JP2010097851A - Small-diameter coaxial cable harness, and its connection structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-diameter coaxial cable harness in which cabinets that slide while obtaining superior waterproofness are connected with each other, and which is superior in miniaturization of a bending radius and durability against repetitive bending. <P>SOLUTION: In the small-diameter coaxial cable harness 11 in which a plurality of small-diameter coaxial cables 12 are bundled and connection is made between two sliding cabinets, the small-diameter coaxial cables 12 are made to pass through a waterproof tube 21 and bundled, at places mounted on introduction places to the cabinets 1, 2, waterproof parts 23 are watertightly mounted against the waterproof tube 21, and the waterproof tube 21 covers a small-diameter coaxial cable 12 between the waterproof parts 23 and is made to pass through a cylindrical sleeve 30 in which polymer fibers are weaved or knitted. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a thin coaxial cable harness formed by bundling a plurality of thin coaxial cables and a connection structure thereof.

In a small precision device such as a portable terminal or a small video camera, circuit boards in a casing that are slidably or pivotably connected to each other are connected by a power distribution material.
In such a precision small device, a flexible wiring board is used as a power distribution material, and a waterproof member for sealing a through hole through which the flexible wiring board is inserted is wrapped with a part of the flexible wiring board by insert molding. One that is integrally molded and has improved waterproofness by a waterproofing member is known (see, for example, Patent Document 1).

JP 2006-344813 A

By the way, the flexible wiring board has a large bending radius and has a drawback that the signal line is easily disconnected by repeated bending. For this reason, it is conceivable to use a harness in which a small-diameter coaxial cable is bundled which can reduce the bending radius and is advantageous for repeated bending. In addition, the small-diameter coaxial cable has the advantage of being able to perform stable signal transmission with excellent noise characteristics.
However, since this coaxial cable harness is a bundle of coaxial cables, the outer shape of the cross section is indefinite, and a gap is formed between the coaxial cables, so that it is difficult to waterproof the through holes of each housing. Moreover, when the bundled coaxial cables are covered for waterproofing, the covered portions do not slide well between the sliding casings and are easily caught.

  Therefore, the present invention provides a thin coaxial cable harness that can connect casings that slide while obtaining good waterproofness, and has excellent durability against repeated bending, and a connection structure thereof. The purpose is to do.

The thin coaxial cable harness of the present invention that can solve the above-mentioned problem is a thin coaxial cable harness in which a plurality of thin coaxial cables are bundled,
The small-diameter coaxial cable is passed through a waterproof tube and bundled,
The waterproof part is watertightly attached to two places of the waterproof tube,
The waterproof tube covers the thin coaxial cable between the waterproof portions, and is passed through a cylindrical sleeve woven or knitted with polymer fibers.

It is preferable that the waterproof tube and the waterproof part are watertightly attached by caulking with a metal or heat-shrinkable resin.
Or it is preferable that the said waterproof tube is attached watertight by press-fitting in the said waterproof part.

The sleeve is preferably a braided monofilament hybrid fiber made of a molten liquid crystalline polymer and a flexible polymer.
Alternatively, the sleeve is preferably a warp knitted polymer fiber.

  The connection structure of the thin coaxial cable harness of the present invention is such that the thin coaxial cable harness of the present invention is wired to two housings, and the waterproof portion is attached to the introduction portion of the thin coaxial cable harness to the housing. It is characterized by being.

  According to the thin coaxial cable harness and the connection structure thereof of the present invention, water does not penetrate from the waterproof tube into the thin coaxial cable therein. And when the small-diameter coaxial cable harness is attached to the housing, a watertight waterproof portion is provided for the waterproof tube at the location where the thin coaxial cable harness is introduced. The water does not enter the casing through the small-diameter coaxial cable harness. Therefore, the casings can be connected to each other by the thin coaxial cable harness while ensuring the waterproofness of the casings.

