JP2005317334A - Extra-fine coaxial cable assembly and terminal connection method of extra-fine coaxial cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily enable insertion into a narrow part of electronic equipment as being used for the electronic equipment, and to improve a piece-part productivity of the assembly and an assembly productivity of the electronic equipment. <P>SOLUTION: The extra-fine coaxial cable assembly 1 is such that a plurality of extra-fine coaxial cables 3 each made of a center conductor 9, an insulation layer 11 covered around an outer periphery of the center conductor 9, an outer conductor 13 shielded around an outer periphery of the insulation layer 11 and a jacket 15 covering an outer periphery of the outer conductor 13 are arranged, and an FPC7 having flexibility is arranged at both end sides in a longitudinal direction of the plurality of the extra-fine coaxial cables 3. Furthermore, each outer conductor 13 exposed with a part of the jacket 15 removed is connected to a ground circuit 17 of each FPC7 by soldering in a condition leaving the jackets 15 of the both terminals of the extra-fine coaxial cables 3, respectively, as a structure of a terminal connection part for connecting each FPC7 in free bending. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a micro coaxial cable assembly and a terminal connection method of a micro coaxial cable, and more particularly to a micro coaxial cable assembly used as a wiring material of an electronic device such as a personal computer, a mobile phone, and a digital camera, and a terminal connection method of the micro coaxial cable.

  In recent years, there has been an increasing demand from the market for micro-coaxial cables and assemblies widely used in medical equipment as wiring materials for liquid crystal monitors of electronic equipment such as personal computers, mobile phones, digital cameras, and the like in recent years. The use of ultra-fine coaxial cables has increased because the stable transmission characteristics of coaxial cables and the high degree of freedom of assembly shapes that come from thin and flexible structures have been matched to needs.

  Referring to FIG. 6, a notebook personal computer 101 and a mobile phone are composed of a main body 103 that houses a substrate, a motherboard, and the like, and an LCD panel 105 that includes a liquid crystal monitor (LCD). It is provided so as to be foldable or capable of three-dimensional operation via the hinge portion 107.

  Conventionally, a wiring material 109 used to send power and signals between the main body 103 and the LCD panel 105 is provided at the hinge portion 107 so as to cross the axial direction as shown in FIG. FPCs (Flexible Printed Circuits), shielded FPCs, and the like that are mostly flexible have been used.

  However, as the LCD panel 105 in recent years has moved from two to three dimensions, and the data transmission speed has improved as the resolution of the LCD panel 105 has increased, the wiring material 109 also has a high frequency. It is required that the wiring material 109 has excellent characteristics and EMI countermeasures. In this respect, a general coaxial cable is not used because it becomes thick. However, the ultrafine coaxial cable 113 has a thin and flexible structure as described above, and has the above-mentioned needs compared to other materials. This is an advantageous wiring material.

  Referring to FIG. 7, a conventional micro coaxial cable 113 has a structure in which seven center conductors 115 having a diameter of 0.025 mm or 0.03 mmφ and a circular section are twisted, and fluorine is disposed on the outer periphery of the center conductor 115. An insulating layer 117 of, for example, Teflon (registered trademark) resin as a system resin is applied, and the outer periphery of this insulating layer 117 is twisted with 25 outer circular conductors 119 having a diameter of 0.025 mm or 0.03 mmφ. Further, the outer conductor 119 is covered with a jacket 121 of, for example, Teflon (registered trademark) resin as a fluorine resin.

  Further, as the micro coaxial cable assembly 123 of the notebook personal computer 101, as shown in FIG. 8, the above-described numerous micro coaxial cables 113 are arranged in parallel at a pitch of 0.5 mm, for example, and both sides thereof are bundled with a tape 125. The flat cable processing to unitize the sandwich is given.

