WO2009107480A1

WO2009107480A1 - Thin coaxial cable harness and connection structure for the same

Info

Publication number: WO2009107480A1
Application number: PCT/JP2009/052190
Authority: WO
Inventors: 信之山崎; 信男白井; 健輝石元; 増田　泰人
Original assignee: 住友電気工業株式会社
Priority date: 2008-02-29
Filing date: 2009-02-10
Publication date: 2009-09-03
Also published as: CN101681694A; TWI398064B; CN101681694B; KR101096929B1; TW200941874A; KR20100007960A

Abstract

Disclosed are a thin coaxial cable harness which is waterproof and connects circuit boards movably coupled inside a case with one another, and a connection structure for the same. The thin coaxial cable harness includes a bundled part that bundles a plurality of thin coaxial cables, and waterproof parts that are installed at two locations of the bundled part in a watertight manner and installed in the case in a watertight manner. The bundled part may include a waterproof tube or waterproof tape. In either case, it is desirable that the bundled part pass through a cylindrical sleeve made of woven or knitted synthetic fiber. The connection structure of the thin coaxial cable harness is characterized by having a thin coaxial cable harness stipulated in one of claims 1 to 13 wired between the two cases, and having waterproof parts installed on the thin coaxial cable at areas where it enters the case.

Description

Thin coaxial cable harness and its connection structure

The present invention relates to a harness in which a plurality of thin coaxial cables are bundled and a connection structure thereof.

In precision small devices such as mobile phone terminals, small video cameras, and notebook computers, circuit boards in a casing that are slidably or pivotably connected to each other are connected by a wiring material. Japanese Patent Laid-Open No. 2006-344813 describes a precision small device in which a flexible wiring board in which a waterproofing member is insert-molded is used as a wiring material, and a through hole of a housing through which the wiring board is inserted is sealed with a waterproofing member. Yes.

By the way, the flexible wiring board has a drawback that it is difficult to reduce the bending radius, and the signal line is easily disconnected by repeated bending. On the other hand, a harness in which coaxial cables are bundled can reduce the bending radius and is resistant to repeated bending. In addition, the thin coaxial cable has excellent noise characteristics and can perform stable signal transmission. However, the coaxial cable harness has an indefinite cross-sectional shape and a gap between the coaxial cables, so that it is difficult to waterproof the casing through the through hole. 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.

JP 2006-344813 A

The present invention provides a small-diameter coaxial cable harness for connecting circuit boards in a casing that is movably connected while obtaining good waterproofness, and a connection structure thereof.

In order to solve the problem, a small-diameter coaxial cable harness that connects two housings whose positional relationship can be changed, and a water-tight connection is made to a bundling portion in which a plurality of small-diameter coaxial cables are bundled and a bundling portion. A harness is provided that includes a waterproof part that is attached and watertightly attached to the housing.

In the first aspect of the invention, the bundling portion includes a waterproof tube that covers the periphery of the plurality of small-diameter coaxial cables between the waterproof portions and is watertightly attached to the waterproof portion. In this case, it is preferable that the waterproof part is watertightly attached to the waterproof tube by caulking with metal or heat-shrinkable resin. Moreover, it is preferable that the waterproof part is watertightly attached to the waterproof tube by pressing the waterproof part into the waterproof tube.

In the second aspect of the invention, the bundling portion includes a waterproof tape that is tightly wound around the plurality of small-diameter coaxial cables. In this case, it is preferable that the waterproof part is provided with a support member that is watertightly attached to the bundling part inserted inward by caulking and supports a reaction force of elastic deformation when the waterproof part comes into close contact with the casing. Moreover, it is preferable that the waterproof tape is wound in a plurality of layers by changing the winding direction.

In both the first aspect and the second aspect of the invention, the binding portion is preferably passed through a cylindrical sleeve woven or knitted of synthetic fibers. In this case, it is preferable that the sleeve is a braided monofilament hybrid fiber made of a molten liquid crystalline polymer and a flexible polymer. Further, it is preferable that the sleeve is a warp knitted synthetic fiber. Moreover, it is preferable that a connector is attached to at least one end of the coaxial cable harness.

In addition, the thin coaxial cable harness connection structure in which the thin coaxial cable harness of the present invention is wired between two housings and a waterproof part is attached to the introduction portion of the thin coaxial cable harness to the housing is provided. Provided.