  Further, since the waterproof tube is passed through a cylindrical sleeve woven or knitted with polymer fibers, the harness is easily slid between two sliding housings. A sleeve made of a polymer fiber has excellent wear resistance, strength, and elastic modulus, has good bendability of the harness, and the surface of the fiber becomes rough and fluffy due to repeated friction due to sliding with the housing (so-called No fibrillation) and no tearing. Therefore, a good sliding state of the harness can be maintained for a long time.

Hereinafter, an example of an embodiment of a thin coaxial cable harness and a connection structure thereof according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, a small-diameter coaxial cable harness 11 has a bundling portion 10 in which a plurality (20 to 60) of small-diameter coaxial cables 12 are bundled. A connector 13 for connection to the substrates 1 and 42 (see FIGS. 4 and 5) in the body 1 and the second housing 2 is attached and terminated. As shown in FIGS. 2A and 2B, the first housing 1 and the second housing 2 of the mobile phone terminal 3 are connected to each other with a relatively slidable structure. 2A is a perspective view showing a state in which a slide type mobile phone terminal is extended, and FIG. 2B is a perspective view showing a state in which the slide type mobile phone terminal is closed.

  The thin coaxial cable 12 has a structure having a center conductor, an inner insulator, an outer conductor, and a jacket from the center to the outer side in a radial cross section orthogonal to the center axis. After being processed, the outer conductor, the inner insulator, and the center conductor are exposed to a predetermined length stepwise and connected to the connector 13. Further, the thin coaxial cable harness 11 may include a thin insulated cable having no external conductor in addition to the plural thin coaxial cables 12. In the drawing, the number of thin coaxial cables 12 is reduced and simplified.

  The small-diameter coaxial cable 12 referred to in the present invention is a coaxial cable thinner than the AWG 40 according to the standard of AWG (American Wire Gauge). It is desirable to use an extra fine coaxial cable thinner than the AWG44. Thereby, the thin coaxial cable harness 11 is easy to bend, and can reduce the resistance when the first housing 1 and the second housing 2 slide. Further, when the bundling portion 10 is formed by bundling a plurality of small-diameter coaxial cables 12, the diameter of the small-diameter coaxial cable harness 11 can be reduced, enabling high-density wiring in a limited wiring space. To do.

  The bundling portion 10 constituting the small-diameter coaxial cable harness 11 includes about 20 to 60 small-diameter coaxial cables 12. When the thin coaxial cable 12 is as thin as AWG 46, the width of the U-shape when the bundling portion 10 in which the thin coaxial cable 12 is bundled into a U-shape is bent within 5 to 10 mm. Can do. Although the width of the U-shape increases with an increase in the number of cores (the number of small-diameter coaxial cables 12), even if 60 narrow-diameter coaxial cables 12 of the AWG 44 are bundled, the U-shaped width can be within 12 mm.

  The thin coaxial cable harness 11 is maintained in a bundled state by passing the thin coaxial cable 12 through the waterproof tube 21, and the binding portion 10 is formed. The waterproof tube 21 is made of, for example, a soft resin such as fluororesin, polyolefin, or silicone rubber, or a porous body thereof. Both ends of the waterproof tube 21 are connected to a seal cap (cap) 22.

  The seal cap 22 is made of, for example, a hard resin such as ABS, and the small-diameter coaxial cable 12 is inserted through an insertion hole 24 formed at the center thereof. The seal cap 22 has a disk-like flange portion 25 extending radially outward, and an O-ring 26 made of silicone rubber or the like is attached to the outer peripheral portion of the flange portion 25. . The O-ring 26 itself is impermeable to water, and the seal cap 22 and the O-ring 26 constitute the waterproof part 23.

  The seal cap 22 has a cylindrical portion 27 extending from one surface side of the flange portion 25, and the cylindrical portion 27 is inserted into the waterproof tube 21. A caulking member 28 is attached to the outer periphery of the cylindrical portion 27 via a waterproof tube 21. The caulking member 28 is made of, for example, spring steel. By the caulking member 28, the waterproof tube 21 is pressed against the cylindrical portion 27 of the seal cap 22 by the urging force of the caulking member 28 from the outer peripheral side, and the seal cap 22 is attached to the waterproof tube 21 in a watertight manner. When the waterproof tube 21 is made of a material having a restoring force in the extending direction such as silicone rubber, the sealing cap 22 is made by the restoring force of the waterproof tube 21 by making the outer diameter of the cylindrical portion 27 larger than the inner diameter of the waterproof tube 21. It is effective to be able to take water-tightness.

