KR20100007960A - Thin coaxial cable harness and connection structure for the same - Google Patents

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 CONNECTION STRUCTURE FOR THE SAME}

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

In precision small devices, such as a mobile telephone terminal, a small video camera, and a notebook computer, the circuit boards in the housing which are slidably or rotatably connected to each other are connected by the wiring material. Japanese Laid-Open Patent Publication No. 2006-344813 uses a flexible wiring board insert-molded with a waterproof member as the wiring material, and uses a through-hole of the housing into which the wiring board is inserted to the waterproof member. The precision small apparatus sealed by this is described.

By the way, it is difficult for a flexible wiring board to make a bending radius small, and the disconnection of a signal line arises easily by repeated bending. On the other hand, the harness which bundles the coaxial cable can make a bending radius small, and it is strong also in repetitive bending. In addition, the small diameter coaxial cable has excellent noise characteristics and can perform stable signal transmission. However, the coaxial cable harness is inindeterminate in cross section and has interstices between the coaxial cables, which makes it difficult to waterproof the through-holes in the housing. In addition, when the bundled coaxial cable is covered for waterproofing, the covered portion does not slip well between the slidable housings and is easily caught.

Patent Document 1: Japanese Patent Laid-Open No. 2006-344813

Disclosure of Invention

Problems to be Solved by the Invention

The present invention provides a small diameter coaxial cable harness for connecting circuit boards in a housing that is movably connected while obtaining good water resistance and a connection structure thereof.

MEANS TO SOLVE THE PROBLEM In order to solve a subject, it is a small diameter coaxial cable harness which connects between two housings in which a positional relationship can change, and attaches water tightly to the binding part which tied several small diameter coaxial cable, and to two places of the binding part. And a harness including a waterproof portion tightly attached to the housing.

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

In a 2nd aspect of this invention, a binding part contains the waterproof tape wound around the some small diameter coaxial cable. In this case, it is preferable that the waterproof part is provided with a support member which is tightly attached to the binding part inserted inward by caulking, and supports the reaction force of elastic deformation when it adheres to the housing. Moreover, it is preferable that the waterproof tape is wound by multiple layers, changing the winding direction.

In either of the first aspect and the second aspect of the invention, the binding portion is preferably encased in a tubular sleeve in which synthetic fibers are braided or braided. In this case, the sleeve is preferably braided monofilament hybrid fiber composed of a molten liquid crystalline polymer and a flexible polymer. It is also preferred that the sleeve is warp-knit (also referred to as warp knit). In addition, it is preferable that a connector is attached to at least one end of the coaxial cable harness.

In addition, a small diameter coaxial cable harness of the present invention is wired between two housings, and a connection structure of a small diameter coaxial cable harness is provided with a watertight portion attached to an introduction point into the housing in the small diameter coaxial cable harness.

Effects of the Invention

According to the small diameter coaxial cable harness of this invention, water does not penetrate from a binding part to the small diameter coaxial cable therein. When the harness is attached to the housing, water is tightly attached to the housing at the introduction point into the housing so that water does not enter the housing by riding the harness. Therefore, the housings can be connected by the harness while ensuring the waterproofness of the housing.

1 is a perspective view showing a folding portable telephone terminal;

Fig. 2 is a perspective view showing a slide-type mobile telephone terminal, in which (a) is in an extended state and (b) is in an overlapping state.

3 is a conceptual diagram of an embodiment of a small diameter coaxial cable harness according to the present invention;

4 is a plan view showing the first embodiment of the small diameter coaxial cable harness according to the present invention and the connection structure using the same in half;

5 is a plan view showing the second embodiment of the small diameter coaxial cable harness according to the present invention and the connection structure using the same in half.

