JP4910721B2 - Connection structure of multi-core cable, multi-core cable with connector and multi-core cable - Google Patents

Description

  The present invention relates to a multicore cable having a plurality of signal coaxial cables arranged in parallel and an insulating cable for power supply, the outer conductor of the coaxial cable being grounded, a multicore cable with a connector, and a multicore cable connection structure. .

  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. Multi-core cables are used.

  A coaxial cable used for a multi-core cable is configured by sequentially arranging a central conductor, an inner insulator, an outer conductor, and a jacket from the inside in a coaxial manner. The central conductor is formed, for example, by twisting seven copper alloy wires, and the outer surface 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, for example, winding a copper alloy wire in a spiral shape with a horizontal winding, and by wrapping two polyester tapes on the outer surface, for example, and fusing them together. It is covered. In addition, the copper vapor-deposited tape may be wound around the outer surface of the outer conductor with the copper vapor-deposited surface inside, and the outer conductor may be wound in two layers with the winding direction of the copper alloy wire reversed. In addition, a braided structure may be used.

  Various types of such multi-core cables have been proposed. For example, a plurality of signal transmission coaxial cables and a plurality of power transmission (power supply) cables are ribbons by heat fusion or adhesive. The one formed by adhering in a shape is known (for example, see Patent Document 1).

  In addition, for example, a multi-core cable in which a signal coaxial cable and a power supply coaxial cable are arranged in parallel at a predetermined pitch and integrated by attaching a tape having an adhesive layer on both surfaces thereof is also known ( For example, see Patent Document 2).

JP-A-62-86611 JP 2000-322943 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, because there is a demand for miniaturization and weight reduction, high-density mounting is required for multi-core cables used in such electronic devices, and there is a tendency to construct multi-core cables with extremely thin coaxial cables. It is in. Since the coaxial cable has a configuration including a center conductor, an inner insulator, an outer conductor, and a jacket, the cross-sectional area of the center conductor is small, and when a coaxial cable is used as a power supply cable like the cable of Patent Document 2, how many If a coaxial cable is not used, it is difficult to satisfy the performance as a power cable.

  In addition, the multi-core cable is used with its terminal portion connected and fixed to a connector terminal or a substrate having a predetermined pitch by conductive bonding such as soldering. For this reason, it is required that all the cables constituting the multi-core cable are arranged on the terminal by being aligned at a predetermined pitch. In particular, when the cables are extremely thin, the arrangement pitch of the cables is small, and positional displacement in sub-millimeter units tends to be a problem.

  Therefore, it is required that the cables constituting the multi-core cable be arranged with high accuracy. Therefore, it is important to fix each cable to the ground bar at a predetermined pitch.

  In addition, as a multi-core cable other than the above-mentioned Patent Documents 1 and 2, there is a cable in which a signal cable and a power cable are arranged separately, and only the signal cable is connected to the ground bar and fixed. When connecting the terminal portion, it is necessary to perform positioning with the signal cable and the power cable, and the workability is not good.

  Therefore, the present invention satisfies the performance of the signal cable and the power supply cable even with a very fine cable, and can easily and accurately connect the terminal portion to the connector terminal or the like. It aims at providing the connection structure of a cable and a multi-core cable.

A multi-core cable according to the present invention capable of solving the above-mentioned problems is a center conductor, an inner insulator disposed on the outer periphery of the center conductor, an outer conductor disposed on the outer periphery of the inner insulator, and the A plurality of coaxial cables having a jacket disposed on the outer periphery of the outer conductor;
A central conductor, and an insulated cable having a jacket disposed on the outer periphery of the central conductor, and are arranged in parallel;
The cross-sectional area of the central conductor of the insulated cable is larger than the cross-sectional area of the central conductor of the coaxial cable;
The difference between the outer conductor diameter of the coaxial cable and the outer diameter of the outer sheath of the insulated cable is within ± 10%,
The jacket of the insulated cable has a thickness of 0.05 mm or more;
The exposed portion of the outer conductor of the coaxial cable and the jacket of the insulated cable are sandwiched between a common ground bar and fixed with solder, and the exposed portion is conductively connected to the ground bar.

