JP4240105B2 - Multi-core coaxial cable and manufacturing method thereof - Google Patents

Description

  The present invention relates to a multi-core coaxial cable and a manufacturing method thereof, for example, a multi-core coaxial cable capable of directly connecting a plurality of coaxial cables to a wiring provided on a substrate without using a connector, and a manufacturing method thereof. It is.

Conventionally, an electrical connector for connecting a plurality of coaxial cables to a wiring on a substrate is known (see, for example, Patent Document 1).
As shown in FIG. 7, this electrical connector 100 is fitted into a receptacle (not shown) to electrically connect the coaxial cable 101, and is an insulator housing 102 formed of a synthetic resin such as plastic. And a plurality of conductive terminals 103 disposed at a predetermined pitch along the width direction of the housing 102, and a shield plate 104 covering the upper surface of the housing 102. Each conductive terminal 103 is positioned and disposed in a housing recess 105 formed so as to be adjacent to each other at a predetermined pitch along the width direction of the housing 102. A coaxial cable 101 connected to the conductive terminal 103 includes a central conductor 107 connected to the conductive terminal 103 with solder, an insulator 108 surrounding the central conductor 107, and an external conductor 109 surrounding the insulator 108. And an outer jacket 110 surrounding the outer conductor 109. Each coaxial cable 101 is connected to each conductive terminal 103 to which each central conductor 107 corresponds, and each outer conductor 109 is collectively connected by a caulking member 111.
JP-A-2005-302604

By the way, as for the multi-core coaxial cable used for a mobile telephone etc., cables or a cable, a board | substrate, etc. are connected via the electrical connector. In the electrical connector 100 described in Patent Document 1 described above, the coaxial cable 101 is caulked and connected by a caulking member 111 which is a common connecting metal plate without soldering the outer conductor 109 to each of the coaxial cables 101. Accordingly, the bendability of the coaxial cable 101 is not impaired by the solder impregnation of the outer conductor 109, and the workability at a narrow connection portion of the cable is improved.
However, with the miniaturization of equipment, the connection locations are becoming narrower, and cables having a small diameter such as AWG (American Wire Gauge) 40 to 46 are used. Under such circumstances, connection via an electrical connector as described in Patent Document 1 described above is becoming difficult. Therefore, it is awaited to realize a connectorless connection such as connecting a central conductor of each cable directly to a circuit of a device without using a connector in order to minimize the connection location.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a multi-core coaxial cable suitable for use in a narrow connection place and a method for manufacturing the same, while stabilizing the connection of the center conductor. It is to provide.

  In order to achieve the above-mentioned object, the first feature of the multi-core coaxial cable according to the present invention is that the outer cover is removed and the outer conductor, the insulator, and the central conductor are sequentially exposed stepwise. Are arranged in parallel, and ground bars having locking claws for individually locking the coaxial cables are fixed to the outer conductors to fix the distance between the coaxial cables, and the exposed central conductors are It is made flat along the parallel surface, and both flat surfaces of each of the central conductors are covered with an insulating coating material, and at least one of the flat coating side insulating coating materials has a window, and the window The center conductor is partially exposed.

  In the multi-core coaxial cable configured as described above, the coaxial cable is individually locked to the locking claws of the ground bar, and the ground bar is fixed to the outer conductor of the coaxial cable, whereby the distance between the coaxial cables is predetermined. Can be fixed to the pitch. Further, since the position of the central conductor is regulated to a predetermined pitch by the insulating coating material, the central conductor can be held at the predetermined pitch even during use or transportation. At this time, since the center conductor is rolled into a flat surface, when the center conductor is positioned by the insulation coating material, the insulation coating material and the center conductor are in surface contact, and the insulation coating material is applied to one surface of the center conductor. It can be securely bonded. Furthermore, since the central conductor partially exposed from the window of the insulating coating material is also a flat surface, when the mating terminal is brought into contact therewith, surface contact is obtained, and connection stabilization can be achieved. In addition, since the center conductor can be directly connected to a substrate or the like without connecting a connection terminal to the center conductor as in the prior art, the connector is omitted and the structure of the connection portion is simplified and the connector is reduced in size. Realize less connection. Thereby, it can connect reliably also in a narrow connection location.

