JP2008251486A - Coaxial flat cable and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flat coaxial cable, and its manufacturing method, capable of further improving grounding performance by reduction contact resistance. <P>SOLUTION: The coaxial flat cable 10 has a plurality of coaxial cables 11 each equipped with a center conductor 15, an inner insulator 14 fitted on an outer periphery of the conductor 15, an outer conductor 13 fitted on an outer periphery of the inner insulator 14 and an outer coating fitted on an outer periphery of the outer conductor 13 arranged in parallel. The outer conductor 13 is made by spirally winding a plurality of strands 13a in a horizontal direction, and the strands 13a are integrated with each other at an exposed part E exposed from the outer coating 12, and adhered to common grounding bars 20, 30 by an adhesive made of resin. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a coaxial flat cable and a method for manufacturing the same.

  In recent years, with the widespread use of mobile phones, small video cameras, and the like, in addition to the reduction in size and weight of these electronic devices, higher speed and higher image quality are required. To meet these requirements, extremely thin coaxial cables are used to connect the device main unit and the liquid crystal display, and wiring in the devices. Also, for ease of wiring, multiple coaxial cables are integrated together. Harness-shaped coaxial flat cable is used.

A coaxial cable used for a coaxial flat cable is configured by sequentially arranging a central conductor, an inner insulator, an outer conductor, and a jacket from the inside in a coaxial shape. The central conductor is formed, for example, by twisting seven copper alloy wires, and the outer periphery thereof is covered with an insulating material such as Teflon (registered trademark) resin to form an internal insulator.
The outer conductor disposed on the outer peripheral surface of the inner insulator is formed by braiding a wire made of, for example, a copper alloy or the like, and providing a jacket on the outer periphery thereof.

  By consolidating a plurality of such coaxial cables, a coaxial flat cable is formed. The terminal portion of the coaxial flat cable is connected and fixed to a connector terminal or a substrate having a predetermined pitch by soldering or the like. . As this type of coaxial flat cable, the one shown in FIG. 12 is known (for example, see Patent Document 1).

  In FIG. 12, 1 is a coaxial cable, 1a is its central conductor, 1b is its internal insulator, 1c is its external conductor, 1d is its jacket, 2 is a ground bar for grounding, 3 is a connector terminal or FPC The connected member which consists of board | substrates, such as, is shown.

  In FIG. 12, the common ground bar 2 is integrated with the conductive adhesive 12 on the upper and lower surfaces of the outer conductors 1 c of the plurality of coaxial cables 1 by the lead-out process.

  Then, the center conductor 1 a of each coaxial cable 1 subjected to terminal processing is soldered to a predetermined contact or the like of the connected member 3.

JP 2006-196418 A

  By the way, as described above, electronic devices such as mobile phones and small video cameras have been further improved in performance, and the amount of information to be processed has also increased. On the other hand, since there is a demand for reduction in size and weight, high density mounting is also required for coaxial flat cables used in such electronic devices, and the number of cores per coaxial flat cable, that is, the number of coaxial cables increases. There is a tendency. For example, two coaxial flat cables with 20 cores are used, and one coaxial flat cable with 40 cores is used.

Thus, when the number of coaxial flat cables is further increased, it is required to further improve the grounding performance of the outer conductor.
An object of the present invention is to provide a coaxial flat cable that can lower the contact resistance between an outer conductor and a ground bar to further improve the grounding performance, and a method for manufacturing the same.

  The coaxial flat cable according to the present invention capable of solving the above-described problems is a center conductor, an inner insulator disposed on the outer periphery thereof, an outer conductor disposed on the outer periphery of the inner insulator, and an outer periphery of the outer conductor. A plurality of coaxial cables having a jacket disposed on the outer conductor are arranged in parallel, and the outer conductor is formed by spirally winding a plurality of strands in an exposed portion exposed from the jacket. The wires are bonded to a common ground bar with an adhesive made of a resin in a state where they are integrated with each other and are electrically connected.

  The coaxial flat cable which concerns on this invention WHEREIN: It is preferable that the said strands which comprise the said external conductor are mutually welded in the cut location in the said exposed part, and are made into the state electrically integrated.

  Or the coaxial flat cable which concerns on this invention WHEREIN: It is preferable that the side part of the said strand which comprises the said external conductor is welded mutually by the said exposed part, is made into the state electrically integrated.

