JP2013026181A - Small-diameter cable harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-diameter cable harness capable of reducing the thickness while restraining damage due to twist.SOLUTION: A small-diameter cable harness includes: a plurality of small-diameter cables 12 that are divided into bundle parts 10; a plurality of waterproof tubes 21 into which the respective bundle parts 10 grouping the small-diameter cables 12 are inserted; a pair of waterproof caps 14 to which both ends of the waterproof tubes 21 are connected; and an integral part 31 in which intermediate parts of the plurality of waterproof tubes 21 are integrated with each other.

Description

  The present invention relates to a thin cable harness in which a plurality of thin cables are bundled.

  In a small precision device such as a portable terminal or a small video camera, circuit boards in a casing that are slidably or rotatably connected to each other are connected by a wiring material. As an example of the wiring structure of a precision small device, two casings, a hinge structure connecting the two casings, a waterproof tube routed inside the hinge structure, and the end of the waterproof tube passed through the waterproof tube An electrical signal cable that extends from the inside of the housing and is routed from the inside of the housing to the inside of the other housing, and a seal that is wound around the electrical signal cable and attached to the end of the waterproof tube In addition, an apparatus including an elastic material wound around a seal is known (see, for example, Patent Document 1).

JP 2008-263285 A

  In recent years, electronic devices have been further reduced in size and thickness, and the accommodation space for cable harnesses has become thinner and narrower. For this reason, in the cable harness in which the intermediate portions are bundled in one round, it may be difficult to wire the bundled intermediate portions in a thin and narrow accommodation space.

  In this case, by dividing the parts other than the terminal part into a plurality of groups and inserting them into the waterproof tube to reduce the thickness, wiring to a thin and narrow accommodation space becomes possible. However, in an electronic device equipped with a rotating casing in which one casing rotates with respect to the other casing and the other casing rotates in a plane, the cable is connected at the connection point between the casings. There is a risk that the harness will be twisted, and the waterproof tube and the small-diameter cable inside thereof may be damaged.

  An object of the present invention is to provide a thin cable harness that can be reduced in thickness while preventing damage due to twisting.

The thin cable harness of the present invention capable of solving the above problems is a plurality of thin cables divided into a bundle of a plurality of groups, and a plurality of waterproof cables through which the thin cables of the bundles of each group are inserted. A tube and a pair of waterproof caps connected to both ends of the waterproof tube;
The intermediate portion of the plurality of waterproof tubes has an integral part integrated with each other.

  In the thin cable harness of the present invention, it is preferable that at least one of the plurality of waterproof tubes is longer than the other waterproof tubes.

  According to the present invention, since a plurality of small-diameter cables are divided into a plurality of groups of bundles and inserted through the waterproof tube, wiring to a thin and narrow housing space is possible, and it is easy to make a thin device. Can be wired. In addition, for example, when wiring between a plurality of casings that rotate or slide relative to each other, an integrated part that is integrated with each other at the intermediate portion of the plurality of waterproof tubes is arranged at a connection location between the casings. By wiring, it is possible to suppress torsion at the connection point between the casings. Accordingly, it is possible to prevent damage to the waterproof tube and the thin cable inside thereof.

It is a front view of the mobile phone connected with the thin cable harness of the present invention, (a) is a state where the casings of the mobile phone are closed, (b) is a state where the casings of the mobile phone are opened, c) is a state in which the rotating casing of the mobile phone is rotated. It is a top view which shows an example of embodiment of the thin cable harness which concerns on this invention. It is a top view which shows the other example of embodiment of the thin cable harness which concerns on this invention. It is a perspective view of the waterproof cap to which the waterproof tube was connected. It is sectional drawing of the waterproof cap to which the waterproof tube was connected. It is sectional drawing which shows the state which attached the thin cable harness to the housing | casing. It is a figure which shows the example which wired the thin cable harness in the mobile telephone provided with the rotation housing | casing, Comprising: (a) is a schematic back view before rotation of a rotation housing | casing, (b) is rotation The schematic back view in the middle of rotation of a housing | casing, (c) is a schematic back view after the rotation of a rotation housing | casing.

Hereinafter, an example of an embodiment of a thin cable harness according to the present invention will be described with reference to the drawings.
The thin cable harness according to the present embodiment is connected to a substrate in the housings 2 and 3 of a device such as the mobile phone 1 as shown in FIGS. In the example of the cellular phone 1, a display is provided in one housing 2, and a key operation unit is provided in the other housing 3. The housings 2 and 3 are opened and closed by rotating around the hinge connecting them. In some cases, the casings 2 and 3 may be opened and closed by sliding in the vertical direction.

  As shown in FIG. 1C, one housing 2 includes a housing body 2A and a rotating housing 2B that rotates in a plane with respect to the housing body 2A, and has a small diameter. One end of the cable harness is connected in the rotating housing 2B.