Further, each of the micro coaxial cables 113 on both ends in the longitudinal direction of the micro coaxial cable assembly 123 is connected to an FPC 127 for connecting to the substrate. That is, as shown in FIGS. 9 and 10, the jackets 121 at both ends of each of the numerous micro coaxial cables 113 are removed to expose the outer conductor 119, and the outer conductor 119 is exposed to the shield portion 129 of the FPC 127. It is pressed by the ground bar 131 and soldered together by the solder 133. Further, the center conductor 115 of each micro coaxial cable 113 is connected to each connection terminal portion 135 of the FPC 127 (see, for example, Patent Document 1 and Patent Document 2).
JP 2003-45244 A JP 2001-307556 A

  By the way, conventionally, when assembling the above-described notebook personal computer 101, for example, the insertion hole 111 of the hinge portion 107 has a diameter of about 3 to 5 mmφ. The assembly 123 has a problem that it cannot be passed through the insertion hole 111.

  The FPC 127 is flexible and can be easily rounded, but the ground bar 131 is made of metal and cannot be easily bent because it is soldered. Even if it is bent, the ground bar 131 has rounded ridges, so that the FPC 127 cannot be expanded to the original state, and further, the mechanical strength of the soldered portion is reduced and dimensional problems are caused. . Further, if the FPC 127 is forcibly passed through the insertion hole 111, the possibility of damage to the micro coaxial cable 113 and the like increases.

  Therefore, as shown in FIG. 11, when the size dimension of the FPC 127 is A × B and the hole diameter of the insertion hole 111 is C, the hole diameter C is the smaller of the dimensions A and B. Must be larger than the dimensions. The diversification of notebook PCs 101 has changed in preference for lighter, smaller and smaller designs, and the size, shape, and space of the hinge part 107 corresponding to the movable part of the notebook PC 101 are often regarded as problems due to design restrictions. Therefore, increasing the hole diameter C as described above goes against the market needs.

  Therefore, subassembly is performed in advance in which the micro coaxial cable assembly 123 is passed through the insertion hole 111 of the hinge 107, and the main body is formed using the hinge 107 with the sub coaxial cable assembly 123 thus subassembled. 103 and the LCD panel 105 need to be connected.

  First, as shown in FIG. 12A, the FPC 127 is a sub-assembly method of the hinge portion 107 with the micro coaxial cable assembly 123 (in other words, a sub-assembly method of the micro coaxial cable assembly 123 with the hinge portion). Is connected to one end of a number of micro coaxial cables 113.

  Next, the end of the micro coaxial cable assembly 123 on the side not having the FPC 127 is rounded and passed through the insertion hole 111 of the hinge portion 107 as shown in FIG. 12B, and the FPC 127 is attached. The ground bar 131 is collectively soldered to the outer conductor 119 of each of the many fine coaxial cables 113 on the non-side.

  Furthermore, as shown in FIG. 12C, the outer conductors 119 of a number of micro coaxial cables 113 are soldered together between the ground bar 131 and the shield part 129 of the FPC 127, and The central conductor 115 of the coaxial cable 113 is connected to each connection terminal portion 135, thereby connecting to the FPC 127.

  In the above-described subassembly processing, there are the following problems.

  (1) When the end portion of the micro coaxial cable assembly 123 on the side not having the FPC 127 is passed through the insertion hole portion 111 of the hinge portion 107, the end portion on the side not having the FPC 127 is bundled or rounded. There was a problem that the pitch of many micro coaxial cables 113 was shifted. In other words, since the FPC 127 side is also arranged at the same pitch, if the pitch between the central conductor 115 and the FPC 127 is shifted, it is necessary to perform soldering after arranging the arrangement, which reduces productivity. There was a point.

  (2) If the micro coaxial cable assembly 123 is connected to the FPC 127 with the hinge portion 107 attached, the hinge portion 107 becomes an obstacle and the FPC 127 cannot be connected to both ends of the micro coaxial cable assembly 123 at the same time. There was a problem that the nature did not go up.

  (3) Since, for example, the entire assembly delivery date of the notebook personal computer 101 as an electronic device depends on the delivery time of the hinge portion 107, there is a problem that the yield of assembly parts is lowered.

  The present invention has been made to solve the above-described problems.

The micro coaxial cable assembly of the present invention comprises a central conductor, an insulating layer coated on the outer periphery of the central conductor, an outer conductor shielded on the outer periphery of the insulating layer, and a jacket covering the outer periphery of the outer conductor. Micro coaxial cable,
An FPC having flexibility, the FPCs disposed on both ends in the longitudinal direction of the plurality of micro coaxial cables;
A terminal connection portion for connecting each external conductor exposed by removing a part of the jacket in a state where the jackets of both ends of the micro coaxial cables are left, to the ground circuit of each FPC. To do.