  Further, the second feature point of the multi-core coaxial cable according to the present invention is the first feature point of the present invention, wherein the end of the center conductor is aligned so as not to protrude from the insulating coating material. That is.

  In the multi-core coaxial cable configured as described above, the central conductor protruding from the insulation coating does not become an obstacle, and the center conductor exposed from the window is connected to the circuit, and the insulation coating material portion is as if it is a connector. Can be used for

  Further, the third feature of the multi-core coaxial cable according to the present invention is that, in the first or second feature of the present invention, only the insulating covering material on one flat plane side has a window, and the other That is, a reinforcing material is interposed between the insulating coating material on the surface side and the central conductor.

  In the multi-core coaxial cable configured as described above, since the reinforcing material is interposed between the central conductor and the insulating coating material covering one surface of the central conductor, the rigidity of the insulating coating material portion is increased. Thereby, it becomes easy to push the insulating coating material part into a receptacle such as a substrate as it is to establish electrical connection with the circuit.

  The fourth feature of the method for manufacturing a multi-core coaxial cable according to the present invention is that the outer conductor, the insulator, and the central conductor are sequentially stepped in a predetermined length by removing the outer sheath of the plurality of coaxial cables. Expose, at least the outer conductor is locked to the locking claw portion of the ground bar and positioned at a predetermined pitch, and each center conductor is rolled to be flat along the parallel surface, and one of the center conductors is rolled. The flat surface is covered with an insulating coating material, and the other flat surface is covered with an insulating coating material having a window from which a part of each central conductor is exposed.

  In the manufacturing method of the multi-core coaxial cable configured as described above, the coaxial cable of the present invention can be manufactured.

  Further, a fifth feature of the method for manufacturing a multi-core cable according to the present invention is the fourth feature of the present invention, in which both the flat surfaces of the center conductor are covered with an insulating covering material, and then the center. The tip of the central conductor is trimmed so that the tip of the conductor does not protrude from the insulating coating material.

  In the manufacturing method of the multi-core coaxial cable configured as described above, the end portion of the center conductor is trimmed so as not to protrude from the insulating coating material, and the insulating coating material portion can be used as if it is a connector.

  Further, a sixth feature of the method for manufacturing a multi-core cable according to the present invention is the fourth or fifth feature of the present invention, wherein one flat surface of the central conductor is provided with an insulating covering material without a window. And the other flat surface is covered with an insulating covering material having a window, and when the central conductor is covered with the insulating covering material without the window, a reinforcing material is interposed between them.

  In the manufacturing method of the multi-core coaxial cable configured as described above, the center conductor and the circuit can be electrically connected through the window and the rigidity of the insulating covering material portion is ensured. It becomes easy to insert and remove the covering material.

  According to the present invention, a ground bar having a locking claw that can individually lock the coaxial cable is fixed to the outer conductor of the coaxial cable, and the interval between the plurality of coaxial cables is fixed to a predetermined pitch. Therefore, the structure of the connection portion of the electrical connector in which the connection terminal is connected to the conventional central conductor can be simplified. Further, since the position of the central conductor is regulated to a predetermined pitch by the insulating coating material, the central conductor can be held at the predetermined pitch even during use or transportation. At this time, since the center conductor is rolled and flattened, the center conductor is brought into surface contact when the center conductor is positioned by the covering material, and the center conductor can be reliably bonded. Furthermore, since the other surface of the central conductor covered in a state of being partially exposed by the covering material is also flattened, when connecting the mating terminal to this, it becomes surface contact and stabilizes the connection. Can do. In addition, since it is possible to connect directly to a substrate or the like without connecting a connection terminal to the central conductor as in the prior art, the structure of the connection portion is simplified and the size is reduced, and the connection is securely performed even in a narrow connection place. The effect that it can be obtained.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing a first embodiment of a multi-core coaxial cable according to the present invention, FIG. 2A is a plan view of the multi-core coaxial cable, and FIG. 2B is BB in FIG. FIGS. 3A to 3C are process diagrams showing a method for manufacturing a multi-core cable according to the present invention, and are a plan view and a cross-sectional view.