6 is a plan view showing a lapping state of the waterproof tape in the small diameter coaxial cable harness of FIG. 5;

7 is a plan view showing in a state in which the third embodiment of the small-diameter coaxial cable harness according to the present invention and the connection structure using the same is divided in half;

8 is an enlarged plan view showing a part of a sleeve in the small diameter coaxial cable harness of the third embodiment in FIG. 7;

Fig. 9 is a conceptual diagram showing in a state where the housing connected by the small diameter coaxial cable harness of Fig. 5 is extended, (a) is a plan view, (b) is a side view,

FIG. 10 is a conceptual view showing in a state where the housings connected by the small diameter coaxial cable harness of FIG. 5 are stacked, (a) is a plan view, (b) is a side view,

11 (a) and 11 (b) are perspective views showing examples of housings connected by the small diameter coaxial cable harness of FIG. 5;

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

1 is a perspective view showing a folding portable telephone terminal 3. Fig. 2 is a perspective view showing the slide-type mobile phone terminal 3A, where (a) shows an extended state and (b) shows an overlapping state. The small diameter coaxial cable harness of the present invention is, for example, between the housing 1 and the housing 2 of the mobile phone terminal 3 or between the housing 1A and the housing 2A of the mobile phone terminal 3A. Connect.

In the portable telephone terminal 3, the edge parts of the 1st housing 1 and the 2nd housing 2 are connected by the hinge 4 so that rotation is possible. Each of the first housing 1 and the second housing 2 has cable insertion holes 5 and 6 in the cross section on the connection side, and from the holes 5 and 6, the small diameter coaxial cable harness 11 is formed. Each stage is introduced into the first housing 1 or the second housing 2. Moreover, the hinge 4 has the communication hole 4a, and the harness 11 is inserted in the communication hole 4a.

3 is a conceptual diagram of a small diameter coaxial cable harness 11 which is an embodiment of the present invention. The harness 11 has a plurality of (20 to 60) small diameter coaxial cables 12, and the middle portion of the cables 12 is bundled. In this specification, this bundled part is called binding part 10. Each of the cables 12 has a center conductor, an inner insulator, an outer conductor, and an outer sheath from the center outward. Terminal processing is performed at each end of the cable 12, and the external conductor, the internal insulator, and the center conductor are exposed to the 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 cellular phone terminal 3. In addition, in addition to the plurality of small diameter coaxial cable cables 12, the harness 11 may include a small diameter insulated cable without an external conductor.

The cable 12 according to the present invention is a coaxial cable thinner than AWG40 according to the American Wire Gauge standard. It is preferable to use a micro coaxial cable thinner than AWG44. Thereby, the harness 11 is easy to bend, and the resistance when the 1st housing 1 and the 2nd housing 2 rotate or slide each other can be made small. In addition, the diameter of the binding portion 10 can be made thin, enabling high density wiring in a limited wiring space.

In the case where the cable 12 has a thickness of AWG46, the binding portion 10 of the harness 11 can be bent into a U shape having a width of 5 mm to 10 mm. The width of the U is also increased by increasing the number of cables 12. However, even if 60 cables 12 of the AWG44 are bundled, the width can be within 12 mm.

(1st embodiment)

4 is a plan view in a state where the small-diameter coaxial cable harness 11A and the connection structure using the same are divided in half in the first embodiment of the present invention. The harness 11A has a binding portion 10 in which a small diameter coaxial cable 12 is placed in a waterproof tube 21. A portion of the tube 21 is inserted into the communication hole 4a formed in the hinge 4 of the mobile phone terminal. The tube 21 is formed of soft resin such as fluororesin, polyolefin, or silicone rubber, or a porous body thereof. Both ends of the tube 21 are provided with a waterproof part 23.

The waterproof part 23 consists of a sealing cap 22 and an O-ring. The sealing cap 22 is molded from hard resin, such as ABS, for example, and the cable 12 is inserted in the insertion hole 24 formed in the center. The sealing cap 22 has a disk-shaped flange portion 25 extending radially outward, and an O-ring 26 made of silicone rubber or the like is attached to the outer circumference of the flange portion 25.