According to the thin coaxial cable harness of the present invention, water does not permeate from the bundled portion into the thin coaxial cable therein. When the harness is attached to the housing, a water-tight waterproof portion is attached to the housing at the location where the harness is introduced, so that water enters the housing through the harness. There is nothing to do. Therefore, the casings can be connected to each other with the harness while ensuring the waterproofness of the casings.

FIG. 1 is a perspective view showing a foldable mobile phone terminal.

2A and 2B are perspective views showing a slide-type mobile phone terminal, in which FIG. 2A shows an extended state and FIG. 2B shows an overlapped state.

FIG. 3 is a conceptual diagram of an embodiment of a thin coaxial cable harness according to the present invention.

FIG. 4 is a plan view showing the first embodiment of the thin coaxial cable harness and the connection structure using the same according to the present invention in a halved state.

FIG. 5 is a plan view showing the second embodiment of the thin coaxial cable harness according to the present invention and the connection structure using the same in a state of being halved.

FIG. 6 is a plan view showing a wound state of the waterproof tape in the thin coaxial cable harness of FIG.

FIG. 7: is a top view shown in the state which halved 3rd Embodiment of the thin coaxial cable harness which concerns on this invention, and the connection structure using the same.

FIG. 8 is an enlarged plan view showing a part of a sleeve in the thin coaxial cable harness of the third embodiment of FIG.

FIGS. 9A and 9B are conceptual views showing a state where the casings connected by the small-diameter coaxial cable harness of FIG. 5 are extended. FIG. 9A is a plan view and FIG. 9B is a side view.

10A and 10B are conceptual diagrams showing a state in which the casings connected by the small-diameter coaxial cable harness of FIG. 5 are stacked, and FIG. 10A is a plan view and FIG. 10B is a side view.

FIGS. 11A and 11B are perspective views showing examples of housings connected by the thin coaxial cable harness of FIG.

Embodiments of the present invention will be described below with reference to the drawings. The drawings are for illustrative purposes and are not intended to limit the scope of the invention. In the drawings, the same reference numerals denote the same parts in order to avoid duplication of explanation. The ratio of dimensions in the drawings is not necessarily accurate.

FIG. 1 is a perspective view showing a foldable mobile phone terminal 3. 2A and 2B are perspective views showing a slide-type mobile phone terminal 3A, in which FIG. 2A shows an extended state and FIG. 2B shows an overlapped state. The thin coaxial cable harness of the present invention connects, for example, between the casing 1 and the casing 2 of the mobile phone terminal 3 or between the casing 1A and the casing 2A of the mobile phone terminal 3A.

In the mobile phone terminal 3, the ends of the first casing 1 and the second casing 2 are connected to each other by a hinge 4 so as to be rotatable. Each of the first housing 1 and the second housing 2 has

cable insertion holes

5 and 6 on the end face on the connection side, and each end of the small-diameter coaxial cable harness 11 extends from the

holes

5 and 6 to the first housing. It is introduced into the first or second housing 2. Moreover, the hinge 4 has the communication hole 4a, and the harness 11 is inserted in the communication hole 4a.

FIG. 3 is a conceptual diagram of a thin coaxial cable harness 11 according to an embodiment of the present invention. The harness 11 has a plurality (20 to 60) of small-diameter coaxial cables 12, and the middle portions of the cables 12 are bundled. In the present specification, this bundled portion is referred to as a binding portion 10. Each cable 12 has a center conductor, an inner insulator, an outer conductor, and a jacket from the center toward the outside. At the end of each cable 12, a terminal treatment is performed, and the outer conductor, the inner insulator, and the center conductor are exposed to a predetermined length step by step, and the connector 13 is attached. The connector 13 is connected to the wiring board in the first housing 1 and the second housing 2 of the mobile phone terminal 3. The harness 11 may include a small-diameter insulated cable having no external conductor in addition to the plurality of small-diameter coaxial cable cables 12.

The cable 12 referred to in the present invention is a coaxial cable thinner than the AWG 40 according to the American Wire Gauge standard. It is desirable to use a fine coaxial cable thinner than the AWG44. Thereby, the harness 11 is easy to bend and can reduce resistance when the first housing 1 and the second housing 2 rotate or slide with respect to each other. In addition, the diameter of the bundling portion 10 can be reduced, and high-density wiring is possible in a limited wiring space.

