pitch with solder 6. . Here, as the fixing member, in addition to the adhesive tape, a grooved alignment jig attached to the metal ground bar mounting device for aligning and fixing the linear body at a predetermined pitch, two grooved plates, A member fixed at a predetermined pitch with a linear body sandwiched between rubber sheets or the like can be used.

Thereafter, if necessary, the dielectric layer 4 on the tip side of the metal ground bar 5 is irradiated with a laser beam,
The dielectric layer 4 is cut and removed, and the exposed central conductor 8 is overcoated with solder. At this time, the dielectric layer 4 on the tip side of the metal ground bar 5 is fixed with a fixing member such as an adhesive tape, and a laser beam is irradiated between the metal ground bar 5 and the fixing member or on the fixing member. When the plurality of dielectric layers 4 are removed at a time by cutting the dielectric layer 4 and pulling out the fixing member, the work of removing the dielectric layer 6 can be performed efficiently. When the dielectric layer 4 on the tip side of the metal ground bar 5 is cut and removed to expose the center conductor 8, it is usually about 2 mm to maintain the insulation between the metal ground bar 5 and the center conductor 8. The dielectric layer 4 is cut off and removed.

Here, as the fixing member, similarly to the fixing member used at the time of cutting the shield layer, the linear body is sandwiched between two grooved plates or rubber sheets in addition to the adhesive tape. A member fixed at a predetermined pitch can be used. Next, the center conductor end 8 overcoated with solder is fixed at a predetermined pitch by a fixing member 10 as necessary to protect it. As described above, an adhesive tape is usually used as the fixing member 10, but any material can be used as long as the end of the center conductor 8 can be fixed and protected at a predetermined pitch. Needless to say, the terminal processing may be performed not only at one end but also at both ends.

[0020]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the present invention. Example 1 A 0.06 mm-thick fluororesin (PF) was applied to a center conductor obtained by twisting seven tin-containing copper alloy wires having a diameter of 0.03 mm.
A), a tin-containing copper alloy wire having a wire diameter of 0.03 mm is horizontally wound thereon to form a shield layer, and a copper vapor-deposited polyester film is wound thereon, and further as a jacket thereon A colored polyester film was wound around to prepare a coaxial cable having an outer diameter of 0.33 mm. Twenty coaxial cables were arranged in parallel at a pitch of 0.5 mm, and an adhesive tape was attached from above and below to prepare a flat cable.

Next, one end of the flat cable is cut, a carbon dioxide laser beam is applied to a position 15 mm from the cut end to make a cut, and the adhesive tape, the copper-deposited film and the jacket film are pulled out and removed. The wound shield layer was exposed. Thereafter, the shield layer was loosened to separate the exposed shield layer from the dielectric layer. After that, the shield layer separated from the dielectric layer and the linear body with the exposed dielectric layer are linearly aligned, the shield layer is stuck to the adhesive tape, and the length from the jacket removal part to the cut end of the shield layer is removed. And the shield layer was removed together with the adhesive tape. Next, the linear body with the exposed dielectric layer is fixed at a predetermined pitch with an adhesive tape, and the exposed shield layer is soldered with a width of 0.1 mm together with solder so that the cut end thereof is not substantially exposed from the metal ground bar. It was sandwiched and covered by a set of 6 mm metal ground bars, heated at 240 ° C., and fixed over the shield layer and the dielectric layer at a predetermined pitch by soldering.

Thereafter, the dielectric layer on the tip side of the metal ground bar is fixed at a predetermined pitch with an adhesive tape, and a carbon dioxide laser beam is applied between the metal ground bar and the adhesive tape so that the dielectric layer is removed. By cutting and pulling out the adhesive tape, a plurality of dielectric layers were removed at a time, and the exposed central conductor was overcoated with solder. Next, in order to protect the center conductor end portion overcoated with solder, the center conductor end portion was fixed at a predetermined pitch with an adhesive tape. In the end-processed coaxial cable thus obtained, the cut end of the shield layer does not protrude out of the metal ground bar at all, no protruding solder is observed, the end surface of the ground bar is extremely clean, and the shield layer and the center conductor are removed. No insulation failure occurred, and the incidence of connection failure to the connector was 0%. Further, only one set of ground bar was used, and the cost could be reduced.