  The waterproof tube 21 has a waterproof structure, and the waterproof tube 21 into which the small-diameter coaxial cable 12 is inserted is attached to the seal cap 22 constituting the waterproof part 23 in a watertight manner. Water does not penetrate into the coaxial cable 12. Since the waterproof tube 21 has a cylindrical shape, the outer shape thereof is constant, and the unevenness of the surface is small (can be several tens of μm or less). Therefore, there is a gap at the connection portion between the waterproof tube 21 and the waterproof portion 23. It cannot be done, and both can be connected in a watertight manner.

The thin coaxial cable harness 11 having the above structure is inserted into the first housing 1 with the connector 13 at the end thereof inserted into the cable insertion hole 5 of the first housing 1. Further, a seal cap 22 and an O-ring 26 constituting the waterproof part 23 are fitted in the recess 7 formed on the end surface of the first housing 1. The recess 7 can be circular, elliptical or rectangular in plan view.
By making the inner diameter of the inner peripheral surface 7a of the recess 7 smaller than the outer diameter of the O-ring 26 and fitting the O-ring 26 there, the O-ring 26 adheres to the inner peripheral surface 7a of the recess 7 and the seal cap 22 Thus, the space between the first housing 1 and the seal cap 22 is made watertight.

  The surface of the flange portion 25 of the seal cap 22 opposite to the cylindrical portion 27 is adhered and fixed to the first housing 1 or the second housing 2 with an adhesive 29. Thereby, in addition to the O-ring 26, waterproofness can be further improved. A resin or a double-sided adhesive tape can be used for the adhesive 29, and a waterproof adhesive is desirable. For example, when the seal cap 22 is transparent, an ultraviolet curable resin is disposed between the seal cap 22 and the first housing 1 or the second housing 2, and ultraviolet rays are irradiated from the outside of the seal cap 22 to shorten the seal cap 22. It becomes possible to obtain a watertight bond in time.

  In the second housing 2 as well, the connector 13 at the end of the small coaxial cable harness 11 is inserted through the cable insertion hole 6 of the second housing 2 in the same manner as described above. A seal cap 22 and an O-ring 26 constituting the waterproof part 23 are fitted in the recess 8 formed on the end face of the. The outer peripheral surface of the flange portion 25 of the seal cap 22 and the inner peripheral surface 8a of the recess 8 are kept watertight by the O-ring 26.

  The waterproof tube 21 is passed through a cylindrical sleeve 30, and the waterproof tube 21 is covered with the sleeve 30 except for the vicinity of the waterproof portion 23 between the waterproof portions 23. The sleeve 30 is formed into a cylindrical shape by weaving or knitting polymer fibers. Both ends of the sleeve 30 are taped to the waterproof tube 21 with an adhesive tape 31. The sleeve according to the present invention secures slipperiness between the cable harness and the surrounding members (such as a housing).

  When the sleeve 30 is formed of a woven fabric (braid), it is preferable to use a monofilament hybrid fiber made of a molten liquid crystalline polymer and a flexible polymer as the polymer fiber. This monofilament hybrid fiber is composed of a core component made of a molten liquid crystalline polymer and a sheath component containing a bendable polymer.

  The molten liquid crystalline polymer used for the core component is a polymer exhibiting molten liquid crystalline properties (melting anisotropy), that is, optical liquid crystallinity (anisotropic properties) in the molten phase, and includes aromatic diols, aromatic dicarboxylic acids, A molten liquid crystalline polyester composed of repeating structural units such as aromatic hydroxycarboxylic acid can be used. The molten liquid crystallinity can be recognized by, for example, placing a sample on a hot stage, heating and heating in a nitrogen atmosphere, and observing the transmitted light of the sample. The melting point (MP) of the preferred molten liquid crystalline polyester is 260 to 360 ° C, more preferably 270 to 350 ° C. The melting point here is the peak temperature of the main endothermic peak observed by differential scanning calorific value (DSC: for example, TA3000 manufactured by Mettler) (JIS K7121).