When the cable 12 has the thickness of the AWG 46, the binding portion 10 of the harness 11 can be bent into a U shape having a width of 5 mm to 10 mm. Although the U-shaped width is increased by increasing the number of cables 12, even if 60 cables 12 of the AWG 44 are bundled, the width can be within 12 mm.

(First embodiment)
FIG. 4 is a plan view of the thin coaxial cable harness 11 A according to the first embodiment of the present invention and a connection structure using the same in a halved state. The harness 11 A has a binding portion 10 in which the thin coaxial cable 12 is passed through the waterproof tube 21. A part of the tube 21 is inserted into a communication hole 4a formed in the hinge 4 of the mobile phone terminal. The tube 21 is made of, for example, a soft resin such as fluororesin, polyolefin, or silicone rubber, or a porous body thereof. Waterproof portions 23 are provided at both ends of the tube 21.

The waterproof part 23 includes a seal cap 22 and an O-ring. The seal cap 22 is formed from, for example, a hard resin such as ABS, and the 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 outward in the radial direction, and an O-ring 26 made of silicone rubber or the like is attached to the outer peripheral portion of the flange portion 25.

Further, 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 tube 21. A caulking member 28 is attached to the outside of the portion where the cylindrical portion 27 of the tube 21 is inserted. The caulking member 28 is made of spring steel, for example. The tube 21 is pressed against the cylindrical portion 27 of the seal cap 22 by the caulking member 28. Since the waterproof tube 21 has a cylindrical shape and small irregularities on the surface (can be several tens of μm or less), there is no gap between the connection portion of the tube 21 and the waterproof portion 23, and the two are connected in a watertight manner. be able to.

In the harness 11A having the above structure, the connectors 13 at both end portions are inserted into the cable insertion holes 5 of the first housing 1 and the cable insertion holes 6 of the second housing 2 and are inserted into the respective housings. Further, an O-ring 26 that constitutes the waterproof portion 23 is fitted into the

recesses

7 and 8 formed on the end surfaces of the respective casings. As a result, the O-ring 26 is brought into close contact with the inner

peripheral surfaces

7a and 8a of the

recesses

7 and 8 and the seal cap 22 to make watertight between the casings and the seal cap 22.

The surface opposite to the cylindrical portion 27 of the flange portion 25 of the seal cap 22 is adhered and fixed to each of the

casings

1 and 2 with an adhesive 29. As the adhesive 29, a resin or a double-sided adhesive tape can be used. The adhesive 29 is desirably waterproof, and in this case, the waterproof property can be further improved in addition to the O-ring 26. For example, when the seal cap 22 is transparent, an ultraviolet curable resin is disposed between the seal cap 22 and each housing 2 and the water-tight bond is obtained in a short time by irradiating ultraviolet rays from the outside of the seal cap 22. It becomes possible.

In order to manufacture the thin coaxial cable harness 11A, first, the thin coaxial cable harness 11 (FIG. 3) with the connectors 13 connected to both ends is inserted through the tube 21. Thereafter, the seal cap 22 is inserted from both ends, and the seal cap 22 and the tube 21 are caulked and connected by the caulking member 28. 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. (Here, when it is difficult to insert the connector 13 into the tube 21 or the seal cap 22, a plurality of cables 12 before the connector is attached to the tube 21 or the seal cap 22 are inserted, and then the end of the cable 12 is inserted. The connector 13 may be attached to the

The harness 11 A 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 of the first casing 1 or the insertion hole 6 of the second casing 2 and is inserted into the casing. The seal cap 22 fitted with the O-ring 26 is fitted into the recess 7 of the first housing 1 or the recess 8 of the second housing, and the seal cap 22 and each housing are connected in a watertight manner by the O-ring 26. The harness 11A can be easily connected to the wiring boards in the first housing 1 and the second housing 2 by the connectors 13 at both ends.

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 harness, and the thin coaxial cable harness 11A of the first embodiment exhibits a waterproof function. Accordingly, the first casing 1 and the second casing 2 can be connected by the harness 11 A that can reduce the bending radius and that is advantageous for repeated bending while obtaining good waterproof properties. Moreover, since the cable 12 has good shielding properties and excellent noise characteristics, stable signal transmission can be performed.