Moreover, the sealing cap 22 has the cylindrical part 27 extended from one surface side of the flange part 25, and the cylindrical part 27 is inserted in the tube 21. As shown in FIG. 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 formed of spring steel, for example. The tube 21 is pressed against the cylindrical portion 27 of the sealing cap 22 by the caulking member 28. Since the waterproof tube 21 is cylindrical in shape and the surface unevenness is small (can be several tens of micrometers or less), the watertight tube 21 is sealed closely without a gap between the tube 21 and the waterproof portion 23. I can connect it.

In the harness 11A of the above structure, each of the connectors 13 at both ends is inserted into the cable insertion hole 5 of the first housing 1 and the cable insertion hole 6 of the second housing 2, and the respective housings 13A. Accepted by me. Moreover, the O-ring 26 which comprises the waterproof part 23 is fitted in the recessed parts 7 and 8 formed in the cross section of each housing | casing. As a result, the O-ring 26 is in close contact with the inner circumferential surfaces 7a and 8a of the recesses 7 and 8 and the sealing cap 22 to make watertight between the housing and the sealing cap 22.

The surface on the opposite side to the cylindrical portion 27 of the flange portion 25 of the sealing cap 22 is adhered to and fixed to each of the housings 1 and 2 by the adhesive material 29. As the adhesive material 29, a resin or a double-sided adhesive tape can be used. It is preferable that the adhesive material 29 has waterproofness, and in this case, it is possible to further improve the waterproofness in addition to the O-ring 26. For example, when the sealing cap 22 is transparent, an ultraviolet curable resin is disposed between the sealing cap 22 and each housing 2 to irradiate ultraviolet rays from the outside of the sealing cap 22 to provide a watertight bond in a short time. It is possible to obtain.

In order to manufacture the small diameter coaxial cable harness 11A, first, the small diameter coaxial cable harness 11 (FIG. 3) with the connector 13 connected to both ends is inserted into the tube 21. As shown in FIG. Thereafter, the sealing cap 22 is inserted from both ends, and the sealing cap 22 and the tube 21 are caulked with the caulking member 28 to be connected. In addition, the O-ring 26 is attached to the outer circumference of the flange portion 25 of the sealing cap 22 to form a waterproof portion 23. Here, the connector 13 is connected to the tube 21 or the sealing cap 22. Is difficult to insert, insert a plurality of cables 12 before attaching the connector to the tube 21 or the sealing cap 22, and then attach the connector 13 to the ends of the cable 12. You may do it.)

The harness 11A with the waterproof part 23 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 housing 1 or the insertion hole 6 of the second housing 2 and inserted into the housing. The sealing cap 22 with the O-ring 26 is fitted to the recess 7 of the first housing 1 or the recess 8 of the second housing, so that the sealing cap 22 and each housing are It connects watertightly by the ring 26. The harness 11A can be easily connected to the wiring board, etc. in the 1st housing 1 and the 2nd housing 2 by the connector 13 of both ends.

Since the binding portion 10 and the waterproof portion 23 are waterproof, and the waterproof portion 23 is tightly mounted to the first housing 1 and the second housing 2, the first housing 1 Water does not enter the first housing 1 or the second housing 2 by riding the harness between the second housing 2 and the small diameter coaxial cable harness 11A of the first embodiment exhibits a waterproof function. do. As a result, the bending radius can be reduced while obtaining good water resistance, and the first housing 1 and the second housing 2 can be connected by the harness 11A, which is also advantageous for repeated bending. In addition, since the cable 12 has good shielding property and excellent noise characteristic, it is possible to perform stable signal transmission.

In addition, the caulking member 28 is formed of a heat-shrinkable resin (for example, polyolefin, etc.), and the caulking member 28 is thermally contracted to tightly connect the end of the tube 21 and the cylindrical portion 27 of the sealing cap 22. You may also Moreover, you may connect watertightly the edge part of the tube 21 and the cylindrical part 27 of the sealing cap 22 by tying by the caulking member 28 which consists of a band.