  In the coaxial flat cable according to the present invention, it is preferable that a plating made of a low-melting-point material applied to the element wire is welded, integrated, and electrically connected.

  Alternatively, in the coaxial flat cable according to the present invention, the side portions of the strands constituting the outer conductor are bonded to each other by a conductive adhesive at the exposed portion and are integrated and electrically conductive. Preferably it is.

  In the coaxial flat cable according to the present invention, it is preferable that the coaxial cable is in an electrically conductive state in which the outer conductors are bonded to each other and integrated in the alignment direction.

  Moreover, the coaxial flat cable which concerns on this invention WHEREIN: It is preferable that the said ground bar has a latching claw part which latches the outer conductor of each said coaxial cable.

  In addition, a coaxial flat cable manufacturing method according to the present invention that can solve the above-described problems includes a center conductor, an inner insulator disposed on the outer periphery thereof, an outer conductor disposed on the outer periphery of the inner insulator, and An arrangement step of arranging a plurality of coaxial cables having a jacket disposed on the outer periphery of the outer conductor in parallel, and squeezing the ends of the plurality of coaxial cables, and winding the plurality of strands in a spiral shape A lead-out step for exposing the outer conductor, an integration step for integrating the strands in the exposed portion of the outer conductor of the coaxial cable and making them electrically conductive, and an outer conductor of the coaxial cable. And a bonding step of bonding the ground bar with an adhesive made of resin.

  In the method for manufacturing a coaxial flat cable according to the present invention, the integration step is performed by electrically cutting the end portions of the outer conductor with a laser so that the strands are welded and integrated at the cut portion. It is preferable to be in a conductive state.

  Or in the manufacturing method of the coaxial flat cable which concerns on this invention, it is preferable that the said integration process makes it the state which welded and integrated the side part of the said strand which comprises the said external conductor, and was made into electrical conduction. .

Moreover, in the manufacturing method of the coaxial flat cable which concerns on this invention, it is preferable that the plating which consists of a low melting-point material given to the said strand is welded and integrated, and it is set as the electrical conduction state.
In addition, the low melting point material here means that it is a material having a lower melting point than the metal constituting the wire rod.

  Moreover, in the manufacturing method of the coaxial flat cable according to the present invention, the integration step is a state in which the side portions of the strands constituting the outer conductor are bonded and integrated with a conductive adhesive to be electrically conductive. It is preferable that

  Further, in the method for manufacturing a coaxial flat cable according to the present invention, after the side portions of the outer conductor are integrated and brought into an electrically conductive state, the outer conductor is cut to expose the inner insulator. preferable.

  Moreover, in the manufacturing method of the coaxial flat cable which concerns on this invention, it is preferable to adhere | attach the said external conductors of the said coaxial cable, and to make it the state electrically connected by integrating in an alignment direction.

  Moreover, in the manufacturing method of the coaxial flat cable which concerns on this invention, it is preferable to latch the aligned outer conductor of the coaxial cable by the latching claw part provided in the ground bar.

  The coaxial flat cable of the present invention includes a center conductor, an inner insulator disposed on the outer periphery thereof, an outer conductor disposed on the outer periphery of the inner insulator, and a plurality of jackets disposed on the outer periphery of the outer conductor. Coaxial cables are arranged in parallel, and the outer conductor is formed by spirally winding a plurality of strands, and the strands are integrated with each other at an exposed portion exposed from the outer sheath. It is bonded to the bar with an adhesive made of resin. In this way, the strands that are horizontally wound in a spiral form constituting the outer conductor are integrated and conducted without being unraveled at the exposed portion, so that the electrical connection state between each of the strands and the ground bar is determined. As a certainty, the contact resistance can be reduced and the grounding performance can be further improved.

  Also, the coaxial flat cable manufacturing method of the present invention exposes the outer conductor formed by spirally winding a plurality of strands by squeezing the ends of a plurality of coaxial cables arranged in parallel. Since the strands in the exposed portion are integrated with each other, and the ground bar is bonded to the outer conductor with an adhesive made of resin, the exposed portion of the spirally wound strand constituting the outer conductor Accordingly, the contact resistance between each element wire and the ground bar can be reduced, and the grounding performance can be further improved.