Even if the caulking member 28 is formed of a heat-shrinkable resin (for example, polyolefin) and the caulking member 28 is thermally contracted, the end portion of the tube 21 and the cylindrical portion 27 of the seal cap 22 are connected in a watertight manner. good. Further, the end portion of the 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 cylindrical portion 27 of the seal cap 22 may be press-fitted into the end portion of the tube 21, the tube 21 may be brought into close contact with the outer periphery of the seal cap 22, and the seal cap 22 and the tube 21 may be connected in a watertight manner. When the tube 21 is made of a material having a restoring force from the extending direction such as silicone rubber, the tube 21 can be made watertight with the seal cap 22 only by making the outer diameter of the cylindrical portion 27 larger than the inner diameter of the tube 21. Is effective. Further, the tube 21 itself is formed from a heat-shrinkable resin (for example, polyolefin), and the cylindrical portion 27 of the seal cap 22 is fitted to both ends of the tube 21, and then at least both ends of the tube 21 are heat-shrinked. The end portion 21 and the cylindrical portion 27 of the seal cap 22 may be connected in a watertight manner.

Further, the bundling portion 10 between the seal caps 22 is not waterproofed, and the inner peripheral side of the seal cap 22 is filled with an adhesive so that the seal cap 22 and the bundling portion 10 are integrated, and the seal cap 22 is inserted. The gap between the cables 12 in the hole 24 may be filled with an adhesive so that water does not enter the housing from the portion where the harness 11A is introduced into the housing. As the adhesive, a humidity curable resin, a thermosetting resin, or an ultraviolet curable resin can be used.

(Second embodiment)
FIG. 5 is a plan view of the thin coaxial cable harness 11B according to the second embodiment of the present invention and a connection structure using the same in a half state. The binding portion 10 of the harness 11B is formed by watertightly winding a waterproof tape 35 around a plurality of small-diameter coaxial cables 12. A part of the binding unit 10 is inserted into a communication hole 4a formed in the hinge 4 of the mobile phone terminal. The waterproof tape 35 is a tape that does not allow water to pass through, and is formed of, for example, a soft resin having water repellency such as PTFE (polytetrafluoroethylene). The waterproof tape 35 may have an adhesive layer on the inner surface to be wound.

The waterproof tape 35 is wound around the plurality of cables 12 in a state of being partially overlapped spirally. Since the waterproof tape 35 itself is water-repellent, water does not enter the waterproof tape 35 without adhering the overlapping portions. When the waterproof tape 35 is wound in one layer (single layer), the width of the overlapping portion is preferably set to about 1/2 to 3/4 of the tape width.

FIG. 6 is a plan view showing a wound state of the waterproof tape in the thin coaxial cable harness 11B. When the harness 11B is bent excessively, a shearing force is generated in a direction perpendicular to the direction in which the tapes overlap, causing a gap between the waterproof tapes 35. When the waterproof tape 35 is wound in two layers (double) or more, it is preferable to reverse the spiral direction of winding between the inner layer 35a and the outer layer 35b. Thereby, the waterproof tape of the outer layer 35b fastens the waterproof tape of the inner layer 35a to cancel the shearing force generated in the waterproof tape of the inner layer 35a. Therefore, it is possible to reduce the bending radius of the harness 11B while maintaining waterproofness. When the waterproof tape 35 is wound in two layers, the waterproof tape of the inner layer 35a does not float at the portion where the binding portion 10 is bent, and the waterproof property is further maintained. Even when the waterproof tape 35 is wound in three or more layers, the winding direction may be changed for each layer.

As shown in FIG. 5, seal rings 30 made of a soft resin having elasticity (for example, silicone rubber) are attached to the outer periphery of both end portions of the bundling portion 10. In the seal ring 30, the bundling portion 10 formed by the waterproof tape 35 is inserted into the insertion hole 34 formed in the center thereof. The inner diameter of the insertion hole 34 is smaller than the outer diameter of the binding part 10, and the binding part 10 is press-fitted into the insertion hole 34.

The seal ring 30 has a disk-like flange portion 31 extending outward in the radial direction. Provided on the inner diameter side of the flange portion 31 is a support ring 33 serving as a support member that supports a reaction force of the elastic deformation when the flange portion 31 is pressed from the radially outer side and elastically deformed. The support ring 33 is made of a metal or hard resin having higher rigidity than the seal ring 30. Further, the support ring 33 may be built in the seal ring 30 or attached to the inner periphery of the seal ring 30 as a separate member.