As shown in FIGS. 1 and 2, in the multi-core coaxial cable 10 according to the first embodiment of the present invention, the center conductor 12, the insulator 13, and the outside are arranged at the end portions of the plurality of coaxial cables 11 arranged in parallel. The conductors 14 are sequentially exposed from the coating 15 stepwise. A ground bar 16 is provided that engages with the end portion, positions the coaxial cable 11 at a predetermined pitch, and is fixed to each external conductor 14.
At least the exposed central conductor 12 is rolled and flattened. The flat surface is arranged along the parallel surface of the coaxial cable, that is, both are substantially parallel. One flat surface of the flattened center conductor 12 is provided with a first covering material 20 as an insulating covering material that positions the center conductor 12 at a predetermined pitch, and the other surface of the center conductor 12 is at least centered. A second covering material 21 is provided as an insulating covering material that partially exposes the conductor 12.

  As the coaxial cable 11, for example, an ultra-fine diameter (AWG (American Wire Gauge) 40-46) is used. As shown in FIG. 2, the coaxial cable 11 has a central conductor 12 at the center. The center conductor 12 is generally a twisted wire made of a copper wire because it is flexible and resistant to bending, but here a single wire that is difficult to deform is used. The center conductor 12 is rolled and flattened. At this time, it is desirable that the tip of the insulator 13 (end on the side of the central conductor 12) is also slightly flattened. As shown in FIG. 6, the ground bar 16 is formed with a number of locking claws 23 serving as locking means for fixing the coaxial cables 11 arranged side by side at a predetermined pitch. Specifically, the ground bar 16 is formed in a U-shaped cross section from the flat surface portion 18 and the vertical wall portion 19 by bending both end portions of a belt-shaped member made of a metal conductor at a substantially right angle. A number of locking claws 23 arranged at a predetermined pitch are formed on the vertical wall portion 19. The coaxial cable 11 is disposed in the groove between the adjacent locking claws 23. The width of the locking claw 23 is the arrangement pitch of the coaxial cables 11. The width of the groove is set equal to the outer diameter of the coaxial cable 11. The coaxial cable 11 is sandwiched between locking claws 23 having a predetermined width and arranged at a predetermined pitch. A pressing member 17 is provided opposite to the ground bar 16. The holding member 17 cooperates with the ground bar 16 to sandwich the coaxial cable 11 and hold the outer conductor 14 with certainty. The holding member 17 has the same structure as the ground bar 16, that is, the outer conductor 14 can be sandwiched between the two ground bars.

  As the 1st coating | covering material 20 which fixes the center conductor 12 from the lower side, and the 2nd coating | covering material 21 which fixes from the upper side, what apply | coated the epoxy resin to the surface of thermosetting resins, such as a polyimide, as an adhesive material is used. it can. Therefore, the first covering material 20 adheres the central conductor 12 from the lower side. However, since the central conductor 12 is flattened, the central conductor 12 can be securely adhered and held at a predetermined pitch. Further, when the second covering material 21 is overlapped with the center conductor 12 sandwiched from above and below, the epoxy-based resins applied to the surfaces of the first covering material 20 and the second covering material 21 are joined together. It will be held securely. In addition, since the window 21a is notched and provided in the center part of the 2nd coating | covering material 21, as shown to FIG. 2 (A), a part of all the center conductors 12 are exposed to the window 21a. Yes.