  Polyethylene terephthalate, modified polyethylene terephthalate, polyolefin, polycarbonate, polyarylate, polyamide, polyphenylene sulfide, polyether ester ketone, and fluororesin thermoplastic polymer may be added to the molten liquid crystalline polyester. It may also contain various additives such as inorganic substances such as titanium oxide, kaolin, silica and barium oxide, carbon black, colorants such as dyes and pigments, antioxidants, ultraviolet absorbers and light stabilizers.

  The flexible thermoplastic polymer (flexible polymer) used for the sheath component is not particularly limited, and examples thereof include polyolefin, polyamide, polyester, polyarylate, polycarbonate, polyphenylene sulfide, polyester ether ketone, and fluororesin. Particularly preferred are polyphenylene sulfide (PPS), polyethylene naphthalate and semiaromatic polyesteramide. The flexible polymer here means a polymer having no aromatic ring on the main chain and a polymer having an aromatic ring on the main chain and having 4 or more atoms on the main chain between the aromatic rings. Say.

  The sheath component is preferably composed of not only a flexible thermoplastic polymer but also a blend of a flexible thermoplastic polymer and a molten liquid crystalline polyester. In particular, the flexible thermoplastic polymer is a sea component and the molten liquid crystalline polyester is an island. It is preferable to have a sea-island structure as a component. By configuring the sheath component with a blend of melted liquid crystalline polyester and a flexible polymer (especially a sea-island structure), the strength of the sheath component can be increased and at the same time the adhesion between the sheath component and the core component can be significantly increased. .

  The sea-island structure here means a state in which several tens to several hundreds of islands exist in the sea component serving as a matrix in the fiber cross section. The number of islands can be adjusted by changing the mixing ratio of the sea component and the island component, the melt viscosity, and the like. It is obtained by chip blending the sea component and the island component, or mixing the melt of both components with a static mixer or the like. The island component ratio in the sheath component is preferably 0.25 to 0.5 in terms of strength and fibril resistance in the cross-sectional area ratio (island component / sea component + island component) of the manufactured sheath type composite fiber. . The island component ratio is obtained from a micrograph of the fiber cross section, but can also be obtained from the volume ratio of the discharge amount of the core component and the sheath component at the time of production. The diameter of the island component is preferably about 0.1 to 2 μm.

  As the molten liquid crystalline polyester of the sheath component, the same molten liquid crystalline polyester as that of the core component can be used, and these may be the same or different. Preferably, a polymer having a melting point (MP) + 80 ° C. or lower and MP-10 ° C. or higher of the flexible thermoplastic polymer of the sheath component is preferable. The sheath component may contain other polymers and various additives.

  The monofilament hybrid fiber constituting the sleeve 30 includes an eccentric core-sheath type in addition to the core-sheath type composite fiber. The core component ratio in the composite fiber is 0.25 to 0.80, preferably 0.4 to 0.7. In particular, when the sheath component is composed of a flexible thermoplastic polymer and a melted liquid crystalline polyester, the sheath component also contributes to the strength improvement. Therefore, even when the core component ratio is lowered, the strength is excellent at 15 g / d or more. A composite fiber can be obtained. If the core component ratio is too large, the core is likely to be exposed, and if it is too small, the strength may be insufficient. The core component ratio here refers to the cross-sectional area ratio (core component / (core component + sheath component)) of the composite fiber. The cross-sectional area ratio is determined from a micrograph of the fiber cross section. The fiber diameter variation rate of the obtained fiber is preferably −3.5 to + 3.5%, more preferably −3.0 to + 3.0%, and the degree of conjugation (number of guide wears) is 1200 times or more. preferable.