Further, caulking members 32 are mounted on both sides in the axial direction of the flange portion 31 on the outer periphery of the seal ring 30. As the caulking member 32, a member similar to the caulking member 28 described in the thin coaxial cable harness 11A of the first embodiment can be used. The seal ring 30, the caulking member 32, and the support ring 33 constitute the waterproof part 23 of the harness 11B.

In the harness 11B, the connectors 13 at both ends of the harness 11B are inserted into the cable insertion holes 5 of the first casing 1 and the cable insertion holes 6 of the second casing 2, respectively, and are inserted into the respective casings. Furthermore, the seal ring 30 which comprises the waterproof part 23 is fitted in the recessed

parts

7 and 8 formed in the end surface of each housing | casing, and the permeation of the water into a housing | casing is prevented.

The bundling portion 10 covered with the waterproof tape 35 has a waterproof structure, and the bundling portion 10 is attached to a seal ring 30 constituting the waterproof portion 23 in a watertight manner. The thin coaxial cable harness 11B of the second embodiment also exhibits a waterproof function in the same manner as the thin coaxial cable harness 11A of the first embodiment. As a result, the bending radius can be reduced while obtaining good waterproofness, and the first casing 1 and the second casing 2 can be easily connected by the harness 11B that is advantageous for repeated bending. Moreover, since the cable 12 has good shielding properties and excellent noise characteristics, stable signal transmission can be performed.

In the manufacturing process of the harness 11B, before applying the waterproof tape 35, the inner cable 12 is bundled by, for example, a braided sleeve in which monofilament fibers are knitted into a cylindrical shape, or bundled tape or yarn is wound in a spiral shape and bundled. If it does in this way, smoothing of winding of waterproofing tape 35 can be aimed at.

In the first embodiment and the second embodiment, the cables 12 of the small-diameter coaxial cable harnesses 11A and 11B may be connected to the circuit board directly or via an FPC or the like without attaching the connector 13. The end of the small-diameter coaxial cable harness is inserted into the housing through the insertion hole of the housing, as described above. The thin coaxial cable harnesses 11 A and 11 B can also be applied to a structure without the hinge 4.

(Third embodiment)
FIG. 7 is a plan view of a thin coaxial cable harness 11C according to a third embodiment of the present invention and a connection structure using the same in a half state. The harness 11C is obtained by adding a sleeve 40 to the thin coaxial cable harness 11A of the first embodiment. The waterproof tube 21 is passed through a cylindrical sleeve 40, and the waterproof tube 21 is covered with the sleeve 40 except for the vicinity of the waterproof portion 23 between the waterproof portions 23. (The positions of both ends of the sleeve 40 may be determined so that the sleeve 40 covers at least a portion where the waterproof tube 21 is displaced between the waterproof portions 23.) The sleeve 40 is a synthetic fiber (polymer fiber). It is formed into a cylindrical shape by weaving or knitting. Both ends of the sleeve 40 are taped to the waterproof tube 21 with an adhesive tape 43. The sleeve according to the present invention secures slipperiness between the cable harness and the surrounding members (such as a housing).

When the sleeve 40 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 molten liquid crystalline polyester is preferably 260 to 360 ° C, more preferably 270 to 350 ° C. The melting point here is the peak temperature of the main endothermic peak observed with a differential scanning calorific value (DSC: for example, TA3000 manufactured by Mettler) (JIS K 7121).

The molten liquid crystalline polyester may be added with polyethylene terephthalate, modified polyethylene terephthalate, polyolefin, polycarbonate, polyarylate, polyamide, polyphenylene sulfide, polyetheresterketone, fluororesin thermoplastic polymer. 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 is 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. .

Here, the sea-island structure means a state in which tens to 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 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. The molten liquid crystalline polyester of the sheath component is preferably a polymer having a melting point (MP) of the flexible thermoplastic polymer of the sheath component of + 80 ° C. or lower and MP−10 ° C. or higher. The sheath component may contain other polymers and various additives.

The monofilament hybrid fiber constituting the sleeve 40 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.