  Moreover, the multi-core cable with a connector according to the present invention that can solve the above-mentioned problem includes the multi-core cable according to the present invention, and each central conductor of the coaxial cable and the central conductor of the insulated cable are connected to the connector. It is connected to a connection terminal.

Moreover, the connection structure of the multi-core cable according to the present invention that can solve the above-mentioned problems includes the multi-core cable according to the present invention, wherein each central conductor of the coaxial cable and the central conductor of the insulated cable are connected. It is connected to a terminal.
The connection structure of the multi-core cable is, for example, a connection structure to a printed circuit board (FPC: Flexible Printed Circuit, PWB: Printed Wire Board, etc.).

  The multi-core cable of the present invention includes a plurality of coaxial cables provided with a center conductor, an inner insulator, an outer conductor, and a jacket in order from the center to the outside, and the center conductor and a jacket disposed on the outer periphery thereof. The insulated cable is arranged in parallel. Since the insulated cable is composed of a central conductor and a jacket, it has a structure that can easily ensure a large cross-sectional area of the central conductor, and even a very thin cable can satisfy the performance as a power cable.

  Further, since the outer conductor of the coaxial cable and the jacket of the insulated cable are sandwiched and fixed by the ground bar, the arrangement state of the cables is not disturbed when the terminal portion is connected to the connector terminal or the like.

  Furthermore, in the multi-core cable with a connector provided with the multi-core cable of the present invention, the central conductor of the coaxial cable and each central conductor of the insulated cable are connected to the connection terminal of the connector, and the coaxial cable for signal and the insulation for power supply The cable is connected with high accuracy and is a highly reliable multi-core cable with a connector excellent in signal transmission performance and power supply performance. Moreover, the connection structure of the multi-core cable in which the multi-core cable of the present invention is connected to the printed circuit board has the same effect.

Hereinafter, the example of embodiment of the connection structure of the multicore cable which concerns on this invention, the multicore cable with a connector, and a multicore cable is demonstrated.
1A and 1B are diagrams showing an example of a multi-core cable according to the present invention, in which FIG. 1A is a plan view of the multi-core cable, and FIG. 1B is an end view as viewed from the F direction in FIG. In FIG. 1A, the second ground bar 30 to be described later is not shown in order to simplify the drawing. FIG. 5 shows an enlarged cross-sectional view near the arrow V in FIG.

  As shown in FIG. 1, the multi-core cable 10 includes a plurality of (in the present embodiment, 37) signal coaxial cables (hereinafter referred to as coaxial cables) 11 and at least one power insulating cable (hereinafter referred to as a coaxial cable). 40) and these are arranged in parallel.

The coaxial cable 11 is a signal cable for signal transmission, and 37 cables are provided in this embodiment.
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 external 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 AWG 44 based on the AWG (American Wire Gage) standard is used. In the coaxial cable 11 of the AWG 44, the central conductor 15 is formed by twisting seven strands 15a of silver-plated copper alloy having an outer diameter of 0.020 mm, for example. The internal 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 a thickness of 0.04 mm by extrusion coating. Further, the outer conductor 13 is formed to have an outer diameter of 0.21 mm, for example, by winding a strand 13a of a tin-plated copper alloy around the outer peripheral surface of the inner insulator 14 in a spiral manner. In addition, the outer cover 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 44, the outer cover 12 is formed with an outer diameter of 0.26 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.

Further, three insulated cables 40 are provided in the present embodiment.
As shown in FIG. 3, the insulated cable 40 has a center conductor 41 and an insulating jacket 42 disposed on the outer periphery thereof, and is configured by coaxially arranging these.

  For example, when the coaxial cable 11 has a size corresponding to AWG 44, the insulated cable 40 is a cable corresponding to AWG 38 according to the AWG standard, and the central conductor 41 is, for example, a tin-plated copper alloy wire The outer cover 42 is made of a fluororesin such as PFA that covers the outer peripheral surface of the central conductor 41, and has an outer diameter of 0.21 mm. The diameter of the portion of the center conductor 41 is 0.11 mm, and the thickness of the jacket 42 is 0.05 mm. The thickness of the jacket 42 is thicker than the thickness of the inner insulator 14 of the coaxial cable 11 of the AWG 44.