  Further, a reinforcing material 22 is interposed between the central conductor 12 and the first covering material 20 (insulating covering material without a window) disposed on one flat surface of the central conductor 12 (lower side in FIG. 2A). It is desirable to insert. The reinforcing member 22 reinforces the flat portion 12b of the central conductor 12 from below, and is formed of a heat resistant resin (heat resistant polyester or the like). The reinforcing member 22 has a length of substantially the entire width in the width direction of the multi-core coaxial cable 10 (left and right direction in FIG. 2A), and the central conductor 12 exposed from the window 21a of the second covering member 21. It is wide enough to cover the majority. Thereby, when the mating terminal is pressed against the flat portion 12b of the central conductor 12 that can increase the rigidity of the portion sandwiched between the insulating coating materials, the reinforcing member 22 resists against the pressing force, The central conductor 12 and the terminal can be electrically connected reliably. Even in the connection method in which the insulating coating material portion is inserted into and removed from the receptacle, the insulating coating material portion can be inserted and removed without bending or breakage, and the insulating coating material portion can be used like a connector.

  As described above, according to the multi-core coaxial cable 10 described above, the ground bar 16 having the locking claws 23 capable of individually locking the coaxial cable 11 is fixed to the outer conductor 14 of the coaxial cable 11, so that a plurality of Since the distance between the coaxial cables 11 is fixed at a predetermined pitch, the configuration of the connection portion of the electrical connector in which the connection terminal is connected to the conventional center conductor can be simplified. Further, since the position of the central conductor 12 is regulated to a predetermined pitch by the first covering material 20, the central conductor 12 can be held at the predetermined pitch even during use or transportation. At this time, since the center conductor 12 is rolled and flattened, when the center conductor 12 is positioned by the first covering material 20, surface contact occurs, and the center conductor can be reliably bonded. Further, the other surface of the central conductor 12 covered in a state of being partially exposed by the second covering material 21 is also flattened, so that when the mating terminal is connected to this, surface contact occurs, and electrical Connection stabilization can be achieved. In addition, since it is possible to connect directly to a substrate or the like without connecting a connection terminal to the central conductor 12 as in the prior art, the structure of the connection portion is simplified and the size is reduced, and the connection is ensured even in a narrow connection place. can do.

Next, the manufacturing method of the multi-core coaxial cable according to the present invention will be described.
3A to 3C are a plan view and a cross-sectional view showing the manufacturing process. In addition, the same code | symbol is attached | subjected to the site | part which is common in the multi-core coaxial cable 10 mentioned above, and redundant description is abbreviate | omitted.
First, as shown in FIG. 3 (A), a plurality of coaxial cables (two in the drawing) 11 are arranged in parallel, their coatings 15 are burned out with a laser, and slits are formed to remove them all at once. The outer conductor 14 and the insulator 13 are also burned out with a laser and slits are removed to remove the outer conductor 14, the insulator 13 and the central conductor 12 in a stepwise manner in order to expose the outer conductor 14, the insulator 13 and the center conductor 12. In the positioning step, the outer conductor 14 is sandwiched in a groove between the locking claws 23 of the ground bar 16 (see FIG. 6) and positioned at a predetermined pitch, and at the same time, the pressing member 17 is covered from above and the coaxial cable 11 The center bar 12 and the pressing member 17 are fixed to the coaxial cable 11 with solder, a conductive adhesive or the like in a state where the center conductor 12 is projected forward from the ground bar 16 and the pressing member 17. Then, as shown in FIG. 3 (B), in the rolling process, the rolling is performed in a rolling range R that includes the tip portion 12a of the center conductor 12 and includes a little tip portion of the insulator 13, and is exposed. The center conductor 12 is flattened. Further, as shown in FIG. 3C, in the covering step, a reinforcing material 22 is put under the flat portion 12b of the central conductor 12, and the flattened central conductor 12 and the rolled portion of the insulator 13 are placed. The first covering member 20 is bonded from below, and the center conductor 12 is fixed at a predetermined pitch. Then, the second covering material 21 is bonded from above the central conductor 12 so as to overlap the first covering material 20. At this time, the upper surface of the flat portion 12 b of the center conductor 12 is exposed from the window 21 a of the second covering material 21. Finally, the first covering material 20, the central conductor 12, and the second covering material 21 are cut along the cut line L (see FIG. 3C) near the tip of the flat portion 12 of the central conductor 12, A multi-core coaxial cable 10 as shown in FIG.