  Such a monofilament hybrid fiber is braided to form a sleeve 30 as shown in FIG. For example, as a braided form, 16 units of bundles 30a (portions surrounded by circles in FIG. 4) in which monofilament fibers are arranged in parallel are prepared and woven into a cylindrical shape using 16 carriers. When one bundle 30a is braided by sixteen to thirteen with sixteen carriers, the sleeve 30 is composed of approximately 100 to 200 monofilament fibers. For example, when one bundle 30a is nine, the number of monofilament fibers is 9 × 16 = 144. One monofilament fiber has a diameter of 0.02 mm to 0.10 mm, and the sleeve 30 has a thickness (tubular thickness) of 0.05 mm to 0.20 mm. When the diameter of the fiber is 0.045 mm, the thickness of the sleeve 30 is about 0.1 mm. Moreover, the diameter of the cross section in the state which made the sleeve 30 cylindrical is 3.2 mm or less. When weaving fibers, if a dummy core having an elliptical cross section is used or a plurality of dummy cores having a circular cross section are used side by side and the fibers are woven around the dummy core, a braided sleeve having an elliptical cross section is manufactured.

  On the other hand, when the sleeve 30 is formed by knitting, it is preferable to warp the fibers, and the polymer fiber used in that case is preferably polyester (for example, PET). The sleeve 30 knitted with polymer fibers is more stretchable than the woven one, and the operation of passing the small-diameter coaxial cable harness 11 through the sleeve 30 is easy. For example, a sleeve that is warp knitted from 40 μm to 70 μm in thickness and pulled in the length direction to extend from 5% to 15% can be used. The sleeve has a knitting density of 55 to 75 loops per inch in the circumferential direction and 25 to 35 loops per inch in the length direction, for example.

  The small-diameter coaxial cable harness 11 configured in this way is connected to two substrates 41 and 42 that are arranged one above the other and move horizontally in the front-rear direction (left-right direction in FIGS. 4 and 5). The substrate 41 is incorporated in the first housing 1 shown in FIG. 2, and the substrate 42 is incorporated in the second housing 2 shown in FIG. Both terminals of the small-diameter coaxial cable harness 11 are attached to the connectors 13 and terminated to facilitate connection to the substrates 41 and 42. The small-diameter coaxial cable harness 11 is connected to both the boards 41 and 42 so that the space between the waterproof parts 23 is U-shaped (or J-shaped). Thereby, the thin coaxial cable harness 11 can be wired between the substrates 41 and 42 in a U-shape in the plan view direction of the substrates 41 and 42. 4 shows a state in which both ends of the thin coaxial cable harness 11 are farthest away, and FIG. 5 shows a state in which both ends are closest. The horizontal movement distance of the substrates 41 and 42 is, for example, about 30 mm to 60 mm. 4 and 5 are repeated, the thin coaxial cable harness 11 slides and repeats the U-shaped and J-shaped states while the bent portion moves. This is repeated bending.

  The small-diameter coaxial cable harness 11 is bent in the width direction of the substrate (in the direction of the double-headed arrow W in FIG. 4A) as seen in a plan view. Since the widths of the substrates 41 and 42 are several centimeters, a sufficient bending diameter in this direction can be secured. For example, as shown in FIG. 4A, if one end of the thin coaxial cable harness 11 is connected to the right side of the upper substrate 41 in the sliding direction (upper side in FIG. 4A), The other end is connected to the left side (lower side in FIG. 4A) of the lower substrate 42 with respect to the sliding direction. The thin coaxial cable harness 11 is bent in a U shape. However, in order to reduce the space for accommodating the thin coaxial cable harness 11, it is better that the U-shaped width (interval between the straight portions) is narrower.

  When a conventional FPC (flexible printed circuit board) is used, the FPC is bent between the substrates 41 and 42 in a direction perpendicular to the planar direction of the substrates. It is necessary to increase the gap 42. In the present invention, the gap between the boards 41 and 42 is sufficient to be about the thickness of the small-diameter coaxial cable harness 11, and does not need to be large as in the case of using the FPC. it can.