Hereinafter, examples of embodiments of a coaxial flat cable and a method for manufacturing the same according to the present invention will be described.
1A and 1B are diagrams showing an example of a coaxial flat cable according to the present invention. FIG. 1A is a plan view of the coaxial flat cable, and FIG. 1B is an end view as viewed from the F direction in FIG.

  As shown in FIG. 1, the coaxial flat cable 10 has a plurality of coaxial cables 11 which are signal cables for signal transmission, and these are arranged in parallel.

  As shown in FIG. 2, the coaxial cable 11 includes a center conductor 15, an inner insulator 14 disposed on the outer periphery of the center conductor 15, an outer conductor 13 disposed on the outer periphery of the inner insulator 14, And an insulating sheath 12 disposed on the outer periphery of the conductor 13, and these are arranged coaxially.

  As the coaxial cable 11, for example, a cable corresponding to the AWG 42 based on the standard of AWG (American Wire Gage) is used. In the coaxial cable 11 of the AWG 42, the central conductor 15 is formed by twisting, for example, seven silver-plated copper alloy strands 15a having an outer diameter of 0.025 mm, and the outer diameter is 0.075 mm. The inner insulator 14 is made of a fluororesin such as PFA that covers the outer peripheral surface of the center conductor 15 and is formed to have an outer diameter of 0.165 mm by extrusion coating. Further, the outer conductor 13 is formed to have an outer diameter of 0.225 mm by winding a strand 13a of, for example, a tin-plated copper alloy having an outer diameter of 0.03 mm around the outer peripheral surface of the inner insulator 14 in a spiral manner. . In addition, the jacket 12 is made of a fluororesin such as PFA that covers the outer peripheral surface of the outer conductor 13, and in the case of the AWG 42, it is formed with an outer diameter of 0.29 mm.

The end portion of the coaxial cable 11 is subjected to lead processing, and the center conductor 15, the inner insulator 14, and the outer conductor 13 are exposed in predetermined steps in order from the front end side.
The outer conductor 13 formed by spirally winding a plurality of strands 13a is an exposed portion E exposed from the jacket 12, and the strands 13a are welded to each other at an end portion and integrated. Yes. Moreover, in the side part in the exposed part E, it may be integrated by welding of the strands 13a (refer the welding location W of FIG. 9), or adhesion | attachment with an adhesive agent. It is more preferable in terms of conductive reliability that the conductive adhesive is integrated.

FIG. 3 is a sectional view taken along the line AA in FIG.
As shown in FIGS. 1 and 3, the coaxial flat cable 10 includes a first ground common to the exposed portions E of the aligned outer conductors 13 in a state where all the coaxial cables 11 are arranged in parallel. The bar 20 and the second ground bar 30 are sandwiched and fixed.

  As shown in FIG. 4, the first ground bar 20 is formed by bending both end portions of a band-shaped member made of a metal conductor at a substantially right angle along the longitudinal direction, so that a cross-section It is formed in a letter shape. A number of locking claw portions 23 arranged at a predetermined pitch are formed on both vertical wall portions 22 and 22. The outer conductor 13 of the coaxial cable 11 is inserted into the groove between the adjacent locking claws 23. Since the outer diameter of the outer conductor 13 entering the groove between the locking claws 23 is the same, the width of the groove is all constant according to the outer diameter of the outer conductor 13, and the coaxial cable 11 has a constant width. It is arranged at a substantially constant pitch by being sandwiched between the locking claws 23 having the same.

  Further, by providing the locking claws 23 on both the vertical wall portions 22, the coaxial cable 11 is positioned at two locations along the axial direction (left and right direction in FIG. 3), and the coaxial cable 11 is firmly held. Can be securely locked. Further, the first ground bar 20 has a U-shaped cross section, thereby ensuring mechanical strength.

  As shown in FIG. 3, the first ground bar 20 has at least one side locking claw 23 to lock the outer conductor 13, and the other side locking claw 23 to the outer conductor 13. Either the body 14 or the jacket 12 is locked. For example, in FIG. 3, both the locking claws 23, 23 lock the outer conductor 13. At least one side of the two rows of the locking claws 23 locks the outer conductor 13, so that the outer conductors 13 can be grounded to the first ground bar 20 in a lump.