Alternatively, the cylindrical portion 27 of the sealing cap 22 is press-fitted to the end of the tube 21, and the tube 21 is brought into close contact with the outer circumference of the sealing cap 22 to seal the sealing cap 22 and the tube 21. You may connect tightly. When the tube 21 is a material having a restoring force from an extension direction such as silicone rubber, the outer diameter of the cylindrical portion 27 is made larger than the inner diameter of the tube 21, and the sealing cap is prevented by the restoring force of the tube 21. Watertight with (22) can be taken and is effective. In addition, after the tube 21 itself is formed of a heat-shrinkable resin (for example, polyolefin, etc.) and the cylindrical portions 27 of the sealing cap 22 are fitted to both ends of the tube 21, at least both ends of the tube 21 are provided. May be thermally contracted to tightly connect the end of the tube 21 and the cylindrical portion 27 of the sealing cap 22.

In addition, an adhesive is filled on the inner circumferential side of the sealing cap 22 without water-sealing the binding portion 10 between the sealing cap 22 to integrate the sealing cap 22 and the binding portion 10. At the same time, the gap between the cables 12 in the insertion hole 24 of the sealing cap 22 is filled with an adhesive so that water does not enter the housing from the portion where the harness 11A is introduced into the housing. You may also Humidity-curable resin, thermosetting resin, and ultraviolet curable resin can be used for an adhesive agent.

(2nd embodiment)

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

The waterproof tape 35 is wound around the plurality of cables 12 in a spirally overlapped state. Since the waterproof tape 35 itself is water repellent, water does not penetrate inside the waterproof tape 35 without adhering the overlapped portion. When the waterproof tape 35 is wound in one layer (one layer), the width of the overlapping portion may be about 1/2 to 3/4 of the tape width.

6 is a plan view showing the wound state of the waterproof tape in the small diameter coaxial cable harness 11B. In a state where the harness 11B is excessively bent, shear force is generated in a direction perpendicular to the direction in which the tapes overlap, which causes a gap between the waterproof tapes 35. When winding the waterproof tape 35 in two or more layers (two layers), it is preferable to reverse the spiral direction of the wound in the inner layer 35a and the outer layer 35b. Thereby, the waterproof tape of the outer layer 35b tightens the waterproof tape of the inner layer 35a, and cancels the shear force which arises in the waterproof tape of the inner layer 35a. Therefore, it becomes 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 is not lifted at the part where the binding part 10 is bent, and waterproofness is further maintained. Even when winding the waterproof tape 35 in three or more layers, the winding direction may be changed for each layer.

As shown in FIG. 5, the sealing ring 30 which consists of soft resin (for example, silicone rubber) which has elasticity is attached to the outer periphery of the both ends of the binding part 10. As shown in FIG. As for the sealing ring 30, the binding part 10 formed by the waterproof tape 35 is inserted in the insertion hole 34 formed in the center. 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 sealing ring 30 has a disk-shaped flange portion 31 extending radially outward. On the inner diameter side of the flange portion 31, there is provided a support ring 33 that serves as a support member that supports the 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 formed of a metal or hard resin having higher rigidity than the sealing ring 30. In addition, the support ring 33 may be built in the sealing ring 30 or may be attached as a separate member to the inner circumference of the sealing ring 30.

Moreover, the caulking member 32 is attached to the axial direction both sides of the flange part 31 in the outer periphery of the sealing ring 30. As shown in FIG. As the caulking member 32, the same as the caulking member 28 described in the part of the small diameter coaxial cable harness 11A of the first embodiment can be used. These sealing rings 30, the caulking member 32, and the support ring 33 constitute the waterproof portion 23 of the harness 11B.