  As shown in FIG. 6, the housings 1 and 2 are preferably provided with a housing portion 9 that houses the small-diameter coaxial cable harness 11 with a predetermined width. For example, as illustrated in FIG. 6A, a rectangular recess 9 a can be provided as the housing portion 9. As a result, the U-shaped deformation of the small-diameter coaxial cable harness 11 accompanying the relative sliding of the two casings 1 and 2 is performed in the housing portion 9, so that the coaxial cable 12 is connected between the casings 1 and 2. It can be prevented from being caught. Moreover, both housings 1 and 2 can slide smoothly. Alternatively, as shown in FIG. 6B, the housing 9 surrounded by walls can be formed by providing protrusions 9b on the housings 1 and 2 in a rectangular shape, for example.

  By using the thin coaxial cable 12 thinner than the AWG 44, the thin coaxial cable harness 11 can be easily bent, and the resistance when the casings 1 and 2 slide can be reduced. Moreover, the thin coaxial cable harness 11 can be formed thin, and the device can be made thin. Since the thin coaxial cable harness 11 can be flattened by being sandwiched between the casings 1 and 2, the thickness of the accommodating portion 9 is slightly smaller (about 0.2 mm) than the thickness of the thin coaxial cable harness 11. May be. As described above, the small-diameter coaxial cable harness 11 may include a small-diameter insulated cable without an outer conductor, but the thin-diameter insulated cable uses a cable whose outer diameter is thinner than 0.30 mm. preferable.

  The small-diameter coaxial cable harness 11 has a waterproof tube 21 that covers the small-diameter coaxial cable 12 bundled between the waterproof portions 23 as described above, and is inserted into the sleeve 30. The sleeve is formed by weaving or knitting polymer fibers. No. 30 is excellent in wear resistance, strength, and elastic modulus. Therefore, the small-diameter coaxial cable harness 11 using this has good bendability, is easy to slide with respect to the casings 1 and 2, and the sleeve 30 is not broken by repeated friction with the casings 1 and 2. If the sleeve 30 is a braided monofilament hybrid fiber made of a molten liquid crystalline polymer and a flexible polymer, the surface of the sleeve 30 is not roughened and fuzzed by repeated friction with the casings 1 and 2, and further prevents tearing. it can. Therefore, even if the thin coaxial cable harness 11 is repeatedly bent while sliding with respect to the casings 1 and 2 as the casings 1 and 2 slide, the waterproof tube 21 is prevented from being worn and the waterproof performance is maintained. It is possible to maintain the bundled state of the plurality of small-diameter coaxial cables 12 for a long period of time and to prevent the central conductor of the small-diameter coaxial cable 12 from breaking. The positions of both ends of the sleeve 30 may be determined so that the sleeve 30 covers at least a portion where the waterproof tube 21 is displaced between the waterproof portions 23.

  For example, 40 AWG 44 thin coaxial cables 12 are passed through a silicone waterproof tube 21 (inner diameter 2.4 mm, outer diameter 2.8 mm), and a monofilament hybrid made of a molten liquid crystalline polymer and a flexible polymer. A fiber braided sleeve 30 (diameter: 2.8 mm + 0.2 × 2 = 3.2 mm) is inserted into a groove having a width (length in the W direction in FIG. 4A) of 20 mm and a depth of 3 mm. Even if it is bent and slid 200,000 times by fixing one end side of the harness and moving the other end side in the length direction of the groove, the small-diameter coaxial is accommodated in a letter shape (see FIG. 6A) The central conductor of the cable 12 is not broken. Since the depth of the groove is smaller than the outer diameter of the sleeve 30, the sleeve 30 and the waterproof tube 21 are pushed and flattened. The harness is always in contact with the lower surface and the upper surface (upper housing) of the groove and is rubbed by sliding of the harness, and the rubbed portion is covered with the sleeve 30 at that time. When not covered with the sleeve, the frictional force between the waterproof tube 21 made of silicone and the upper and lower surfaces of the groove is large and cannot be slid well.