  Between the first ground bar 20 and the outer conductor 13, a bonding member 24, which is an adhesive made of resin, is placed (or laminated), and the first ground bar 20 and the coaxial cable are formed by the bonding member 24. 11 is joined and fixed. As the bonding member 24, for example, an anisotropic conductive film (ACF), a conductive adhesive (conductive paste) or the like is used, but a non-conductive film (NCF) having no conductivity, a non-conductive adhesive (paste). Etc. can also be used. By these joining members 24, the first ground bar 20 and the outer conductor 13 are brought into contact with each other and fixed and electrically connected.

Further, as shown in FIG. 3, a second ground bar 30 that sandwiches the coaxial cable 11 in cooperation with the first ground bar 20 is provided.
As shown in FIG. 5, the second ground bar 30, as with the first ground bar 20, is bent at substantially right angles along the longitudinal direction at both edge portions of a band-shaped member made of a metal conductor, It is formed in a U-shaped cross section from the vertical wall portion 32. In the vertical wall portion 32, the locking claw portion 33 has a predetermined width and a predetermined width so that the coaxial cable 11 can be individually sandwiched corresponding to the locking claw portion 23 provided in the first ground bar 20. It is provided with a pitch.

  Further, as shown in FIGS. 3 and 5, the second ground bar 30 is along the longitudinal direction at a position on the inner surface side of the flat surface portion 31 and facing the locking claw portion 23 of the first ground bar 20. Two protruding ridges 34 are provided. The protrusion 34 can firmly press the outer conductor 13 of the coaxial cable 11 against the first ground bar 20 and can also increase the mechanical strength of the second ground bar 30 by acting as a rib.

  The coaxial cable 11 positioned by the first ground bar 20 is sandwiched and pressed by the second ground bar 30 from the opposite side of the first ground bar 20, so that the coaxial cable 11 is connected to the first ground bar 20 and the second ground bar 30. Can be firmly fixed. Therefore, the outer conductor 13 can be stably brought into contact with the first ground bar 20 and the second ground bar 30.

The ground bars 20 and 30 may have a simple elongated flat plate shape without providing a locking claw portion for locking the coaxial cable 11. For example, as shown in FIG. 6, it is sandwiched between flat ground bars 20a, 30a and is joined by a joining member 24 such as a conductive adhesive or a non-conductive adhesive provided on the opposing surfaces of the ground bars 20a, 30a. The ground bars 20a, 30a and the outer conductor 13 can be fixed and electrically connected. Thus, even when there is no locking claw or the like, the outer conductor is electrically integrated in advance, so the ground bars 20a, 30a and the outer conductor are joined with a conductive adhesive or a non-conductive adhesive. Therefore, stable ground performance can be ensured.
Even when a non-conductive resin is used for the bonding member 24, the bonding member 24 moves so as to fill the gap between the ground bars 20a, 30a and the outer conductor 13, so that the outer conductor 13 and the ground bars 20, 20a, 30, In the contact portion with 30a, the resin is pushed away, and a portion where the external conductor and the ground bar are in direct contact with each other is generated, and electrical connection between the ground bars 20, 20a, 30, 30a and the external conductor 13 is achieved. In this way, each outer conductor 13 can be grounded together in common to the ground bars 20, 20a, 30, 30a.

Next, a method for manufacturing the coaxial flat cable 10 will be described.
First, as shown in FIG. 7A, all the coaxial cables 11 constituting the coaxial flat cable 10 are arranged in parallel and held by a jig or an adhesive tape, and the end portions of the cables 11 are aligned ( Arrangement step).

Then, the end portions of all the coaxial cables 11 are subjected to extraction processing (extraction process). This lead-out process is performed using a laser processing machine such as a YAG laser or a CO ₂ laser. First, the wavelength and intensity of the CO ₂ laser are adjusted, and the outer sheath 12 of the coaxial cable 11 is separated from the end by a predetermined distance. Cut at a distant position, and as shown in FIG. 7B, the end side is pulled out and removed.

  Next, as shown in FIG. 7C, the wavelength and intensity of the YAG laser are adjusted, and the outer conductor 13 of the coaxial cable 11 is cut at a position closer to the end of the predetermined length than the cutting position of the jacket 12. The outer conductor 13 on the end side is pulled out and removed.

