JP5204730B2 - Flat cable harness - Google Patents

Description

  The present invention relates to a flat cable harness that achieves both maintenance of a disconnection protection function and simplification of weft removal processing.

  For signal transmission that connects between the main body that has a foldable structure (openable and closable) and liquid crystal display in electronic devices such as mobile phones, laptop computers, flat-panel LCD TVs, PDAs (personal digital assistants), cameras, and printers. Conventionally, FPC (Flexible Printed Circuit Board) is used as the wiring material. Since the FPC is flexible and can withstand opening and closing and is formed of a film, the FPC is flat and suitable for being placed inside a thinned electronic device.

  However, some electronic devices in recent years have a rotating structure, a twisting method, and a sliding method, and a waterproof structure. Further, in recent years, electronic devices are rapidly being made thinner.

  As a cable harness applied to a movable part that performs these rotation, twisting, and sliding, a plurality of thinned wires are arranged in a flat shape and a weft made of polyester is used as a warp in Patent Document 1, Patent Document 2 describes a weaving weft thread in a plurality of thinned wires and bundling them into a round shape.

  FIG. 9 shows a conventional flat cable harness 91. The flat cable harness 91 is formed by arranging a plurality of electric wires 92 in a flat shape and weaving the electric wires 92 as warp yarns and polyester yarn 93 as weft yarns. Connectors 94 are attached to both ends of the flat cable harness 91.

JP 2001-101934 A JP 2005-141923 A

  Since FPC is vulnerable to simple bending with a small bending radius, it is necessary to create a large bending radius for bending. For this reason, it cannot be applied to a thin electronic device. Further, since the FPC is made of a film, it cannot be rolled and passed through the hinge, and when used in a twisted portion, the wiring circuit on the film is damaged. Further, in the twisted state, the FPC has unstable electrical characteristics, and deteriorates EMI (unwanted radiation) characteristics. Therefore, the FPC is not suitable for a movable part of an electronic device that is provided with various movable parts to achieve high functionality and multiple functions.

  When using the cable harness of patent documents 1 and 2 in a movable part, it protects that the electric equipment in which this cable harness is built, and the electric wire in a cable harness are rubbed by turning, twisting, and sliding, and an electric wire does not break. Therefore, it is necessary to make the weaving pitch of the wefts dense.

  However, in order to connect connectors to both ends of the cable harness, when removing the weft yarn from the end of the cable harness to the predetermined length and exposing the electric wire, if the weaving pitch of the weft yarn is dense, the weft yarn to be removed The amount is large and it takes time to remove the weft. If the weaving pitch of the wefts is made rough in order to reduce the labor of the weft removal process, the function of protecting the above-described electric wires from disconnection becomes insufficient.

  Then, the objective of this invention is providing the flat cable harness which solved the said subject and made the maintenance of a disconnection protection function and simplification of a weft removal process compatible.

  In order to achieve the above object, the present invention provides a flat cable harness in which a plurality of electric wires are arranged in a flat shape, and these electric wires are used as warp yarns and resin fiber yarns as weft yarns, and the resin fiber yarns are arranged in the longitudinal direction of the electric wires. A rough portion having a large weaving pitch and a dense portion having a narrow weaving pitch of the resin fiber yarns are formed.

  Any of a coaxial wire, an insulated wire, and a 4-core diagonal coaxial wire may be included in the plurality of electric wires.

  The resin fiber yarn may be subjected to metal plating.

  According to the present invention, it is possible to achieve both maintenance of the disconnection protection function and simplification of the weft removal process.

It is a top view of the flat cable harness which shows one Embodiment of this invention. It is a cross-sectional view of the flat cable harness of FIG. It is a cross-sectional view of the coaxial line used for the electric wire of the flat cable harness of this invention. It is a cross-sectional view of the insulated wire used for the electric wire of the flat cable harness of this invention. It is a cross-sectional view of the 4-core diagonal coaxial line used for the electric wire of the flat cable harness of this invention. It is a figure explaining a bending test. It is a figure explaining a twist test. It is a figure explaining a slide test. It is a top view of the conventional flat cable harness.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIGS. 1 and 2, a flat cable harness 1 according to the present invention includes a flat cable in which a plurality of electric wires 2 are arranged in a flat shape, and these electric wires 2 are used as warp yarns and resin fiber yarns 3 are used as weft yarns. In the harness 1, a rough portion 4 in which the weave pitch of the resin fiber yarn 3 is wide and a dense portion 5 in which the weave pitch of the resin fiber yarn 3 is narrow are formed in the longitudinal direction of the electric wire 2. At both terminals of the flat cable harness 1, each electric wire 2 is subjected to terminal processing and connected to the connector 6.