  Furthermore, even if the harness subjected to this sliding test is connected with a waterproof structure between two housings as shown in FIG. 1 and submerged in a 1 m water tank for 30 minutes, the waterproof tube 21 does not break, Does not happen.

  In order to manufacture the small-diameter coaxial cable harness 11 having the waterproof structure having the waterproof portion 23 as described above, first, the harness in which the connectors 13 are connected to both ends of the plurality of small-diameter coaxial cables 12 is connected to the waterproof tube 21. To be inserted. Further, the waterproof tube 21 is inserted through the sleeve 30. In order to prevent the fibers from coming apart, the ends of the sleeve 30 are integrated with each other by heat-sealing, and fixed to a predetermined position of the waterproof tube 21 with an adhesive tape or the like.

  Thereafter, the seal cap 22 is inserted into the small-diameter coaxial cable harness 11 from both ends, and the seal cap 22 and the waterproof tube 21 are caulked with a caulking member 28 to be connected. Further, an O-ring 26 is attached to the outer periphery of the flange portion 25 of the seal cap 22 to constitute the waterproof portion 23.

  When the connector 13 is first attached to the end of the small-diameter coaxial cable 12 and the connector 13 is passed through the waterproof tube 21 and the seal cap 22 as described above, the inner diameter of the waterproof tube 21 and the seal cap 22 is inserted through the connector 13. The size can be adjusted. When it is difficult to insert the connector 13 into the waterproof tube 21 or the seal cap 22, the small-diameter coaxial cable 12 is inserted into the waterproof tube 21 or the seal cap 22, and then the connector 13 is inserted into the end of the small-diameter coaxial cable 12. It only has to be attached. In this case, a connector may be attached after the small-diameter coaxial cable 12 is passed through the sleeve 30.

  The small-diameter coaxial cable harness 11 to which the waterproof part 23 is attached is attached to the first housing 1 and the second housing 2 constituting the mobile phone terminal 3 as follows. The connector 13 is inserted into the insertion hole 5 or 6 of the first casing 1 or the second casing 2 and is inserted into the casing. A seal cap 22 having an O-ring 26 attached to the outer periphery of the flange 25 is fitted into the recess 7 of the first casing 1 or the recess 8 of the second casing. Both are watertight by an O-ring 26.

Since the bundling portion 10 and the waterproof portion 23 have a waterproof structure, and the waterproof portion 23 is attached to the first housing 1 and the second housing 2 in a watertight manner, the first housing 1 and the second housing 2 During this period, water does not enter the first housing 1 or the second housing 2 through the thin coaxial cable harness, and the thin coaxial cable harness 11 of this embodiment exhibits a waterproof function. Further, the waterproof tube 21 covering the binding part 10 is covered with a sleeve 30 made of polymer fiber.
As a result, the bending radius can be reduced and the sliding resistance can be reduced while obtaining a good waterproof property, so that the first casing 1 and the second casing can be formed by the thin coaxial cable harness 11 that is advantageous for repeated bending. The bodies 2 can be easily connected to each other. Moreover, since the thin coaxial cable 12 has good shielding properties and excellent noise characteristics, stable signal transmission can be performed.

  In the above embodiment, the end portion of the waterproof tube 21 is fastened and connected to the cylindrical portion 27 of the seal cap 22 by the metal caulking member 28. However, the caulking member 28 is made of a heat-shrinkable resin (for example, polyolefin). The end portion of the waterproof tube 21 and the cylindrical portion 27 of the seal cap 22 may be connected in a watertight manner by forming and caulking the caulking member 28. Further, the end portion of the waterproof tube 21 and the cylindrical portion 27 of the seal cap 22 may be connected in a watertight manner by being bound by a caulking member 28 made of a band.

  Alternatively, the end portion of the waterproof tube 21 may be press-fitted into the cylindrical portion 27 of the seal cap 22, and the waterproof tube 21 may be brought into close contact with the inner periphery of the seal cap 22 to connect the seal cap 22 and the waterproof tube 21 in a watertight manner. . In the case where the waterproof tube 21 is made of a material having a restoring force from the extending direction such as silicone rubber, it is effective that water tightness can be obtained by the restoring force of the tube 21.