  In the micro coaxial cable assembly of the present invention, it is preferable that the connection between each external conductor and the ground circuit in the terminal connection portion is soldering in the micro coaxial cable assembly.

  As can be understood from the means for solving the above-described problems, according to the present invention, in the micro coaxial cable assembly, flexible FPCs are folded at both ends in the longitudinal direction of a plurality of micro coaxial cables. Since each jacket is removed and exposed in a state where the jackets of both ends of each of the micro coaxial cables are left so as to be bendable, each of the exposed outer conductors is not scattered. And the ground circuit of the FPC are almost uniform, and can be connected to the FPC without causing variations in the shield.

  In addition, when this micro coaxial cable assembly is used in an electronic device, the FPC can be rolled and inserted into a narrow part of the electronic device, so that the electronic device can be easily assembled and the assembly productivity of the electronic device can be increased. Can be improved.

  Further, the micro coaxial cable assembly does not need to be sub-assembled with, for example, a hinge part of an electronic device as in the prior art, and can be processed individually, so that both ends in the longitudinal direction of a plurality of micro coaxial cables Since the FPC can be connected and processed simultaneously, the productivity of the micro coaxial cable assembly can be improved.

  In addition, for the reasons described above, the micro coaxial cable assembly can be processed individually, so that the entire assembly delivery date of the electronic equipment is not affected by, for example, the delivery time of the hinge portion as in the past, so that the yield of assembly parts can be reduced. The problem of lowering can be solved.

  Embodiments of the present invention will be described below with reference to the drawings.

  Referring to FIG. 1 to FIG. 3, the micro coaxial cable assembly 1 according to this embodiment will be described as a case where it is assembled as a flat cable type liquid crystal panel cable assembly of an electronic device such as a notebook computer. The coaxial cable assembly 1 is subjected to flat cable processing in which a large number of micro coaxial cables 3 are arranged in parallel at a pitch of 0.4 mm, for example, and both sides thereof are bundled and unitized into a sandwich by a tape 5.

  Further, FPC 7 (Flexible Printed Circuit) which is used as a connector terminal and has flexibility and flexibility is disposed on both ends in the longitudinal direction of each micro coaxial cable 3, and the FPC 7 is bent to be foldable. Both terminals of each microfine coaxial cable 3 are connected by a terminal connection portion. Details of the terminal connection unit will be described later. In addition, in the micro coaxial cable assembly 1 of this embodiment, although it is illustrated in a small number in FIG. 1, 40 micro coaxial cables 3 are used.

  Referring to FIG. 4, each of the micro coaxial cables 3 has seven circular conductors 9 having a diameter of 0.025 mm or 0.03 mmφ twisted, and a fluorine-based resin is provided on the outer periphery of the central conductor 9. For example, an insulating layer 11 of Teflon (registered trademark) resin is applied, and the outer periphery of the insulating layer 11 is twisted with 27 outer circular conductors 13 having a diameter of 0.025 mm or 0.03 mmφ. The outer conductor 13 is shielded, and the outer periphery of the outer conductor 13 is covered with a jacket 15 of, for example, Teflon (registered trademark) resin as a fluorine resin.

  Referring to FIGS. 1, 2 and 3 again, as a configuration of the terminal connecting portion, a part of the jacket 15 is removed in a state where the jackets 15 of both ends of the micro coaxial cables 3 are left. Then, each outer conductor 13 is exposed. Each exposed external conductor 13 is connected to the ground circuit 17 of the FPC 7 by soldering 19 with solder 19 in an independent state. The central conductor 9 of each micro coaxial cable 3 is connected to each connection terminal portion 21 of the FPC 7.

  With the above configuration, the micro coaxial cable assembly 1 according to this embodiment has a jacket 15 at the end of each micro coaxial cable 3 when both ends of each micro coaxial cable 3 are connected to the ground circuit 17 of the flexible FPC 7. Since a part of the jacket 15 is removed in a state where the jacket 15 is left, the installation state of the exposed external conductors 13 and the ground circuit 17 becomes substantially uniform by the remaining terminal portion of the jacket 15, The soldering operation is performed without causing variations in the shield.

