JP2010192318A - Cable harness for u-shaped slide - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cable harness for a U-shaped slide which has excellent noise resistance characteristics, excellent bending resistance, and is easy to wire. <P>SOLUTION: The cable harness for a U-shaped slide includes a plurality of electric wires 2, a flexible tube 3 which covers outer circumferences of the plurality of electric wires 2 and is not heat-shrinkable, connectors 4 mounted on terminals of the plurality of electric wires 2 exposed from ends of the flexible tube 3, and heat-shrinkable tubes 5 shrunk so as to cover parts of the flexible tube 3 and the terminals of the plurality of electric wires 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a U-sliding cable harness having excellent noise resistance characteristics, excellent bending resistance characteristics, and easy wiring.

  In recent years, with the widespread use of printers, higher speed and higher density of data transmission are required. Conventionally, FFC (Flexible flatcables) having a U-slidable structure is often used in a cable harness that transmits data between a scanner unit of a printer and a printer body.

  On the other hand, with the increase in data transmission speed, noise generation has become a problem. As an anti-noise measure, there is FFC with conductive adhesive provided with an aluminum shield, but this is not suitable for U-sliding movable parts.

  Regarding the cable harness, there is Patent Document 1 as a prior art document for noise countermeasures and Patent Document 2 as a prior art document for durability enhancement at a movable part.

Japanese Patent Laid-Open No. 7-288042 JP-A-6-36619

  Since the shield of the FFC does not structurally surround the entire 360 ° around the electric wire, it is insufficient as a countermeasure against noise accompanying the increase in data transmission speed.

  The FFC shield is generally a polyester film with a conductive adhesive, but if it is U-shaped, the shield is easy to peel off and the disconnection life is low.

  In addition, it is desirable that the cable harness arranged in a narrow space in the printer can be easily wired.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a U-sliding cable harness that solves the above-described problems, has excellent noise resistance characteristics, excellent bending resistance characteristics, and is easy to wire.

  In order to achieve the above object, the present invention provides a plurality of electric wires, a flexible tube that does not thermally contract the outer periphery of the plurality of electric wires, and the plurality of electric wires that are exposed from an end of the flexible tube. A connector attached to a terminal, and a heat-shrinkable tube contracted to cover a part of the flexible tube and the terminals of the plurality of electric wires.

  The flexible tube may be formed in a square shape having an inner diameter of a short side that is not more than twice an outer diameter of the electric wire.

  The plurality of electric wires may be attached to a film tape and arranged in a flat shape.

  The connector may have a plurality of terminals arranged at a predetermined terminal pitch, and the plurality of electric wires may be arranged at the same pitch as the terminal pitch of the connector.

  The plurality of electric wires may include one or more of a coaxial line, a four-core diagonal coaxial line for LVDS, a two-core parallel coaxial line for LVDS, an insulating wire, and an insulating wire insulated with a fluororesin.

  The flexible tube may be made of an engineering plastic with enhanced bending fatigue resistance.

  The present invention exhibits the following excellent effects.

  (1) Excellent noise resistance.

  (2) Excellent bending resistance.

  (3) Wiring is easy.

It is a top view of the cable harness for U-shaped slide which shows one Embodiment of this invention. It is sectional drawing of a coaxial line. It is sectional drawing of the 4-core diagonal coaxial line for LVDS. It is sectional drawing of the 2-core parallel coaxial line for LVDS. It is sectional drawing of an insulated wire. It is a perspective view of the flexible tube used for this invention. It is the perspective view which inserted the electric wire in the flexible tube of FIG. It is the perspective view which affixed the electric wire on the film tape. It is a conceptual diagram of a slide test.

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

  As shown in FIG. 1, a U-sliding cable harness 1 according to the present invention includes a plurality of electric wires 2, a flexible tube 3 that covers the outer periphery of the plurality of electric wires 2, and does not shrink. Connector 4 attached to the ends of the plurality of electric wires 2 exposed from the ends of the tube 3, and heat shrinkage contracted so as to cover a part of the flexible tube 3 and the ends of the plurality of electric wires 2 A tube 5.

  The plurality of electric wires 2 include a coaxial line, a LVDS four-core diagonal coaxial line (Quad-X), an LVDS two-core parallel coaxial line (Twin-ax), an insulating wire, and an insulating wire insulated with a fluororesin. Any one or more types are included.

  As shown in FIG. 2, the coaxial line 21 covers the inner conductor 22, the inner jacket 23 covering the inner conductor 22, the outer conductor (shield) 24 provided on the outer periphery of the inner jacket 23, and the outer conductor 24. And an outer jacket 25. The inner conductor 22 and the outer conductor 24 are made of a hard copper wire or a copper alloy wire having a tensile strength of 350 MPa or more so that the U-sliding cable harness 1 can ensure a U-shaped sliding life of 1 million times or more. . The outer diameter of the coaxial line 21 is desirably 0.5 mm or less. The inner conductor 22 is preferably not a single wire but seven stranded wires.