  As shown in FIG. 2, the thin cable harness 11 has a plurality of (in this embodiment, 40) thin cables 12, and these are divided into a plurality of groups. A plurality (four in the present embodiment) of bundle portions 10 are provided that are bundled by 10). In the terminal portions at both ends of the small-diameter cable harness 11, the thin-diameter cables 12 of the bundle portions 10 are arranged in a planar shape, and a connector 13 for connection to the wiring board in the casings 2 and 3 of the mobile phone 1 is provided. Installed and terminated.

  The length (the length of each waterproof tube 21) of each group (bundle portion 10) of the small-diameter cables 12 is determined by the wiring shape of the harness. Like the thin cable harness 11 </ b> A shown in FIG. 3, the group (waterproof tube 21) located on the outermost side when routed may be lengthened. When there are three or more groups (waterproof tube 21), each group may have a different length. For example, it is desirable that the waterproof tube 21 positioned on the outer side when bent and routed has a bending radius difference of 1 mm to 2 mm from the inner waterproof tube 21. Therefore, it is desirable that the difference in line length between adjacent waterproof tubes 21 is 3 mm or more and 6 mm or less.

  The small-diameter cable 12 is a coaxial cable having a central conductor, an inner insulator, an outer conductor, and an outer jacket from the center toward the outer side in a radial section perpendicular to the central axis. At each end of the small-diameter cable 12, a terminal process is performed, and the outer conductor, the inner insulator, and the center conductor are exposed to a predetermined length stepwise and connected to the connector 13. The thin cable harness 11 may include an insulated cable having no external conductor in addition to the plurality of coaxial cables. In the drawing, the number of the small-diameter cables 12 is reduced and simplified.

  The small-diameter cable 12 referred to in the present invention is a coaxial cable that is thinner than the AWG 40 according to the AWG (American Wire Gauge) standard, and its outer diameter is about 0.2 mm. It is desirable to use a fine coaxial cable thinner than the AWG44. Thereby, the small diameter cable harness 11 is easy to bend, and can reduce the resistance when the casings 2 and 3 rotate or slide. Further, when a plurality of small diameter cables 12 are bundled to form a plurality of bundle portions 10, the thickness of the bundle portion 10 can be reduced, and high-density wiring in a limited wiring space is possible. .

  In each bundle portion 10 of the small-diameter cable harness 11, a plurality of small-diameter cables 12 of each group are inserted into the waterproof tube 21, and are bundled to such an extent that the positional relationship between the small-diameter cables 12 of each group can change. It has been. Therefore, when the thin cable harness 11 is bent, the thin cable 12 moves smoothly in the waterproof tube 21, so that the application of tensile force, lateral pressure, etc. to each thin cable 12 is minimized.

  The waterproof tube 21 is excellent in waterproofness, has flexibility and flexibility, and is formed from a terpolymer polymer (THV) of tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride, High durability. The terpolymer polymer constituting the waterproof tube 21 has a melting point of 100 ° C. to 140 ° C., an MFR (melt flow rate of 265 ° C./5 kg) of 1.5 g / min to 2.5 g / min, glass transition. It is preferable that the point is 0 ° C. or higher and 10 ° C. or lower, the elongation is 600% or higher and 700% or lower, and the flexural modulus is 0.05 GPa or higher and 0.10 GPa or lower.

  The waterproof tube 21 has an outer diameter of 1.3 mm or less and a wall thickness of 0.1 mm or more and 0.2 mm or less. In the waterproof tube 21 of the present embodiment, the outer diameter is 1.3 mm, the inner diameter is 1.1 mm, and the wall thickness is 0.1 mm.

  The small-diameter cable harness 11 has an integrated portion 31 in which intermediate portions of a plurality of waterproof tubes 21 are integrated with each other. The integrated portion 31 is provided by winding a plurality of tubes 21 around a resin tape 32 around a length of about 20 mm to 40 mm in the longitudinal direction. As this resin tape 32, what apply | coated the adhesive agent to PET (polyethylene terephthalate) tape can be used. This integral part 31 is arranged at a hinge part connecting the casings 2 and 3.

  Thus, the integral part 31 of the thin cable harness 11 can be easily and inexpensively provided by batch processing by bundling a plurality of waterproof tubes 21 and winding the resin tape 32 thereon.

  As shown in FIGS. 4 and 5, at both end portions of each bundle portion 10, a pair of common waterproof caps 14 are connected together in a watertight manner to the end portions of the respective waterproof tubes 21. A plurality of insertion holes 16 corresponding to the plurality of waterproof tubes 21 are formed in the waterproof cap 14, and the waterproof tubes 21 are attached to the insertion holes 16. Further, the small-diameter cable 12 of each bundle portion 10 inserted through the waterproof tube 21 is also inserted through the insertion hole 16 of the waterproof cap 14.