  In this way, at the end of the exposed portion E of the external conductor 13, the strands 13 a are welded together at the cutting location and integrated by cutting with the YAG laser. Thus, the plurality of strands 13a that are horizontally wound in a spiral shape are maintained in a unified state without being loosened and scattered (integration step). When welding with a YAG laser for welding, the output is set to a small value, for example, by setting the Q switch frequency higher, and the beam is reciprocated multiple times, thereby processing while releasing heat over time. If heat is not applied, the heat of fusion is transferred to the insulation coating, which damages the insulation coating. In particular, it is effective to use the second harmonic (λ = 532 nm) having a large absorption rate of tin and copper.

Thereafter, as shown in FIG. 7D, the wavelength and intensity of the CO ₂ laser are adjusted to cut the inner insulator 14 of the coaxial cable 11 at a position closer to the end portion, and the inner insulator 14 on the end portion side is removed. Pull out and remove. In this process, the extraction process of the coaxial cable 11 is completed. In this way, since all the coaxial cables 11 are processed together, the lead-out process can be performed efficiently.

  Then, after performing the above lead processing, the outer conductor 13 is sandwiched between the engaging claws 23 of the first ground bar 20 at the exposed portion E and positioned at a predetermined pitch (arrow B in FIG. 8). The first ground bar 20 is covered with the two ground bars 30 from above (arrow C in FIG. 8), and the central conductor 15 of the coaxial cable 11 protrudes forward from the first ground bar 20 and the second ground bar 30. The second ground bar 30 and the external conductor 13 are fixed with a conductive adhesive or a non-conductive adhesive (adhesion step).

  The adhesion of the outer conductor 13 to the ground bars 20, 30 is an anisotropy placed (or laminated) on the planar portion 21 of the first ground bar 20 and the planar portion 31 of the second ground bar 30. Adhesion is performed using a conductive film (ACF), a conductive adhesive (paste), a non-conductive film (NCF), a non-conductive adhesive (paste), or the like. If these joining members 24 are used, for example, since the heating temperature is lower than that for soldering (for example, 150 ° C. × 60 minutes), the thermal influence on the insulating layer due to heating can be reduced.

  As described above, the coaxial flat cable 10 of the above embodiment includes the center conductor 15, the inner insulator 14 disposed on the outer periphery thereof, the outer conductor 13 and the outer conductor 13 disposed on the outer periphery of the inner insulator 14. A plurality of coaxial cables 11 having a jacket 12 disposed on the outer periphery of the outer conductor 13 are arranged in parallel, and the outer conductor 13 is formed by spirally winding a plurality of strands 13 a and exposed from the jacket 12. In the exposed portion E, the strands 13a are integrated with each other and bonded to the common ground bars 20, 30 with an adhesive made of resin. Thus, since the strand 13a horizontally wound spirally constituting the outer conductor 13 is integrated without being unraveled at the exposed portion E, the contact state with the ground bars 20 and 30 is ensured. The contact resistance can be reduced and the grounding performance can be further improved.

  And the manufacturing method of the said coaxial flat cable 10 expose | bleaches the edge part of the several coaxial cable 11 arrange | positioned in parallel, and exposes the external conductor 13 formed by spirally winding the several strand 13a spirally. Since the strands 13a in the exposed portion E are integrated and the ground bars 20 and 30 are bonded to the outer conductor 13 with an adhesive made of resin, the strands 13a wound laterally in a spiral form constituting the outer conductor 13 Can be eliminated at the exposed portion E, thereby reducing the contact resistance with the ground bars 20 and 30 and further improving the grounding performance.

  In addition, in the said embodiment, although the strand 13a of the external conductor 13 wound horizontally by the spiral was welded and integrated in the cutting | disconnection location of the edge part in the exposed part E, integration of the strands 13a is carried out. It is not limited to the end portion, and may be integrated at the side portion in the exposed portion E.

  When the strand 13a is integrated at the side of the exposed portion E, before the outer conductor 13 is cut by the YAG laser, as shown in FIG. 13a are welded and integrated with each other by a YAG laser, and then the end portion side of the outer conductor 13 is cut by the YAG laser as shown in FIG. 9B. And remove. In this case, since the strand 13a of the outer conductor 13 is integrated by the YAG laser before the outer conductor 13 is cut by the YAG laser, cutting can be performed satisfactorily and the strand 13a can be released after the cutting. Can also prevent.

  In the above embodiment, the strands 13a are joined and integrated together by welding. However, the joining method is not limited to welding and may be integrated by bonding with a conductive adhesive.