  The insulated cable 40 is a cable used for power supply, and the cross-sectional area of the central conductor 41 is larger than the cross-sectional area of the central conductor 15 of the coaxial cable 11. Since the insulated cable 40 has a structure including the center conductor 41 and the jacket 42, it is easier to ensure a larger cross-sectional area of the center conductor 41 than the coaxial cable 11.

  Since the jacket 42 of the insulated cable 40 is sandwiched and fixed by the two ground bars 20 and 30 together with the outer conductor 13 of the coaxial cable 11, it is formed to have an outer diameter equivalent to the layer of the outer conductor 13 of the coaxial cable 11. ing. Further, the jacket 42 is sufficiently large so that the jacket 42 is not melted and the insulation characteristics cannot be maintained due to heat generated when the ground bars 20 and 30 are fixed to the coaxial cable 11 and the insulated cable 40. Thickness.

  In addition, the end portion of the insulated cable 40 is also exposed, and the center conductor 41 is exposed to a predetermined length (for example, a length equivalent to the center conductor 15 of the coaxial cable 11) on the end side in the length direction.

  As shown in FIG. 1, the multi-core cable 10 is aligned with all the coaxial cables 11 and the insulated cables 40 arranged in parallel with the center conductor 15 and the center conductor 41 aligned at a predetermined pitch. The outer conductor 13 and the outer jacket 42 are sandwiched and fixed between two common ground bars 20 and 30.

  These ground bars 20 and 30 have such a length that they can contact over the outer conductor 15 of all the coaxial cables 11 and the central conductor 41 of the insulated cable 12 that are in contact with each other or arranged in parallel at a predetermined interval. It is formed in a square plate shape with a constant thickness, and is formed from, for example, a conductive metal plate such as a copper plate.

  Further, as shown in FIG. 4, a joining member 24 is provided in advance on the opposing surfaces of the ground bars 20, 30, and the ground bars 20, 30 and the cables 11, 40 are fixed by the joining member 24. (See FIG. 5). As the bonding member 24, for example, plate solder can be used, but in addition to the plate solder, an anisotropic conductive film (ACF), a non-conductive film (NCF), or the like can also be used. By these joining members 24, the ground bars 20 and 30 and the outer conductor 13 of the coaxial cable 11 are fixed and simultaneously electrically connected. Even when a non-conductive film is used for the joining member 24, the joining member 24 moves so as to fill the gaps between the ground bars 20 and 30 and the cables 11 and 40 as shown in FIG. A portion that directly contacts the ground bars 20, 30 is generated in a part of the circumferential direction of 13, and electrical connection between the ground bars 20, 30 and the external conductor 13 is achieved. In this way, the outer conductors 13 can be grounded together in common with the ground bars 20 and 30.

  Further, although the joining member 24 does not adhere to the jacket 42 of the insulated cable 40, the joining member 24 moves and solidifies so as to fill the periphery of the jacket 42, so that the insulated cable 40 is orthogonal to the axial direction. It will prevent the movement of the direction. That is, the insulated cable 40 is fixed at least in the direction orthogonal to the axial direction by the ground bars 20 and 30 and the joining member 24.

  A form in which solder is used for both the coaxial cable 11 and the insulated cable 40, a form in which solder is used for the coaxial cable 11 and ACF or NCF is used for the insulated cable 40, the coaxial cable 11 and the insulated cable A configuration in which ACF or NCF is used for both of the members 40 can be employed, but in any configuration using solder, when the joining member (solder) 24 is thermally melted, the ground bars 20 and 30 are used. May be heated once by pulse heat or the like.

  Moreover, it is preferable that the outer diameter of the outer conductor 13 of the coaxial cable 11 and the outer diameter of the jacket 42 of the insulated cable 40 are substantially equal (within ± 10%). Thereby, since the gaps with the ground bars 20 and 30 are aligned, it is easy to join them, and both the coaxial cable 11 and the insulated cable 40 can be firmly fixed at an accurate pitch.

Next, a method for manufacturing the multi-core cable 10 will be described.
First, all the cables 11 and 40 constituting the multi-core cable 10 are arranged in parallel and held by a jig or a laminate tape. For example, as shown in FIG. 1, the cables 11 and 40 are arranged from the first center (upper end position in FIG. 1) to the third core, and the power insulation cable 40 is used. Is the signal coaxial cable 11. Further, the positions of the ends of all the cables 11 and 40 are matched.