  As shown in FIG. 3, the four-core diagonal coaxial line 31 for LVDS has four internal wires in which the inner conductor 32 is covered with an insulator 33 and is arranged diagonally. 35 and an outer jacket 36 are provided in this order. The insulator used for the inner jacket 34 is preferably PFA or FEP having excellent transmission characteristics. The outer jacket 36 is formed by winding a polyester tape 3 to 9 μm thick so that the outer diameter of the electric wire 2 does not increase and the electric wire 2 is soft, or 0.2 to 0.5 mm FPA, FEP, ETFE, etc. It is desirable to form by extrusion molding of fluororesin.

  As shown in FIG. 4, in the LVDS two-core parallel coaxial line 41, two internal wires in which the inner conductor 42 is covered with an insulator 43 are arranged in parallel, and an outer conductor 44 and an outer jacket 45 are arranged on the outer periphery thereof. They are provided in order.

  As shown in FIG. 5, the insulating wire 51 includes a conductor 52 and an insulator 53 that covers the conductor 52. A fluororesin is preferably used for the insulator 53.

  As shown in FIG. 6, the flexible tube 3 is a so-called square tube whose outer shape and internal space are formed in a square shape. This is suitable when a plurality of electric wires 2 are arranged in a flat shape as shown in FIG. The flat shape means that a plurality of electric wires 2 are arranged in a line so that the plurality of electric wires 2 are parallel to each other and adjacent to each other on the same plane.

  The recommended values for the dimensions of such a rectangular flexible tube 3 are as follows. The height (short side outer diameter) h is desirably 2.5 mm or less, and the wall thickness t is desirably 1 mm or less. This is because the U-sliding cable harness 1 is arranged in a narrow space of 60 mm or less in the printer and moves the U-shaped slide in the space, so that it is as thin and soft as possible. The short side inner diameter b is preferably not more than twice the outer diameter of the electric wire 2. This is to prevent the electric wires 2 from crossing each other in the flexible tube 3. That is, by restricting the inner space to the short side inner diameter b, the electric wires 2 are restricted from overlapping in the inner space. The long side outer diameter a is desirably 30 mm or less. This is to improve the dimensional balance between the connector 4 and the flexible tube 3 while the width of the connector 4 is limited to about 30 mm even if it is large.

  The material of the flexible tube 3 is preferably a halogen-free engineering plastic or an engineering plastic with enhanced bending fatigue resistance. For example, Hytrel (registered trademark) is soft and excellent in heat resistance, impact resistance, impact resilience, and bending fatigue resistance. Thereby, the U-sliding cable harness 1 is not easily damaged even if the U-shaped sliding is repeatedly performed 1 million times or more in the scanner unit, and does not damage the electric wire 2 such as external rubbing and buckling. Can be. Further, since the hytrel is excellent in silence, the U-sliding cable harness 1 can minimize the sound during the U-sliding.

  The flexible tube 3 is made of a material that does not heat shrink. This is because the flexible tube 3 is not deformed when the heat-shrinkable tube 5 is heat-shrinked.

  As shown in FIG. 8, in order to arrange the plurality of electric wires 2 in a flat shape, it is preferable to attach the plurality of electric wires 2 to one surface of the film tape 81. As the film tape 81, there is a polyester film tape with an adhesive. By attaching the plurality of electric wires 2 to one surface of the film tape 81, it becomes easy to arrange and hold these electric wires 2 in an orderly manner. Further, by sticking the plurality of electric wires 2 to one surface of the film tape 81, when the plurality of electric wires 2 are inserted into the flexible tube 3, the electric wires 2 are prevented from being separated, and the work is facilitated.

  The connector 4 used in the U-sliding cable harness 1 of FIG. 1 has a plurality of terminals arranged at a predetermined terminal pitch. On the other hand, it is desirable that the plurality of electric wires 2 be arranged at the same pitch as the terminal pitch of the connector 4. Thereby, when attaching the connector 4 to the plurality of electric wires 2, it becomes easy to connect each terminal and each electric wire 2, and when the U-sliding cable harness 1 is slid in a U shape, each electric wire 2 is randomly selected. Is prevented from moving. When the electric wires 2 move randomly, the electric wires 2 may overlap each other. The overlapping of the electric wires 2 during the U-shaped slide is a severe condition for durability, and the disconnection life is shortened.

  The heat-shrinkable tube 5 is disposed so as to cover from the end of the flexible tube 3 to the terminals of the plurality of electric wires 2 with a margin before heat-shrinking, and then heat-shrinked.

  The U-sliding cable harness 1 of the present invention covers the outer periphery of a plurality of electric wires 2 with a flexible tube 3 that does not heat shrink, and heat shrinks from the flexible tube 3 to the end of the electric wire 2 connected to the connector 4. Since it was covered with the tube 5 and contracted, the bending resistance is excellent and wiring is easy. In particular, by using an engineering plastic with enhanced bending fatigue resistance for the flexible tube 3, the bending resistance is further improved.

  The cable harness 1 for U-shaped slide according to the present invention can be easily arranged in a flat shape by attaching a plurality of electric wires 2 to the film tape 81 and can be easily inserted into the flexible tube 3. .