  When joining by welding, the strand 13a itself may be melted and joined, but the strand 13a is plated with a melting point material such as a low melting point metal or a compound thereof (for example, tin). If they are, the wires 13a may be integrated by heating and welding the plated portions with a laser. In this case, the plating thickness is preferably about 0.5 μm to 2.0 μm. If it is thin, the welding effect is impaired, and if it is too thick, the flexibility of the wire itself is reduced.

  Further, before the outer conductors 13 of the plurality of coaxial cables 11 are bonded to the ground bars 20 and 30, the outer conductors 13 of the respective coaxial cables 11 are bonded with a conductive adhesive, and the gap is filled with the adhesive. They may be integrated in the alignment direction. In this way, the outer conductors 13 of the coaxial cable 11 can also be brought into conduction, and the grounding performance can be improved.

  In the above embodiment, the coaxial flat cable 10 in which the coaxial cables 11 made of signal cables for signal transmission are aligned has been described as an example. However, a power supply cable for power supply and a ground cable for grounding are used together with the signal cable. You may arrange.

  Moreover, the coaxial flat cable 10 of the said embodiment can take various forms, such as a case where a connector is attached to both ends, or a case where a connector is attached only at one end and the other end is connected to a substrate. Next, a coaxial flat cable with a connector in which a connector is attached to the end of the coaxial flat cable 10 will be described.

In FIG. 10, the schematic plan view of the one end side of the coaxial flat cable with a connector is shown. FIG. 11 is a cross-sectional view taken along the line DD in FIG. 10 corresponding to the connection position of the ground cable.
As shown in FIGS. 10 and 11, the coaxial flat cable 50 with a connector is such that each central conductor 15 at the end of the coaxial flat cable 10 is independent of a connection terminal 52 provided integrally with the connector housing 51. Connected. The center conductor 15 can be connected to the connection terminal 52 by collective soldering by pulse heat, for example.

  In addition, when performing batch soldering by pulse heat, uniform soldering can be performed between the central conductors 15 if the outer diameters of the central conductors 15 are substantially equal.

  As shown in FIG. 11, at the terminal portion of the coaxial flat cable 10, a shell 53 is attached to the connector housing 51 so as to cover the coaxial cable 11 placed on the connector housing 51. The second ground bar 30 is electrically connected via solder or conductive adhesive. The connection between the shell 53 and the second ground bar 30 is performed by, for example, providing an opening 53 a in a part of the shell 53 facing the second ground bar 30 and placing the shell 53 on the second ground bar 30. After covering 53, solder or a conductive adhesive is introduced from the opening 53a to fill the space between the lower surface of the shell 53 and the upper surface of the second ground bar 30 (reference numeral 54), and mutual conductive bonding is performed. This can be done by drawing.

  Such a coaxial flat cable with connector 50 has good grounding performance because the contact resistance between the outer conductor 13 of the coaxial flat cable 10 and the ground bars 20 and 30 is reduced as described above.

It is a figure which shows the example of the coaxial flat cable which concerns on this invention, (A) is a top view of a coaxial flat cable, (B) is the end elevation seen from F direction in (A). It is sectional drawing which shows the example of the coaxial cable used for the coaxial flat cable shown in FIG. It is sectional drawing in the front-end | tip part of the coaxial cable shown in FIG. 1, and the AA position in FIG. 1 (A). FIG. 2 is a perspective view of a first ground bar shown in FIG. 1. It is a perspective view of the 2nd ground bar shown in FIG. It is a disassembled perspective view which shows the example which uses a flat ground bar. It is a figure which shows the manufacturing process of the coaxial flat cable shown in FIG. 1, (A) is a top view which shows the arranged coaxial cable, (B) is a top view which shows the coaxial cable which removed the jacket, (C) Is a plan view showing a coaxial cable with the outer conductor cut and removed, and (D) is a plan view showing the coaxial cable with the inner insulator cut and removed. It is a disassembled perspective view which shows the manufacturing process of the coaxial flat cable shown in FIG. It is a figure which shows the other example of integration of the strands of an outer conductor, (A) is a top view of the coaxial cable which integrated the strand at the exposed part, (B) cuts and removes the edge part of an outer conductor It is a top view which shows the made coaxial cable. It is a schematic plan view of the one end side of the coaxial flat cable with a connector. Sectional drawing of the arrow DD direction in FIG. 10 applicable to the connection position of a ground cable is shown. It is a top view which shows the example of the conventional coaxial flat cable.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Coaxial flat cable 11 Coaxial cable 12 Outer sheath 13 Outer conductor 13a Wire 14 Internal insulator 15 Central conductor 20, 30 Ground bar 23, 33 Locking claw part 24 Joining member (adhesive)
E Exposed area