Then, the end portions of all the cables 11 and 40 are subjected to the lead processing. 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 jacket 12 of the coaxial cable 11 is moved from the end to a predetermined position. Cut at a distance, and pull out the end to remove. When applying the CO ₂ laser, a predetermined length is bent and retracted from the end so as not to hit the insulated cable 40.

  Next, by adjusting the wavelength and intensity of the YAG laser, the outer conductor 13 of the coaxial cable 11 is cut at a position closer to the end portion by a predetermined length from the jacket cutting position, and the outer conductor 13 on the end side is pulled out and removed. To do. At this time, the insulated cable 40 may or may not be retracted.

Further, by adjusting the wavelength and intensity of the CO ₂ laser, the inner insulator 14 of the coaxial cable 11 and the outer sheath 42 of the insulated cable 40 are further cut at a position closer to the end, and the inner insulator 14 on the end side and The outer cover 42 is pulled out and removed. Thus, since all the cables 11 and 40 are processed together, a lead-out process can be performed efficiently.

  Then, after performing the lead-out process, the outer conductor 13 and the jacket 42 are sandwiched between the ground bars 20 and 30 and positioned at a predetermined pitch, and the ground bars 20 and 30 and the outer conductor 13 and the jacket 42 are joined by the joining member 24. Fix it. When the joining member 24 is solder, the ground bars 20 and 30 are heated by pulse heat or the like, and the solder is thermally melted and fixed. Note that when ACF or NCF or the like is used instead of solder, the heating temperature is lower than that of soldering, so that the influence of heat on the insulating layer due to heating can be reduced. When the outer sheath 42 is substantially equal to the diameter of the coaxial cable 11 up to the outer conductor 13, the outer sheath 42 is thicker than the inner insulator 14 of the coaxial cable 11, so that the solder is melted. Since the insulation cable 40 has a sufficient thickness against the heat at the time, the insulation characteristics of the insulation cable 40 are kept good.

  As described above, the multi-core cable 10 of the above-described embodiment includes the plurality of signal coaxial cables 11 including the center conductor 15, the inner insulator 14, the outer conductor 13, and the jacket 12 in order from the center toward the outside. A central conductor 41 and a power insulating cable 40 having a jacket 42 disposed on the outer periphery thereof are arranged in parallel. And since the insulated cable 40 consists of the center conductor 41 and the jacket 42, it is a structure which is easy to ensure the cross-sectional area of the center conductor 41, and satisfy | fills the performance as a power cable even if it is an ultrafine cable as mentioned above. can do.

Further, since the outer conductor 13 of the coaxial cable 11 and the jacket 42 of the insulated cable 40 are sandwiched and fixed between the ground bars 20 and 30, all the cables 11 and 40 constituting the multi-core cable 10 can be aligned with high accuracy. And the arrangement state is not disturbed. Therefore, it is possible to accurately connect the terminal portion of the multi-core cable 10 to the connector terminal or the like. Further, a large cross-sectional area of the central conductor 41 of the insulated cable 40 is ensured and the insulation characteristics are also maintained well, and the performance as a power cable is extremely good.
Note that the number and arrangement of the various cables in the above embodiment are examples, and can be changed as appropriate.

  In particular, if the diameter of the outer conductor 13 portion of the coaxial cable 11 and the outer diameter of the insulated cable 40 are substantially equal, both can be handled in terms of dimensions at locations fixed to the ground bars 20, 30. High degree of freedom.

  The multi-core cable 10 of the above-described embodiment can take various forms such as a case where connectors are attached to both ends, a case where only one end is attached, and the other end is connected to a substrate. Next, a multi-core cable with a connector in which a connector is attached to the end of the multi-core cable 10 will be described.

In FIG. 6, the schematic plan view of the one end side of the multi-core cable with a connector is shown. FIG. 7 is a cross-sectional view taken along the arrow VII-VII in FIG. 6 corresponding to the connection position of the ground cable.
As shown in FIGS. 6 and 7, the connector-equipped multi-core cable 50 has the center conductors 15 and 41 at the ends of the multi-core cable 10 respectively connected to the connection terminals 52 provided integrally with the connector housing 51. Connected independently. The center conductors 15 and 41 can be connected to the connection terminal 52 by, for example, batch soldering by pulse heat.