  For the electric wire 2, the coaxial line 31 shown in FIG. 3, the insulated wire 41 shown in FIG. 4, the four-core diagonal coaxial line 51 shown in FIG. 5, and the like can be used.

  As shown in FIG. 3, the coaxial line 31 includes an internal conductor 32 formed by twisting a plurality of conductor wires, an internal insulator 33 covering the internal conductor 32, and an external provided on the outer periphery of the internal insulator 33. It comprises a conductor (shield) 34 and an external insulator 35 that covers the external conductor 34.

  As shown in FIG. 4, the insulating wire 41 includes a conductor 42 formed by twisting a plurality of conductor strands and an insulator 43 that covers the conductor 42.

  As shown in FIG. 5, the LVDS four-core diagonal coaxial line (Quad-X) 51, which is a four-core diagonal coaxial line 51, has an inner conductor 52 formed by twisting a plurality of conductor strands as an insulator 53. 4 are arranged diagonally, and an inner jacket 55, an outer conductor 56, and an outer jacket 57 are sequentially provided on the outer periphery thereof.

  The outer diameter of the electric wire 2 is preferably 0.5 mm or less in consideration of the reduction in thickness of the electronic device and the passage of the electric wire 2 through the hinge portion.

  In the case of a general mobile phone, the number of the electric wires 2 is about 20 to 70 for the coaxial line 31 and about 5 to 18 for the four-core diagonal coaxial line 51, but the present invention does not limit the number of the electric wires 2. . Here, ten insulated wires 41 are arranged in parallel as the electric wires 2.

  As shown in FIG. 1 and FIG. 2, the resin fiber yarn 3 enters under the second electric wire 2 from the top of the first electric wire 2 in the arrangement order of the electric wire group in which the electric wires 2 are arranged in a flat shape. Each of the wires 2 crosses up and down alternately so that it comes out from the bottom of the second wire 2 to the top of the third wire 2. The resin fiber yarn 3 advances in the direction perpendicular to the electric wire 2 from the first to the tenth electric wires 2 in the arrangement order of the electric wire group, and then is folded back and advances in the longitudinal direction to a place separated by a weaving pitch in the longitudinal direction of the electric wires 2. From the 10th to the first electric wire 2 in the order of arrangement, the electric wires 2 proceed in the opposite direction, and the electric wires 2 intersect with each other so that the vertical relationship is alternated with the above vertical intersection. Thus, weaving is repeated in the longitudinal direction such that one resin fiber yarn 3 sews and fixes the electric wires 2 of the electric wire group one by one.

  In the vicinity of the connector 6 to be a non-movable part (specifically, a portion within 10 mm from the connector 6) is a rough part 4 in which the weaving pitch of the resin fiber yarn 3 is wide, and the weaving pitch Pw is 7 to 13 Book / cm. This weaving pitch Pw can keep the electric wire group flat and facilitate the weft removal process. The middle of the two terminals that are the movable part (specifically, the part exceeding 10 mm from the connector 6) is a dense part 5 in which the weaving pitch of the resin fiber yarn 3 is narrow, and the weaving pitch Pn is 14-22 / cm. This weaving pitch Pn is flexible enough to rotate, twist and slide smoothly while preventing damage caused by rubbing between the electronic device and the flat cable harness 1.

  An example of the resin fiber yarn 3 is a PET yarn that is a high tensile strength fiber yarn. The PET yarn is a multi strand in which a plurality of single wires having a diameter of 15 to 25 μm are assembled. Since the PET yarn can obtain an elongation of 20% or more, the PET yarn does not damage the electric wire 2 when the PET yarn is woven into the electric wire 2, and is excellent in heat resistance. Further, since the PET yarn is excellent in bending resistance and tensile resistance, it can withstand repeated bending and twisting of 300,000 times or more at the hinge portion of the electronic device.