Claims (15)

  A plurality of coaxial cables having a central conductor, an inner insulator disposed on the outer periphery thereof, an outer conductor disposed on the outer periphery of the inner insulator, and a jacket disposed on the outer periphery of the outer conductor are disposed in parallel. In addition, the outer conductor is formed by spirally winding a plurality of strands, and in an exposed portion exposed from the jacket, the strands are integrated with each other and are electrically connected. A coaxial flat cable that is bonded to a common ground bar with an adhesive made of resin. The coaxial flat cable according to claim 1,
The coaxial flat cable, wherein the strands constituting the outer conductor are welded and integrated with each other at a cut portion in the exposed portion so as to be electrically connected. The coaxial flat cable according to claim 1,
A coaxial flat cable characterized in that side portions of the strands constituting the outer conductor are welded to each other at the exposed portion to be integrated and electrically connected. The coaxial flat cable according to claim 2 or 3,
A coaxial flat cable, wherein a plating made of a low-melting-point material applied to the element wire is welded and integrated into an electrically conductive state. The coaxial flat cable according to claim 1,
A coaxial flat cable characterized in that side portions of the strands constituting the outer conductor are bonded and integrated with each other by a conductive adhesive at the exposed portion and are electrically connected. The coaxial flat cable according to any one of claims 1 to 5,
The coaxial flat cable is characterized in that the external conductors are bonded to each other and integrated in the alignment direction so as to be electrically connected. The coaxial flat cable according to any one of claims 1 to 6,
The coaxial flat cable, wherein the ground bar has a locking claw portion that locks an outer conductor of each of the coaxial cables. A plurality of coaxial cables having a central conductor, an inner insulator disposed on the outer periphery thereof, an outer conductor disposed on the outer periphery of the inner insulator, and a jacket disposed on the outer periphery of the outer conductor are disposed in parallel. An alignment step to perform,
A lead-out process of exposing the outer conductor formed by subjecting the ends of the plurality of coaxial cables to a spiral and winding the plurality of strands in a spiral manner;
An integration step in which the strands in the exposed portion of the outer conductor of the coaxial cable are integrated and electrically conductive; and
And a bonding step of bonding a ground bar to an outer conductor of the coaxial cable with an adhesive made of a resin. It is a manufacturing method of the coaxial flat cable according to claim 8,
The coaxial process is characterized in that, in the integration step, the end portions of the outer conductor are cut by a laser so that the strands are welded together at the cut portions to be integrated and electrically conductive. Flat cable manufacturing method. It is a manufacturing method of the coaxial flat cable according to claim 8,
The method of manufacturing a coaxial flat cable, wherein the integration step includes welding and integrating the side portions of the strands constituting the outer conductor so as to be in an electrically conductive state. It is a manufacturing method of the coaxial flat cable according to claim 9 or 10,
A method for manufacturing a coaxial flat cable, characterized in that a plating made of a low-melting-point material applied to the element wire is welded and integrated into an electrically conductive state. It is a manufacturing method of the coaxial flat cable according to claim 8,
The method for producing a coaxial flat cable characterized in that the integration step is such that the side portions of the strands constituting the outer conductor are bonded and integrated with a conductive adhesive to be in an electrically conductive state. A method for manufacturing a coaxial flat cable according to any one of claims 8 to 12,
A method for manufacturing a coaxial flat cable, comprising: integrating the side portions of the outer conductor into an electrically conductive state; and cutting the outer conductor to expose the inner insulator. It is a manufacturing method of the coaxial flat cable according to any one of claims 8 to 13,
A method for manufacturing a coaxial flat cable, wherein the outer conductors of the coaxial cable are bonded together and integrated in an alignment direction to be electrically conductive. A method for manufacturing a coaxial flat cable according to any one of claims 8 to 14,
A method of manufacturing a coaxial flat cable, wherein the aligned outer conductors of the coaxial cable are locked by locking claws provided on a ground bar.

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