  As shown in FIG. 7, at the terminal portion of the multi-core cable 10, the shell 53 is a connector so as to cover the cables 11 and 40 (the coaxial cable 11 is shown in FIG. 7) placed on the connector housing 51. The shell 53 is attached to the housing 51, and the shell 53 is electrically connected to the ground bar 30 via solder or ACF. The shell 53 and the ground bar 30 are connected to each other by, for example, providing an opening 53 a in a part of the shell 53 facing the ground bar 30 and covering the ground bar 30 with the shell 53. This can be done by introducing solder or ACF from the opening 53a and filling the space between the lower surface of the shell 53 and the upper surface of the ground bar 30 (reference numeral 54) and conducting mutual conductive bonding.

  When the multi-fiber cable 50 with a connector configured as described above is connected to the receptacle, it is connected to the ground circuit in the vicinity of both ends in the longitudinal direction of the shell 53. When the shell 53 is connected to the ground circuit, the ground bars 20 and 30 of the outer conductor 13 of the coaxial cable 11 are grounded via the shell 53.

In addition, in the multi-core cable 10 before being connected to the connection terminal 52, the outer conductor 13 of the coaxial cable 11 and the jacket 42 of the insulated cable 40 are fixed by being sandwiched between the ground bars 20 and 30. Are arranged with high precision, and can be positioned with high precision with respect to each connection terminal 52 without disturbing the arrangement. In addition, as described above, the performance of the insulated cable 40 as a power cable is extremely good.
Therefore, the connector-equipped multi-core cable 50 including the multi-core cable 10 according to the present invention has the signal coaxial cable 11 and the power supply insulated cable 40 connected to each connection terminal 52 with high precision, It has excellent power supply performance and high reliability.

  Moreover, the structure which connects the multi-core cable 10 which concerns on this invention to the connection terminal of FPC or PWB is also possible. It can also be connected to the circuit of the device body via the FPC.

It is a figure which shows the example of the multi-core cable which concerns on this invention, (A) is a top view of a multi-core 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 multi-core cable shown in FIG. It is sectional drawing which shows the example of the insulated cable used for the multi-core cable shown in FIG. It is a disassembled perspective view which shows the example which joins the ground bar shown in FIG. 1 to each cable. It is an expanded sectional view of the arrow V vicinity of FIG. It is a schematic plan view of the one end side of the multicore cable with a connector which concerns on this invention. Sectional drawing of the arrow VII-VII position in FIG. 6 applicable to the connection position of a coaxial cable is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Multi-core cable 11 Signal coaxial cable 12 Coaxial cable jacket 13 Coaxial cable outer conductor 14 Coaxial cable inner insulator 15 Coaxial cable center conductor 20, 30 Ground bar 40 Power supply insulation cable 41 Insulated cable center conductor 42 Insulated cable jacket 50 Multi-core cable with connector 51 Connector housing 52 Connection terminal 53 Shell

Claims (3)

A plurality of coaxials having a center conductor, an inner insulator disposed on the outer periphery of the center conductor, an outer conductor disposed on the outer periphery of the inner insulator, and a jacket disposed on the outer periphery of the outer conductor Cable and
A central conductor, and an insulated cable having a jacket disposed on the outer periphery of the central conductor, and are arranged in parallel;
The cross-sectional area of the central conductor of the insulated cable is larger than the cross-sectional area of the central conductor of the coaxial cable;
The difference between the outer conductor diameter of the coaxial cable and the outer diameter of the outer sheath of the insulated cable is within ± 10%,
The jacket of the insulated cable has a thickness of 0.05 mm or more;
An exposed portion of the outer conductor of the coaxial cable and an outer sheath of the insulated cable are sandwiched between a common ground bar and fixed by solder, and the exposed portion is conductively connected to the ground bar. cable. A multi-core cable according to claim 1 ,
A multi-core cable with a connector, wherein each central conductor of the coaxial cable and a central conductor of the insulated cable are connected to a connection terminal of the connector . A multi-core cable according to claim 1 ,
A multi-core cable connection structure, wherein each central conductor of the coaxial cable and the central conductor of the insulated cable are connected to a connection terminal.

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