  The standard of the thickness of the resin fiber yarn 3 is desirably 20 to 100 d (denier) so that the flat cable harness 1 can be passed through a narrow hinge portion of an electronic device and can withstand repeated twisting. If it is less than 20d, the breaking strength is not sufficient, and it is difficult to maintain the shape of the flat cable harness 1 after being woven into the plurality of electric wires 2. On the other hand, if it exceeds 100d, the resin fiber yarn 3 becomes too thick, the arrangement interval of the electric wires 2 becomes large, and the flexibility is hindered.

  In this embodiment, the resin fiber yarn 3 is subjected to metal plating of Cu or Ag. The resin fiber yarn 3 is loosened from the electric wire group at both ends of the flat cable harness 1 and taken out to the side of the connector 6 as a ground (ground) wire 3a.

  Next, the effect of the flat cable harness 1 of this invention is demonstrated.

  The conventional problem is that if the weaving pitch of the weft is dense, it takes time to remove the weft, and if the weaving pitch of the weft is rough, the disconnection protection function is insufficient.

  On the other hand, the flat cable harness 1 of FIG. 1 has a rough portion 4 with a large weaving pitch Pw at both terminals, and a dense portion 5 with a small weaving pitch Pn in the middle of both terminals. Therefore, the weft removal process is simplified at both terminals to which the connector 6 is attached, and the disconnection protection function is sufficiently maintained at other terminals.

  In the flat cable harness 1 of FIG. 1, since the metal plating is applied to the resin fiber yarn 3, the metal plated resin fiber yarn 3 can be used for the ground wire 3a. The ground lines 3a are respectively connected to the ground on the substrate of a part of the electronic device to which the connector 6 is connected and the other part (for example, the mobile phone body and the display unit), and the ground potentials of both parts are equal can do. The ground line 3a may be connected to the ground terminal of the connector 6 connected to the ground of the electronic device. When the electric wire 2 is the coaxial line 31 or the 4-core diagonal coaxial line 51, the metal plated resin fiber yarn 3 may be connected to an external conductor.

  In the flat cable harness 1 of FIG. 1, metal plating is applied to the resin fiber yarn 3. By connecting a ground wire 3 a made of the metal plating resin fiber yarn 3 to the ground of an electronic device, the metal plating resin fiber is obtained. The thread 3 serves as an electromagnetic shield for the electric wire 2. In particular, when the electric wire 2 is the insulated wire 41, the insulated wire 41 can obtain the same shielding effect as the coaxial line 31, and the flat cable harness 1 can be used for high-frequency signal transmission. Since the insulated wire 41 is cheaper than the coaxial line 31, the cost of the flat cable harness 1 can be reduced.

  A coaxial wire 31, an insulating wire 41, and a 4-core diagonal coaxial wire 51 may be mixed and used as the electric wire 2, and an electric wire group combining these may be configured. For example, the insulating wire 41 is used for the electric power supply electric wire 2. . Even in this case, it is preferable to weave these electric wires 2 as warp yarns and the metal-plated resin fiber yarns 3 as weft yarns, and the shielding effect can be obtained by connecting the ground wires 3a at both ends to the grounds at both parts of the electronic device.

  In this embodiment, the resin fiber yarn 3 is woven at a right angle with the electric wire 2, but the resin fiber yarn 3 may be woven in a spiral shape or a zigzag shape.

  In the present embodiment, the resin fiber yarns 3 are alternately crossed over the electric wires 2 for each one of the electric wires 2, but the resin fiber yarns 3 may cross over the electric wires 2 by jumping over one or more electric wires 2.

  In this embodiment, the metal-plated resin fiber yarn 3 is used as the weft, but a metal foil yarn obtained by winding a metal foil around the resin fiber yarn 3 may be used as the weft.

  In this embodiment, the rough portion 4 is within 10 mm from the terminal, but the lengths of the rough portion 4 and the dense portion 5 can be appropriately changed without departing from the gist of the present invention. Further, the weaving pitches Pw and Pn are not limited to the above-described ranges, and can be appropriately changed without departing from the gist of the present invention.