FIG. 8 is an enlarged plan view showing a part of a sleeve in the small-diameter coaxial cable harness according to the third embodiment. The sleeve 40 is formed by braiding such a monofilament hybrid fiber. For example, as a braided form, 16 units of bundles 40a (portions surrounded by circles in FIG. 9) in which monofilament fibers are arranged in parallel are prepared and woven into a tubular shape using 16 carriers. When one bundle 40a is braided by 16 carriers from 6 to 13, the sleeve 40 is composed of approximately 100 to 200 monofilament fibers. For example, when one bundle 40a 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 40 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 40 is about 0.1 mm. Moreover, the diameter of the cross section in the state which made the sleeve 40 cylindrical is 3.2 mm or less. When weaving fibers, using a dummy core with an elliptical cross section or using a plurality of dummy cores with a circular cross section side by side and weaving the fibers around it, a braided sleeve with an elliptical cross section is manufactured.

On the other hand, when the sleeve 40 is formed of a knitted fabric, a warp knitted fiber is preferable, and a polyester (for example, PET) is preferable as a polymer fiber used in that case. The sleeve 40 knitted with polymer fibers is more stretchable than the woven one, and the work of passing the harness 11C through the sleeve 40 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.

FIG. 9 is a conceptual diagram showing the casing connected by the thin coaxial cable harness 11C in an extended state, (A) is a plan view, and (B) is a side view. 10A and 10B are conceptual diagrams showing a state in which the casings connected by the small-diameter coaxial cable harness 11C are overlapped, where FIG. 10A is a plan view and FIG. 10B is a side view. The harness 11 C configured in this way is connected to two

boards

41 and 42 that are arranged one above the other and move horizontally in the front-rear direction (the left-right direction in FIGS. 9 and 10). The substrate 41 is incorporated in the first housing 1A (FIG. 7), and the substrate 42 is incorporated in the second housing 2A (FIG. 7).

Both terminals of the harness 11C are attached to the connector 13 and terminated to facilitate connection to the

boards

41 and 42. Then, the harness 11C is curved in the width direction of the substrate (in the direction of the double-headed arrow W in FIG. 9A) so that the space between the waterproof portions 23 is U-shaped (or J-shaped). It is connected to both

substrates

41 and 42. Thereby, the harness 11 C can be wired between the

boards

41 and 42 in a U-shape in the plan view direction of the

boards

41 and 42. The horizontal movement distance of the

substrates

41 and 42 is, for example, about 30 mm to 60 mm. When the states of FIGS. 9 and 10 are repeated, the harness 11C slides and repeats the U-shaped and J-shaped states while the bent portion moves. This is repeated bending.

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 two

boards

41 and 42 is sufficient as long as the thickness of the harness 11C, and does not need to be large as in the case of using the FPC, and the apparatus can be thinned.

FIGS. 11A and 11B are perspective views showing examples of the casings 1A and 1B connected by the thin coaxial cable harness 11C. The

housings

1A and 2A are preferably provided with a housing portion 9 for housing the harness 11C with a predetermined width. For example, as shown in FIG. 11A, a rectangular recess 9 a can be provided as the accommodating portion 9. As a result, the U-shaped deformation of the harness 11C accompanying the relative sliding of the two

casings

1A and 2A is caused to occur in the housing portion 9, thereby preventing the coaxial cable 12 from being caught between the

casings

1A and 2A. can do. Moreover, both housing | casing 1A, 2A can slide smoothly. Alternatively, as shown in FIG. 11B, the housing 9 surrounded by walls can be formed by providing protrusions 9b on the

housings

1A and 2A in a rectangular shape, for example.

By using the thin coaxial cable 12 thinner than the AWG 44, the harness 11C can be easily bent, and the resistance when the

casings

1A and 2A slide can be reduced. Moreover, the thickness of the harness 11C can be reduced, and the device can be made thinner. Since the harness 11C can be sandwiched between the

casings

1A and 2A and crushed to be flattened, the thickness of the accommodating portion 9 may be slightly smaller (about 0.2 mm) than the thickness of the harness 11C. As described above, the harness 11C may include a small-diameter insulated cable having no external conductor, but it is preferable to use a cable having an outer diameter smaller than 0.30 mm.