Comparative Example Using the flat cable prepared in Example 1,
According to the embodiment of JP-A No. 0-144145, the shield layer is exposed near the end of the cable, two sets of metal ground bars are fixed to the shield layer by solder, and a middle point between the two sets of ground bars is used as a fulcrum. Then, the shield layer is cut by bending the cable, and the shield layer is removed together with the ground bar on the end side to expose the dielectric layer.A plastic tape is fused to the dielectric layer, and each insulating core is cut. After fixing the pitch, the dielectric layer is cut with laser light, shifted in the direction to peel off the dielectric layer at the end to expose the center conductor, and cut off the end side from the plastic tape,
The end of the center conductor was subjected to solder coating. In the obtained terminal-processed coaxial cable, as shown in FIG. 5, the cut end of the shield layer 3 including the solder 6 projects outside the metal ground bar 5 over a length of 0 to 1.0 mm. 3 and the center conductor 8 cause insulation failure,
The incidence of poor connection to the connector reached 26%. In addition, the use of two sets of metal ground bars resulted in an increase in cost.

Example 2 A 0.09 mm thick fluororesin (FE) was applied to a center conductor obtained by twisting seven copper alloy wires containing tin having a diameter of 0.04 mm.
P), and a braid made of a soft copper wire having an element wire diameter of 0.03 mm is coated thereon to form a shield layer, and a colored polyester film is wound as an outer coat to form an outer diameter of 0.5
A 1 mm coaxial cable was made. This coaxial cable 2
Zero coaxial cables were used as a coaxial cable bundle without using a flat cable. At the portion where the jacket was removed, 20 coaxial cables were fixed at a predetermined pitch with an adhesive tape, and the ends were cut off. A cut was made by irradiating a carbon dioxide laser beam from above the adhesive tape at a position 15 mm from the cut end, and the adhesive tape and the jacket were pulled out and removed, exposing the braided shield layer. Thereafter, the shield layer was loosened to separate the exposed shield layer from the dielectric layer. Thereafter, the shield layer separated from the dielectric layer and the linear body with the dielectric layer exposed are linearly aligned and the shield layer is
It is sandwiched and fixed by a fixing member composed of two rubber sheets, and the length from the jacket removal portion to the cut end of the shield layer is 0.7 mm.
Then, the cut shield layer fixed by the rubber sheet fixing member was removed.

Next, the linear body with the dielectric layer exposed is fixed at a predetermined pitch by a grooved aligning jig attached to a metal ground bar mounting device, and the exposed shield layer is cut at the metal ground bar. So that it is not substantially exposed from
Along with the solder, it was sandwiched and covered by a pair of metal ground bars having a width of 1.14 mm, heated at 240 ° C., and fixed over the shield layer and the dielectric layer at a predetermined pitch by soldering. Thereafter, the dielectric layer on the tip side of the metal ground bar is fixed at a predetermined pitch with an adhesive tape, and the dielectric layer is cut by irradiating a carbon dioxide laser beam between the metal ground bar and the adhesive tape, By pulling out the adhesive tape, a plurality of dielectric layers were removed at once, and the exposed central conductor was overcoated with solder. Next, in order to protect the center conductor end portion overcoated with solder, the center conductor end portion was fixed at a predetermined pitch with an adhesive tape. In the end-processed coaxial cable thus obtained, the cut end of the shield layer does not protrude out of the metal ground bar at all, no protruding solder is observed, the end surface of the ground bar is extremely clean, and the shield layer and the center conductor are removed. Insulation failure with the connector does not occur, and the incidence of connection failure to the connector is 0%
Met. Further, only one set of ground bar was used, and the cost could be reduced.

[0026]

According to the present invention, the shield layer does not protrude from the metal ground bar, so that the solder does not protrude and the end surface of the metal ground bar is extremely clean.
Attach a set of metal ground bars, shield layer,
Since the solder for fixing to the dielectric has good wettability with the shield layer, if the shield layer protrudes from the metal ground bar, the solder will pass through the shield layer and protrude from the metal ground bar, but the shield layer will not If the solder does not protrude from the metal ground bar, the solder does not protrude from the metal ground bar because of poor wettability with a synthetic resin, particularly a fluororesin, which is a dielectric layer. In the present invention, since the shield layer does not substantially protrude from the metal ground bar, the solder does not protrude from the metal ground bar, and the end surface of the metal ground bar is extremely clean. As a result, when connecting to the connector becomes difficult, or when used at high voltage, the current leakage between the shield layer and the center conductor causes insulation failure, resulting in a significantly lower failure rate. Can be done. Moreover, since only one set of ground bars is used,
The cost can be reduced as compared with the prior art using two sets of metal ground bars.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an example of a terminal-processed coaxial cable of the present invention.