  In order to confirm the effect of the present invention, an example sample and a comparative example sample of the present invention were manufactured and evaluated.

-Cable harness using coaxial wire 31 The central conductor 32 is made by twisting seven silver-plated copper alloy wires with a diameter of 0.02 mm. An inner insulator 33 made of PFA and having a thickness of 0.05 mm was formed around the center conductor 32. An outer conductor 34 was formed by horizontally winding a φ0.025 mm tin-plated copper alloy wire on the outer periphery of the inner insulator 33. An outer insulator 35 made of PFA having a thickness of 0.03 mm was formed around the outer conductor 34. The outer diameter of the coaxial line 31 is φ0.27 mm.

  A comparative sample T1 was manufactured by bundling 40 coaxial wires 31 each having a length of 100 mm and winding a PTFE tape having a thickness of 55 μm with a ½ wrap.

  Resin fiber yarns 3 having a final outer diameter of 60 μm were woven into a zigzag by arranging 40 coaxial wires 31 having a length of 100 mm in parallel and twisting eight PET yarns having a diameter of 20 μm to a final outer diameter of 60 μm. At this time, an example sample S1 was manufactured with a rough portion 4 having a weaving pitch Pw = 10 / cm from both ends and a dense portion 5 having a weaving pitch Pn = 18 / cm at an intermediate 90 mm between both ends.

-Cable harness using the 4-core diagonal coaxial wire 51 The central conductor 52 is made by twisting seven silver-plated copper alloy wires having a diameter of 0.02 mm. An inner insulator 53 made of PFA with a thickness of 0.025 mm was formed around the center conductor 52 to obtain an insulating wire 54. Four insulating wires 54 are bundled and twisted together and wound with an inner jacket 55 made of PFA, and an outer conductor 56 is formed by horizontally winding a φ0.03 mm tin-plated copper alloy wire on the outer periphery of the inner jacket 55. A 0.04 mm thick outer jacket 57 made of a fluororesin was formed around the outer conductor 56. The outer diameter of the four-core diagonal coaxial line 51 is φ0.44 mm.

  A sample of comparative example T2 was manufactured by bundling 10 4-core diagonal coaxial wires 51 having a length of 100 mm and winding a PTFE tape having a thickness of 55 μm with a 1/2 wrap.

  A metal-plated resin fiber yarn in which ten 4-core diagonal coaxial wires 51 with a length of 100 mm are arranged in parallel, eight PET yarns with a diameter of 20 μm are twisted to an outer diameter of 60 μm, and further copper plating with a thickness of 1 μm is applied. (Cu plated PET yarn; metal plated high tensile fiber yarn) 3 was woven into a zigzag. At this time, an example sample S2 was manufactured with a rough portion 4 having a weaving pitch Pw = 10 / cm from both ends and a dense portion 5 having a weaving pitch Pn = 18 / cm at an intermediate 90 mm between both ends.

-Cable harness using the insulated wire 41 The central conductor 42 is formed by twisting seven silver-plated copper alloy wires having a diameter of 0.02 mm. An insulator 43 made of PFA having a thickness of 0.05 mm was formed around the center conductor 42 to obtain an insulating wire 41.

  40 insulating wires 41 having a length of 100 mm were arranged in parallel, and resin fiber yarns 3 having a final outer diameter of 60 μm were woven into a zigzag by twisting eight PET yarns having a diameter of 20 μm. At this time, an example sample S3 was manufactured with a rough portion 4 having a weaving pitch Pw = 10 / cm from both ends and a dense portion 5 having a weaving pitch Pn = 18 / cm at an intermediate 90 mm between both ends.

  Next, the mechanical property evaluation test for the cable harness will be described.

  As shown in FIG. 6, in the bending test, the sample cable 61 is sandwiched between the bending jigs 62, and a weight 63 is attached to the lower end of the sample cable 61 suspended from the bending jigs 62. Rotate the bending jig 62 to the left by 90 ° as in # 1, rotate it to the right by 90 ° as in # 2, and rotate the bending jig 62 to the right by 90 ° as in # 3. Rotate it 90 degrees left as in # 4 to restore it. As a result, the sample cable 61 is repeatedly bent by 90 ° to the left and right in a state where a predetermined tensile load is applied.