  As described above, according to the manufacturing method of the multi-core coaxial cable described above, the ground bar 16 having the locking claw portions 23 that can individually lock the coaxial cable 11 is fixed to the outer conductor 14 of the coaxial cable 11, so Since the interval between the coaxial cables 11 is fixed to a predetermined pitch, the configuration of the connection portion of the electrical connector in which the connection terminal is connected to the conventional central conductor can be simplified. In addition, since the flat portion 12b is provided by rolling the center conductor 12, surface contact is made when the center conductor 12 is positioned by the first coating material 20, and the center conductor 12 can be reliably bonded. Furthermore, since the second covering material 21 is overlapped with the first covering material 20 and the center conductor 12 is sandwiched, the movement of the center conductor 12 can be more reliably prevented. Moreover, since the other surface of the center conductor 12 covered in the state exposed partially by the 2nd coating | covering material 21 is also flat, when connecting the other party terminal here, it becomes a surface contact and connection stability In addition, since the flat portion 12b of the center conductor 12 is supported by the reinforcing member 22 from below to ensure rigidity, the insulating coating portion can be used as if it were a connector.

Next, a second embodiment of the multi-core coaxial cable according to the present invention will be described.
FIG. 4 is a perspective view showing a second embodiment of the multi-core coaxial cable of the present invention. In addition, the same code | symbol is attached | subjected to the site | part which is common in the site | part demonstrated in 1st Embodiment, and suppose that the overlapping description is abbreviate | omitted.
As shown in FIG. 4, in this multi-core coaxial cable 10 </ b> B, the cut line L (see FIG. 3C) near the tip is set to a position that passes through the window 21 a of the second covering material 21. The tip is cut. Accordingly, the upper surface of the flat portion 12 b of the central conductor 12 is exposed upward from the window 21 a of the second covering material 21, and the tip surface of the flat portion 12 b is the tip between the first covering material 20 and the second covering material 21. Will be exposed to.
Even if it does in this way, while being able to acquire the effect similar to embodiment mentioned above, the connection of the other party terminal from the front to the center conductor 12 becomes easy further.
Note that the multi-core cable 10B can be manufactured by the same method as the multi-core coaxial cable manufacturing method described in the first embodiment.

Next, a third embodiment of the multi-core coaxial cable according to the present invention will be described.
FIG. 5 is a perspective view showing a third embodiment according to the multi-core coaxial cable of the present invention. In addition, the same code | symbol is attached | subjected to the site | part which is common in the site | part demonstrated in 1st Embodiment, and suppose that the overlapping description is abbreviate | omitted.
As shown in FIG. 5, in this multi-core coaxial cable 10C, the second covering material provided as a covering material in the multi-core coaxial cable 10 according to the first embodiment and the multi-core coaxial cable 10B according to the second embodiment. 21 is omitted. Therefore, the center conductor 12 is adhered and fixed only by the lower first covering material 20. Further, the upper surface of the flat portion 12b of the center conductor 12 is exposed upward.
Even if it does in this way, while being able to acquire the effect similar to embodiment mentioned above, the connection of the other party terminal from the front to the center conductor 12 becomes easy further.
In addition, in the manufacturing method of the multi-core coaxial cable described in the first embodiment, the multi-core cable 10C can be manufactured by the same method except for the step of providing the second covering material 21.

The multi-core cable and the manufacturing method thereof according to the present invention are not limited to the above-described embodiments, and appropriate modifications and improvements can be made.
For example, the first coating material 20 or the second coating material 21 described above is heated and cured using an epoxy resin that is a thermosetting resin, but is heated using polyethylene or polypropylene that is a thermoplastic resin. -It may be melted and welded.