The waterproof tube 21 itself is formed from a heat-shrinkable resin (for example, polyolefin), and after the cylindrical portion 27 of the seal cap 22 is fitted to both ends of the waterproof tube 21, at least both ends of the waterproof tube 21 are heat-shrinked. The end portion of the waterproof tube 21 and the cylindrical portion 27 of the seal cap 22 may be connected in a watertight manner.
Further, in the small-diameter coaxial cable harness 11, the bundling portion 10 may be bundled by, for example, a braided sleeve in which monofilament fibers are knitted into a cylindrical shape, or bundled tape or yarn may be wound spirally and bundled. Then, smooth insertion of the waterproof tube 21 can be achieved.

Further, as the thin coaxial cable harness 11, a connector 13 may be retrofitted. That is, the thin coaxial cable harness 11 before the connector 13 is attached may be passed through the waterproof tube 21 and the seal cap 22, and then the connector 13 may be attached to both ends.
The present invention can also be applied to the case where the small-diameter coaxial cable 12 of the small-diameter coaxial cable harness 11 is connected to the circuit board directly or via an FPC without mounting the connector 13. Inserting the end of the small-diameter coaxial cable harness 11 into the housing through the insertion hole of the housing is the same as described above.

  Note that the adhesive 29 is not necessarily provided, and even in this case, the seal cap 22 and the first casing 1 and the second casing 2 can be sealed by the O-ring 26.

It is sectional drawing which shows the example of embodiment which concerns on the small diameter coaxial cable harness of this invention. (A) is a perspective view which shows the state which extended | stretched the mobile telephone terminal using the small diameter coaxial cable harness which concerns on this invention. (B) is a perspective view showing a state in which mobile phone terminals are stacked. It is a top view which expands and shows a part of sleeve shown in FIG. (A) is a top view which shows the example of embodiment which concerns on the small diameter coaxial cable harness of this invention, (B) is the side view. (A) is a top view which shows the state which accumulated the upper and lower board | substrates, (B) is the side view. (A), (B) is a perspective view which shows the example of an accommodating part.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... 1st housing | casing, 2 ... 2nd housing | casing, 3 ... Mobile telephone terminal, 10 ... Bundling part, 11 ... Thin diameter coaxial cable harness, 12 ... Thin diameter coaxial cable, 13 ... Connector, 21 ... Waterproof tube, 22 ... seal cap, 23 ... waterproof part, 30 ... sleeve.

Claims (6)

A thin coaxial cable harness in which a plurality of thin coaxial cables are bundled,
The small-diameter coaxial cable is passed through a waterproof tube and bundled,
The waterproof part is watertightly attached to two places of the waterproof tube,
The small-diameter coaxial cable harness, wherein the waterproof tube covers the small-diameter coaxial cable between the waterproof portions and is passed through a cylindrical sleeve woven or knitted with polymer fiber. The thin coaxial cable harness according to claim 1,
The small-diameter coaxial cable harness, wherein the waterproof tube and the waterproof part are watertightly attached by caulking with a metal or heat-shrinkable resin. The thin coaxial cable harness according to claim 1,
A thin coaxial cable harness, wherein the waterproof tube is watertightly attached by being press-fitted into the waterproof part. A thin coaxial cable harness according to any one of claims 1 to 3,
A thin coaxial cable harness, wherein the sleeve is a braided monofilament hybrid fiber made of a molten liquid crystalline polymer and a flexible polymer. A thin coaxial cable harness according to any one of claims 1 to 3,
A thin coaxial cable harness, wherein the sleeve is a warp knitted polymer fiber. The thin coaxial cable harness according to any one of claims 1 to 5 is wired in two housings,
The connection structure for a thin coaxial cable harness, wherein the waterproof portion is attached to a location where the thin coaxial cable harness is introduced into the housing.

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