  In the U-sliding cable harness 1 of the present invention, the flexible tube 3 is formed in a square shape, and the inner diameter of the short side is set to be not more than twice the outer diameter of the electric wire 2. It keeps orderly without overlapping.

  In the U-sliding cable harness 1 of the present invention, since the plurality of electric wires 2 are arranged at the same pitch as the terminal pitch of the connector 4, the electric wires 2 are held in an orderly manner.

  A U-sliding cable harness 1 of the present invention includes, as an electric wire 2, a coaxial line 21, a LVDS four-core diagonal coaxial line 31, an LVDS two-core parallel coaxial line 41, an insulating wire 51, and an insulation insulated with a fluororesin. Since the wire 51 is used, noise resistance is excellent.

  The U-sliding cable harness 1 of the present invention is not limited to a printer, but a small-sized laptop computer, mobile phone, small video camera, PDA or the like in which a liquid crystal display unit can be folded, opened, closed, twisted, and slidable with respect to the main body. In an electronic device, it can be applied for data transmission between a liquid crystal display unit and a main body.

  Next, an evaluation test of the U-sliding cable harness 1 of the present invention will be described.

  As shown in FIG. 9, in the slide test, a U-shaped folded portion 92 is formed on the sample cable 91. The operation of # 1 that linearly moves the distal end portion 93 of the sample cable 91 toward the folded portion 92 to a predetermined stroke length, and the # 2 operation that linearly moves the distal end portion 93 in the direction opposite to the folded portion 92 and returns it to the original position. The operation is one cycle, and this is repeated for a predetermined cycle. Thus, the sample cable 91 is repeatedly slid U-shaped over a predetermined length range.

  Here, the test speed was 30 cycles / minute, the slide width (bending diameter of the folded portion 92) was 50 mm, and the stroke length was 300 mm.

  In the disconnection detection method, a plurality of wires of the sample cable 91 are loop-connected, and a predetermined voltage (several V) is constantly applied. The time (number of cycles) when the value of the current flowing through the electric wire is reduced by 20% compared to the time when the slide test is started is defined as the life (the electric wire is disconnected).

  As the sample cable 91, four types of cables shown in Table 1 were prepared. That is, in Example 1, 40 coaxial wires 21 are arranged in parallel as the electric wire 2 and covered with the flexible tube 3 (square tube), and from the flexible tube 3 to the terminal of the electric wire 2 connected to the connector 4. Covered with heat-shrinkable tube 5. In the second embodiment, ten wires of the LVDS 4-core diagonal coaxial wire 41 are arranged in parallel as the electric wires 2 and covered with the flexible tube 3 (square tube), and the electric wires 2 connected to the connector 4 from the flexible tube 3. Up to the terminal was covered with a heat shrinkable tube 5. In Comparative Example 1, ten LVDS four-core diagonal coaxial wires 41 were arranged in parallel and bonded and fixed with a polyester adhesive from both sides with a 55 μm thick PET film. In Conventional Example 1 (FFC structure), 40 rectangular conductors were arranged in parallel, and a 55 μm thick PET film was adhered and fixed from both sides with a polyester adhesive.

  As shown in Table 1, in the bending resistance property evaluated by the slide test, the conventional example 1 has a life (disconnected) at 150,000 cycles, and the comparative example 1 has a life at 45,000 cycles. In contrast, Example 1 had 1 million cycles or more, and Example 2 had no disconnection even after 200,000 cycles or more, and the tube had no cracks.

1 U-slide cable harness 2 Electric wire 3 Flexible tube 4 Connector 5 Heat shrinkable tube 21 Coaxial line 31 LVDS 4-core diagonal coaxial line 41 LVDS 2-core parallel coaxial line 51 Insulated wire

Claims (6)

  A plurality of electric wires, a flexible tube that does not thermally contract the outer periphery of the plurality of electric wires, a connector attached to the ends of the plurality of electric wires exposed from an end of the flexible tube, and the flexible A U-sliding cable harness comprising a heat-shrinkable tube contracted so as to cover a part of the conductive tube and the ends of the plurality of electric wires.   2. The cable harness for U-shaped slide according to claim 1, wherein the flexible tube is formed in a square shape with an inner diameter of a short side being not more than twice an outer diameter of the electric wire.   The cable harness for U-shaped slide according to claim 1 or 2, wherein the plurality of electric wires are attached to a film tape and arranged in a flat shape.   4. The connector according to claim 1, wherein the connector has a plurality of terminals arranged at a predetermined terminal pitch, and the plurality of electric wires are arranged at the same pitch as the terminal pitch of the connector. U-slide cable harness.   The plurality of electric wires include one or more of a coaxial line, a four-core diagonal coaxial line for LVDS, a two-core parallel coaxial line for LVDS, an insulating wire, and an insulating wire insulated with a fluororesin. The cable harness for U-shaped slides according to any one of claims 1 to 4.   The cable harness for U-shaped slide according to any one of claims 1 to 5, wherein the flexible tube is made of an engineering plastic having enhanced bending fatigue resistance.

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