For example, 40 AWG 44 thick cables 12 are passed through a silicone waterproof tube 21 (inner diameter 2.4 mm, outer diameter 2.8 mm), and a monofilament hybrid fiber made of a molten liquid crystalline polymer and a flexible polymer is braided. The one passed through the sleeve 40 (diameter: 2.8 mm + 0.2 × 2 = 3.2 mm) is U-shaped in a groove having a width (length in the W direction in FIG. 9A) of 20 mm and a depth of 3 mm. The central conductor of the cable 12 is not broken even if it is housed and the one end side of the harness is fixed and the other end side is moved in the length direction of the groove and bending and sliding are repeated 200,000 times. Since the depth of the groove is smaller than the outer diameter of the sleeve 40, the sleeve 40 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 rubbed by sliding of the harness, and the rubbed portion is covered with the sleeve 40 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 the sliding test is connected with a waterproof structure between two housings as shown in FIG. 7 and submerged in a water tank having a depth of 1 m for 30 minutes, the waterproof tube 21 does not break, Does not happen.

When manufacturing the thin coaxial cable harness 11A of the first embodiment, the thin coaxial cable harness 11C of the third embodiment is inserted into the sleeve 40 together with the waterproof tube 21 before attaching the seal cap. Alternatively, when manufacturing the thin coaxial cable harness 11B of the second embodiment, the waterproof tape 35 and the sleeve 40 are inserted through the sleeve 40 before the seal cap is attached. In order to prevent the fibers from being scattered, the ends of the sleeve 40 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.

In the cable harness of the third embodiment, the waterproof tube is passed through a cylindrical sleeve woven or knitted with polymer fibers. As a result, the bending radius can be reduced while obtaining good waterproofness, and the sliding resistance is reduced. A sleeve made of a polymer fiber has excellent wear resistance, strength, and elastic modulus, has a good bendability of the harness, and the surface of the fiber becomes rough and fluffy due to repeated friction caused by 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.

The small-diameter coaxial cable harness of the present invention is suitable for connecting circuit boards in a casing that is slidably or pivotably connected to each other in precision small devices such as mobile phone terminals, small video cameras, and notebook computers. is there.

Claims

A thin coaxial cable harness that connects two housings whose positional relationship can change,
A bundling unit that bundles a plurality of small-diameter coaxial cables;
A small-diameter coaxial cable harness comprising: a waterproof portion attached to two places of the binding portion in a watertight manner and attached to the housing in a watertight manner.
In the thin coaxial cable harness according to claim 1,
The bundling portion includes a waterproof tube that covers the periphery of the plurality of small-diameter coaxial cables between the waterproof portions and is waterproofly attached to the waterproof portion.
In the thin coaxial cable harness according to claim 2,
The small-diameter coaxial cable harness, wherein the waterproof part is watertightly attached to the waterproof tube by caulking with a metal or heat-shrinkable resin.
In the thin coaxial cable harness according to claim 2,
The small-diameter coaxial cable harness, wherein the waterproof part is watertightly attached to the waterproof tube by pressing the waterproof part into the waterproof tube.
In the thin coaxial cable harness according to claim 2,
The small-diameter coaxial cable harness is characterized in that the binding portion is passed through a cylindrical sleeve woven or knitted of synthetic fibers.
In the thin coaxial cable harness according to claim 5,
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.
In the thin coaxial cable harness according to claim 5,
A thin coaxial cable harness, wherein the sleeve is a warp knitted synthetic fiber.
In the thin coaxial cable harness according to claim 1,
The small-diameter coaxial cable harness, wherein the binding portion includes a waterproof tape wound around the plurality of small-diameter coaxial cables in a watertight manner.
In the thin coaxial cable harness according to claim 8,
The waterproof part is provided with a support member that is watertightly attached to the bundling part inserted inside by caulking and supports a reaction force of elastic deformation when closely attached to the housing. Diameter coaxial cable harness.
In the thin coaxial cable harness according to claim 8,
A thin coaxial cable harness, wherein the waterproof tape is wound in a plurality of layers with different winding directions.
In the thin coaxial cable harness according to claim 8,
The small-diameter coaxial cable harness is characterized in that the binding portion is passed through a cylindrical sleeve woven or knitted of synthetic fibers.
In the thin coaxial cable harness according to claim 8,
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.
In the thin coaxial cable harness according to claim 8,
A thin coaxial cable harness, wherein the sleeve is a warp knitted synthetic fiber.
The thin coaxial cable harness according to any one of claims 1 to 13,
A small-diameter coaxial cable harness, wherein a connector is attached to at least one end of the coaxial cable harness.
The thin coaxial cable harness according to any one of claims 1 to 13 is wired between 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.