  The test speed was 30 times / minute. The bending angle was ± 90 °. The test cycle was # 1 → # 2 → # 3 → # 4. The load is 0.3 N (30 gf). The bending radius was 2 mm.

  In the disconnection detection method, a voltage of several volts is constantly applied to the sample cable 61, and the point in time when the current value is reduced by 20% compared to the time when the test is started is defined as the life (the number of bendings at which disconnection occurs).

  As shown in FIG. 7, in the twist test, the sample cable 71 is held by the fixed chuck portion 72 and the twist chuck portion 73. A portion between the fixed chuck portion 72 and the twist chuck portion 73 is a twist portion 74. The twist chuck 73 is turned 180 ° to the left as in # 1 and is turned 180 ° to the right as in # 2, and then the twist chuck 73 is turned 180 ° to the right as # 3. Turn and turn left 180 ° as in # 4. As a result, the sample cable 71 is repeatedly given a twist of 180 ° to the left and right at the twist portion 74.

  The test speed was 30 times / minute. The bending angle was ± 180 °. The test cycle was # 1 → # 2 → # 3 → # 4. The twisted part length was 10 mm.

  In the disconnection detection method, a voltage of several volts is constantly applied to the sample cable 71, and the point in time when the current value is reduced by 20% compared to the start of the test is defined as the life (the number of twists at which disconnection occurs).

  As shown in FIG. 8, in the slide test, a U-shaped folded portion 82 is formed in the sample cable 81. The tip portion 83 of the sample cable 81 is linearly moved toward the folded portion 82 as in # 1, and is linearly moved in the opposite direction to the folded portion 82 as in # 2, and is returned to its original state. Thereby, the sample cable 81 is repeatedly given a U-shaped folding over a predetermined length range.

  The test speed was 30 times / minute. The inner width of the slide was 4 mm. The test cycle was # 1 → # 2. The stroke length was 60 mm.

  In the disconnection detection method, a voltage of several volts is constantly applied to the sample cable 81, and the time when the current value is reduced by 20% compared to the start of the test is defined as the life (the number of times the slide occurs).

  As a result of conducting these evaluation tests on the example samples S1 to S3 and the comparative example samples T1 and T2, the following evaluations were obtained.

  In the bending test, Comparative Samples T1 and T2 were disconnected at 50,000 times, whereas Example Samples S1 to S3 were not disconnected even at 300,000 times or more, and the flat shape was not disturbed.

  In the twist test, the comparative samples T1 and T2 were disconnected at 100,000 times, whereas the example samples S1 to S3 were not disconnected even at 250,000 times or more, and the flat shape was not disturbed.

  In the slide test, Comparative Samples T1 and T2 were disconnected at 20,000 times, whereas Example Samples S1 to S3 were not disconnected even at 200,000 times or more, and the flat shape was not disturbed.

  From the results of the evaluation tests described above, the present invention is a flat cable harness that is excellent in electrical characteristics and mechanical characteristics used in electronic devices such as mobile phones, notebook computers, thin liquid crystal televisions, PDAs (personal digital assistants), cameras, and printers. It can be seen that 1 can be provided.

1 flat cable harness 2 electric wire 3 resin fiber yarn (metal plating resin fiber yarn)
4 Coarse part 5 Close part 6 Connector

Claims (3)

  A flat cable harness in which a plurality of electric wires are arranged in a flat shape, and these electric wires are used as warp yarns and resin fiber yarns as weft yarns. In the flat cable harness, the coarse portions and the resin fibers that have a wide weaving pitch of the resin fiber yarns in the longitudinal direction of the electric wires A flat cable harness characterized in that a dense portion with a narrow weave pitch is formed.   The flat cable harness according to claim 1, wherein any of a coaxial line, an insulated wire, and a 4-core diagonal coaxial line is included in the plurality of electric wires.   The flat cable harness according to claim 1 or 2, wherein the resin fiber yarn is subjected to metal plating.

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