  Incidentally, when the outer conductors 13 are collectively soldered to the solder plate 17 by the ground bar as in the prior art, the terminal portions of the outer conductors 13 are pressed by the ground bar, so that each micro coaxial cable 3 Since the end faces of the terminals are aligned, the soldering operation is performed without causing variations in the shield. However, if the ground bar is simply eliminated in this embodiment, the external conductors 13 will be scattered and the installation state of the external conductors 13 and the ground circuit 17 will not be uniform. This will cause variations in the shield.

  However, in this embodiment, as described above, there is no variation in the shield, and as shown in FIG. 3, the outer conductors 13 of the respective micro coaxial cables 3 are individually soldered. Since it is soldered to the plate 17, the FPC 7 can be easily rounded.

  When, for example, the above-described notebook computer described in the prior art is assembled using the micro coaxial cable assembly 1 of this embodiment, one end of the micro coaxial cable assembly 1 is used as shown in FIG. The side FPC 7 is easily rounded and passed through the insertion hole 25 of the hinge part 23. Next, as shown in FIG. 5B, the rounded FPC 7 is easily expanded to the original state and then connected to a connector terminal (not shown) on the LCD panel side. The end-side FPC 7 is connected to a connector terminal (not shown) on the main body side of the notebook personal computer.

  Even if one FPC 7 of the micro coaxial cable assembly 1 is bundled or rolled, the center conductor 9 of each of the micro coaxial cables 3 is already connected to the connection terminal portion 21 of the FPC 7, so that The problem of pitch deviation is eliminated.

  Further, the liquid crystal panel cable 1 does not need to be sub-assembled with the hinge portion 23 as in the prior art, and can be processed as a single product. Therefore, the FPC 7 as a connector terminal is provided at both ends of the liquid crystal panel cable 1. Can be processed simultaneously, so that the productivity of the liquid crystal panel cable 1 can be improved.

  Further, since the liquid crystal panel cable 1 can be processed individually, the assembly time of the entire notebook computer as an electronic device, for example, is not affected by the delivery time of the hinge portion 23 as in the prior art. The problem of lowering is eliminated.

It is a top view of the micro coaxial cable assembly of this embodiment of this invention. It is the top view which expanded a part of terminal connection part of the right side of the micro coaxial cable assembly of FIG. It is sectional drawing of the arrow III-III line | wire of FIG. It is sectional drawing of the micro coaxial cable assembly of embodiment of this invention. (A), (B) is a state explanatory view when attaching to an electronic device using the micro coaxial cable assembly of the embodiment of the present invention. It is a perspective view of the notebook personal computer which shows the usage example of a microfine coaxial cable. It is sectional drawing of the conventional micro coaxial cable. It is sectional drawing of the assembly of the conventional micro coaxial cable. It is the top view which expanded a part of terminal connection part of the right side of the assembly of the micro coaxial cable of FIG. It is sectional drawing of the XX line of FIG. It is a schematic explanatory drawing which shows the dimension of FPC of the assembly of the conventional micro coaxial cable, and the insertion hole part of the hinge part of an electronic device. (A), (B), (C) is a state explanatory drawing when attaching to an electronic device using the conventional micro coaxial cable assembly.

Explanation of symbols

1 Micro Coaxial Cable Assembly 3 Micro Coaxial Cable 5 Bundled Tape 7 FPC
9 Central conductor 11 Insulating layer 13 Outer conductor 15 Jacket 17 Ground circuit 19 Solder 21 Connection terminal part 23 Hinge part 25 Insertion hole part

Claims (2)

A micro coaxial cable comprising a central conductor, an insulating layer covering the outer periphery of the central conductor, an outer conductor shielded on the outer periphery of the insulating layer, and a jacket covering the outer periphery of the outer conductor;
An FPC having flexibility, the FPCs disposed on both ends in the longitudinal direction of the plurality of micro coaxial cables;
A terminal connection portion for connecting each external conductor exposed by removing a part of the jacket in a state where the jackets of both ends of the micro coaxial cables are left, to the ground circuit of each FPC. Micro coaxial cable assembly. 2. The micro coaxial cable assembly according to claim 1, wherein the connection between each external conductor and the ground circuit in the terminal connection portion is soldering.

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