FIG. 2 is a plan view of FIG. 1.

FIG. 3 is a cross-sectional view illustrating an example of a coaxial cable used in the present invention.

FIG. 4 is a plan view showing an example of a terminal-processed coaxial cable of the present invention.

FIG. 5 is a plan view showing an example of a conventional terminal-processed coaxial cable.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coaxial cable 2 Adhesive tape 3 Shield layer 4 Dielectric layer 5 Metal ground bar 6 Solder 7 Jacket removal part 8 Center conductor 9 Jacket 10 Fixing member F Flat cable E Flat cable cut end S Metal ground bar end face

Claims (16)

[Claims] At least one end of a coaxial cable body formed by aligning a plurality of coaxial cables is cut, and a jacket is removed near the cut end to expose a shield layer. Is cut to a predetermined length to expose the dielectric layer, the exposed shield layer is sandwiched between metal ground bars and covered, and is fixed by soldering over the shield layer and the dielectric layer at a predetermined pitch. A terminal-processed coaxial cable, wherein the cut end of the shield layer substantially exists inside the metal ground bar and does not protrude outside the metal ground bar. 2. The terminal-processed coaxial cable according to claim 1, wherein the length from the jacket removal portion to the cut end of the shield layer is shorter than the width of the metal ground bar. 3. The terminal-processed coaxial cable according to claim 1, wherein the dielectric layer is made of a fluororesin. 4. The method according to claim 1, wherein the dielectric layer is removed near the cut end of the coaxial cable, and the exposed central conductor is overcoated with solder.
4. The terminal-processed coaxial cable according to 2 or 3. 5. The terminal-processed coaxial cable according to claim 4, wherein the center conductor end is fixed and protected at a predetermined pitch by a fixing member. 6. The terminal-processed coaxial cable according to claim 5, wherein the fixing member is an adhesive tape. 7. The method according to claim 1, wherein the plurality of coaxial cables are colored in different colors for identification.
7. The terminal-processed coaxial cable according to any one of 6. 8. At least one end of a coaxial cable body formed by aligning a plurality of coaxial cables, removing a jacket in the vicinity of the cut end to expose a shield layer, and extending the shield layer to a predetermined length. To expose the dielectric layer, cover the exposed shield layer with a metal ground bar sandwiching the exposed end of the shield layer without substantially protruding from the metal ground bar. A method of manufacturing a terminal-processed coaxial cable, wherein the terminal-processed coaxial cable is fixed by soldering. 9. The method for manufacturing a terminal-processed coaxial cable according to claim 8, wherein a length from the jacket-removed portion to a cut end of the shield layer is shorter than a width of the metal ground bar. 10. The method according to claim 8, wherein the shield layer is separated from the dielectric layer, the shield layer is fixed to the fixing member, and the shield layer is separated from the dielectric layer and cut to a predetermined length.
Or a method for manufacturing a terminal-processed coaxial cable according to 9. 11. After the shield layer is cut to a predetermined length to expose a dielectric layer, the shield layer and the dielectric layer are aligned, and the dielectric layer is fixed at a predetermined pitch by a fixing member. Then, the shield layer is sandwiched and covered by the metal ground bar in a state where the cut end thereof does not substantially protrude from the metal ground bar, and is fixed at a predetermined pitch over the shield layer and the dielectric layer. The method for producing a terminal-processed coaxial cable according to any one of claims 8 to 10, characterized in that: 12. A laser beam is applied to a dielectric layer on the tip side of the metal ground bar to cut the dielectric layer.
The method for manufacturing a terminal-processed coaxial cable according to any one of claims 8 to 11, wherein the removed and exposed central conductor is overcoated with solder. 13. A dielectric layer closer to the tip end than the metal ground bar is fixed with a fixing member, and a laser beam is irradiated between the metal ground bar and the fixing member or on the fixing member to irradiate the dielectric layer. 13. The method for manufacturing a terminal-processed coaxial cable according to claim 12, wherein the plurality of dielectric layers are removed at a time by cutting off the fixing member. 14. The method according to claim 8, wherein the dielectric layer is made of a fluororesin. 15. An end portion of a center conductor is fixed and protected at a predetermined pitch by a fixing member.
5. The method for producing a terminal-processed coaxial cable according to any one of 4. 16. The fixing member according to claim 1, wherein the fixing member is an adhesive tape.
The method for producing a terminal-processed coaxial cable according to 0, 11, 13 or 15.