  As described above, the multi-core coaxial cable and the method for manufacturing the same according to the present invention attach the ground bar that is fixed to the outer conductor of the coaxial cable to position the coaxial cable. It can be simplified. Further, since the position of the central conductor is regulated to a predetermined pitch by the covering material, the central conductor can be held at the predetermined pitch even during use or transportation. At this time, since the center conductor is rolled and flattened, the center conductor is brought into surface contact when the center conductor is positioned by the covering material, and the center conductor can be reliably bonded. Furthermore, since the other surface of the center conductor covered in a state of being partially exposed by the covering material is also flattened, the connection can be stabilized when the counterpart terminal is brought into contact therewith. In addition, since it is possible to connect directly to a substrate or the like without connecting a connection terminal to the central conductor as in the prior art, the structure of the connection portion is simplified and the size is reduced, and the connection is securely performed even in a narrow connection place. This is useful as a multi-core coaxial cable that can directly connect a plurality of coaxial cables to a wiring or the like provided on a substrate without using a connector, a manufacturing method thereof, and the like.

It is a perspective view showing a 1st embodiment concerning a multi-core coaxial cable of the present invention. (A) is a plan view of a multi-core coaxial cable (B) is a cross-sectional view taken along the line BB in FIG. 2 (A). (A)-(C) are process drawings which show the manufacturing method of the multi-core coaxial cable which concerns on this invention. It is a perspective view which shows 2nd Embodiment of the multi-core coaxial cable of this invention. It is a perspective view which shows 3rd Embodiment of the multi-core coaxial cable of this invention. It is a perspective view of a ground bar. It is sectional drawing which shows the conventional electrical connector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Multi-core coaxial cable 11 Coaxial cable 12 Center conductor 12a Tip part 12b Flat part 13 Insulator 14 External conductor 16 Ground bar 20 1st coating | covering material 21 2nd coating | covering material 22 Reinforcement material

Claims (6)

  A ground bar having a plurality of coaxial cables in which the outer sheath, the outer conductor, the insulator, and the central conductor are sequentially exposed in a step shape are juxtaposed, and a locking claw portion for locking the coaxial cables individually. Are fixed to the outer conductors to fix the distance between the coaxial cables, and the exposed central conductors are flattened along the parallel plane, and the flat surfaces of the central conductors are respectively made of an insulating coating. A multi-core coaxial cable that is covered and at least one of the flat insulation-side insulating covering material has a window, and the central conductor is partially exposed from the window.   The multi-core coaxial cable according to claim 1, wherein the center conductor is cut and aligned so as not to protrude from the insulating coating material.   Only the insulating coating material on one flat surface side has a window, and a reinforcing material is interposed between the insulating coating material on the other surface side and each of the central conductors. Item 3. The multi-core coaxial cable according to item 1 or 2.   The outer sheath of the plurality of coaxial cables is removed, and the outer conductor, the insulator, and the center conductor are sequentially exposed in a predetermined length stepwise, and at least the outer conductor is locked to the locking claw portion of the ground bar. Positioning at a pitch, rolling each of the central conductors so as to be flat along the parallel surface, covering one flat surface of the central conductor with an insulating coating material, and covering the other flat surface with one of the central conductors. A method of manufacturing a multi-core cable, comprising covering with an insulating coating material having a window through which a portion is exposed.   5. The tip of the center conductor is trimmed so that the tip of the center conductor does not protrude from the insulation coating material after covering both flat surfaces of the center conductor with an insulation coating material. A manufacturing method of a multi-core coaxial cable.   One flat surface of the central conductor is covered with an insulating coating material without a window, the other flat surface is covered with an insulating coating material having a window, and the central conductor is covered with an insulating coating material without a window. A method of manufacturing a multi-core cable according to claim 4 or 5, wherein a reinforcing material is inserted in the cable.

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