  The waterproof cap 14 is made of an elastic resin material such as silicone rubber, and its hardness (Shore A hardness) is 50 degrees or more and 70 degrees or less. In the present embodiment, the waterproof cap 14 has a hardness of 60 degrees. When the outer diameter of the waterproof tube 21 is 1.3 mm, the inner diameter of the insertion hole 16 of the waterproof cap 14 is 0.95 to 1.05 mm (the outer diameter of the waterproof tube is 1.2 times the inner diameter of the insertion hole). 1.4 times) is preferable. For example, the waterproof tube 21 is watertightly connected to the waterproof cap 14 by press-fitting a waterproof tube 21 having an outer diameter of 1.3 mm larger than the inner diameter of 1.0 mm of the insertion hole 16.

  An adhesive (such as an ultraviolet curable type or a moisture curable type) may be applied between the insertion hole 16 of the waterproof cap 14 and the waterproof tube 21, and the waterproof cap 14 and the waterproof tube 21 may be bonded. In this way, the waterproof cap 14 and the waterproof tube 21 can be more securely connected in a watertight manner.

  The small-diameter cable harness 11 has a waterproof cap 14 connected to each end of the four bundle portions 10. On the end side from the waterproof cap 14, a plurality of small-diameter cables 12 extending from the waterproof tubes 21 of the four bundle portions 10 are exposed and arranged in parallel in a plane, and one connector 13 is connected to one end. Yes.

  The waterproof cap 14 has an oval cross-sectional outer shape, and a pair of protrusions projecting in the direction perpendicular to the axial direction of the insertion hole 16 on both ends of the outer periphery of the waterproof cap 14 when viewed in the axial direction of the insertion hole 16. The ridges 15 are continuously formed in the circumferential direction.

  In order to attach the small-diameter cable harness 11 to the casings 2 and 3 constituting the mobile phone 1 or the camera, first, before attaching the connector 13 to the small-diameter cable 12, a plurality of small-diameter cables 12 are waterproofed. The tube 21 and the waterproof cap 14 are assembled through the insertion hole 16. Then, the connector 13 is attached to the thin cable 12. In addition, a plurality of waterproof tubes 21 are bundled and a resin tape 32 is wound around to form an integral part 31.

  Next, as shown in FIG. 6, the thin cable 12 and the connector 13 exposed on the end side from the waterproof tube 21 are passed through the insertion hole 2 b of the housing 2 and the insertion hole 3 b of the housing 3, respectively. The waterproof cap 14 at the end of the bundle portion 10 is fitted into the fitting portion 2 a and the fitting portion 3 a of the housing 3.

  If it does in this way, the integral part 31 of the small diameter cable harness 11 will be arrange | positioned in the connection location of 2 A of housing | casing 2 and 3 and the connection location of 2 A of case main bodies which comprise the housing | casing 2, and the rotation housing | casing 2B. .

  The fitting portions 2a and 3a are portions surrounded by walls so that the waterproof cap 14 can be accommodated in the housings 2 and 3. The waterproof cap 14 is slightly larger than the fitting portions 2a and 3a, and the waterproof cap 14 is pushed into and fitted into the fitting portions 2a and 3a.

  The portions where the waterproof cap 14 is attached to the housings 2 and 3 are fitting portions 2 a and 3 a having an oval shape in plan view surrounded by a wall surface surrounding the waterproof cap 14. The cross sections of the fitting portions 2a and 3a are slightly smaller than the cross section of the waterproof cap 14, and the waterproof cap 14 is press-fitted into the fitting portions 2a and 3a so that the thin cable harness 11 is attached to the housings 2 and 3. FIG. 6 is a cross-sectional view of a part of the casings 2 and 3 in the width direction, and only one of the plurality of bundle portions 10 is shown. The bundle portion 10 exists.

  The protrusion 15 of the waterproof cap 14 is crushed by being pressed against the fitting portions 2a and 3a of the housings 2 and 3 when the waterproof cap 14 is attached. This crushing escapes to the recessed portion between the ridges 15. The ridge 15 is always in close contact with the walls of the fitting portions 2a and 3a by a repulsive force (elastic force). Thereby, the waterproof cap 14 and the housing | casing 2 and 3 are reliably watertightly connected. Since the protrusion 15 is integrally formed with the waterproof cap 14, the cost can be reduced as compared with the case where an O-ring is separately used.

  Since the waterproof cap 14 and the waterproof tube 21 are connected in a watertight manner, the waterproof cap 14 is attached to the casings 2 and 3 in a watertight manner as described above. Water does not enter the body 2 or the housing 3 (connector 13 side).

  As described above, the mobile phone 1 to which the thin cable harness 11 of this embodiment is wired is connected to a substrate in the housings 2 and 3 that are relatively rotated and opened and closed. 2 includes a housing body 2A and a rotating housing 2B that rotates in a plane with respect to the housing body 2A.

  In this cellular phone 1, the rotating housing 2B is rotated from the state shown in FIG. 7A, and further rotated through the state shown in FIG. 7B, and the state shown in FIG. Become. As a result, the rotating housing 2B is rotated 90 degrees with respect to the housing body 2A. When a thin cable harness 11 in which a bundle portion 10 of a plurality of thin cables 12 divided into a bundle of a plurality of groups is passed through a plurality of waterproof tubes 21 is wired to such a cellular phone 1, Twisting is performed at a connection point between the housing 3 and a connection point between the housing body 2A and the rotating housing 2B.

  The thin cable harness 11 according to the present embodiment is an integrated part in which the bundle portion 10 is integrated and integrated at a connection portion between the housing 2 and the housing 3 and a connection portion between the housing body 2A and the rotating housing 2B. Since 31 is arrange | positioned, the twist of bundle parts 10 is suppressed.

  As described above, according to the thin cable harness 11 according to the present embodiment, a plurality of the thin cables 12 are divided into a plurality of groups of bundle portions 10 and inserted into the waterproof tubes 21, respectively. Wiring to a space is possible, and wiring to a thinned device can be easily performed. In addition, when wiring between a plurality of casings 2 and 3, a connecting portion between the casings 2 and 3, in which the integrated portion 31 that is integrated with each other at an intermediate portion of the plurality of waterproof tubes 21 rotates or slides relative to each other. If the wiring is arranged so as to be arranged at the connecting portion between the housing body 2A and the rotating housing 2B that rotate with respect to each other, twisting at these connecting portions can be suppressed, and the waterproof tube 21 and the thin inside thereof can be suppressed. Damage to the diameter cable 12 can be prevented. Since this structure has a multi-bundle structure in which a plurality of waterproof tubes 21 are provided, the twist of the bundle is not directly transmitted, but the waterproof tubes 21 are twisted in a spiral shape to spread the load. For example, even if the casings 2 and 3 are rotated and the rotating casing 2B is rotated about 100,000 times with respect to the casing main body 2A, damage to the waterproof tube 21 and the internal small-diameter cable 12 can be prevented. . On the other hand, when one thick waterproof tube was twisted, the waterproof tube broke after less than 60,000 times.

  Further, the small-diameter cable harness 11 can be easily connected to the wiring boards in the housings 2 and 3 by the connectors 13 at both ends. Moreover, since the thin cable 12 has good shielding properties and excellent noise characteristics, stable signal transmission can be performed.

  The present embodiment is also applicable to the case where the thin cable 12 of the thin cable harness 11 is connected to the wiring board directly or via FPC (Flexible Printed Circuits) without attaching the connector 13. .

  When directly attaching the thin cable 12 to the wiring board, the end of the thin cable 12 arranged in parallel is temporarily fixed to the wiring board with a film or the like, and the central conductor of the terminal of the thin cable 12 is connected to the wiring board. The connection terminals may be connected by soldering. Further, the outer conductor exposed at the terminal portion is connected to the ground bar. In this way, the outer conductors of the thin cable 12 can be easily grounded together by the ground bar, and a good shielding effect can be obtained. Moreover, the arrangement pitch of each small-diameter cable 12 can be fixed satisfactorily.

  In addition, in the said embodiment, although the integrated part 31 was provided in one place of the longitudinal direction, you may provide the several integrated part 31 arrange | positioned at each connection location of housing | casings. Also in this case, one integral part 31 is arranged in a portion through which the hinge passes.

  Moreover, in the said embodiment, in the edge part of the small diameter cable harness 11, the several small diameter cable 12 extended from the waterproof tube 21 of the bundle part 10 of four groups was put in parallel in the planar shape, and it became one connector 13 Although connected, it may be divided into a plurality of connectors 13 for connection.

10: Bundle part (bundle), 11: Thin cable harness, 12: Thin cable, 14: Waterproof tube, 21: Waterproof cap, 31: Integrated part

Claims (2)

A plurality of small-diameter cables divided into a bundle of a plurality of groups, a plurality of waterproof tubes through which the small-diameter cables of each group of bundles are inserted, and a pair of waterproof caps to which both ends of the waterproof tube are connected With
A thin cable harness comprising an integral portion in which intermediate portions of the plurality of waterproof tubes are integrated with each other.   The thin cable harness according to claim 1, wherein at least one of the plurality of waterproof tubes is longer than the other waterproof tubes.

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