The harness 11B has a connector 13 at each end thereof inserted into a cable insertion hole 5 of the first housing 1 and a cable insertion hole 6 of the second housing 2 and received into each housing. Is brought in. In addition, the sealing rings 30 constituting the waterproof portion 23 are fitted into the recesses 7 and 8 formed in the end faces of the respective housings to prevent water from entering the housing.

The binding portion 10 covered by the waterproof tape 35 has a waterproof structure, and the binding portion 10 is tightly attached to the sealing ring 30 constituting the waterproof portion 23. The small-diameter coaxial cable harness 11B of the second embodiment also exhibits a waterproof function similar to the small-diameter coaxial cable harness 11A of the first embodiment. As a result, the bending radius can be reduced while obtaining good water resistance, and the first housing 1 and the second housing 2 can be easily connected by the harness 11B which is also advantageous for repeated bending. In addition, since the cable 12 has good shielding property and excellent noise characteristic, it is possible to perform stable signal transmission.

In the manufacturing process of the harness 11B, before performing the waterproof tape 35, the inner cable 12 is bundled by, for example, a braided sleeve in which a monofilament fiber is woven into a tubular shape, or a bundle tape or thread is It may be wound and tied in a spiral shape, and by doing in this way, the winding of the waterproof tape 35 can be made smooth.

In addition, in 1st Embodiment and 2nd Embodiment, you may connect the cable 12 of small diameter coaxial cable harness 11A, 11B directly to a circuit board or FPC etc., without attaching the connector 13. In addition, in FIG. . Inserting the end of the small diameter coaxial cable harness into the housing from the insertion hole of the housing is the same as that described above. Further, the small diameter coaxial cable harnesses 11A and 11B can be applied to a structure without the hinge 4.

(Third embodiment)

FIG. 7: is a top view in the state which divided | segmented the small diameter coaxial cable harness 11C which is 3rd Embodiment of this invention, and the connection structure using the same in half. The harness 11C adds the sleeve 40 to the small diameter coaxial cable harness 11A of the first embodiment. The waterproof tube 21 is enclosed in a cylindrical sleeve 40, and between the waterproof portions 23, the waterproof tube 21 is covered by the sleeve 40 except for the vicinity of the waterproof portion 23. (The positions of both ends of the sleeve 40 may be determined so that the sleeve 40 covers at least the portion where the waterproof tube 21 is displaced between the waterproof portion 23.) Sleeve ( 40 is formed into a cylindrical shape by weaving or knitting synthetic fibers (polymer fibers). Both ends of the sleeve 40 are fixed to the waterproof tube 21 by an adhesive tape 43. The sleeve according to the present invention ensures slipperiness between the cable harness and a member (housing or the like) around the cable harness.

When the sleeve 40 is formed of a woven fabric (braided), it is preferable to use a monofilament hybrid fiber composed of a molten liquid crystalline polymer and a flexible polymer as the polymer fiber. This monofilament hybrid fiber is comprised by the core component which consists of a molten liquid crystalline polymer, and the sheath component which contains a flexible polymer.

The molten liquid crystalline polymer used for the core component is a polymer showing molten liquid crystal (melt anisotropy), that is, optical liquid crystal (anisotropy) in the molten phase, and repeating such as aromatic diols, aromatic dicarboxylic acids, aromatic hydroxycarboxylic acids, and the like. The molten liquid crystalline polyester which consists of a structural unit can be used. Molten liquid crystallinity can be recognized, for example, by mounting a sample on a hot stage, heating the temperature in a nitrogen atmosphere, and observing the transmitted light of the sample. Melting | fusing point (MP) of preferable molten liquid crystalline polyester is 260-360 degreeC, More preferably, it is 270-350 degreeC. Melting | fusing point here is the peak temperature of the main endothermic peak observed with differential scanning calorimetry (DSC: the product made by mettler, TA3000, for example) (JIS K7121).

Polyethylene terephthalate, modified polyethylene terephthalate, polyolefin, polycarbonate, polyallylate, polyamide, polyphenylene sulfide, polyether ester ketone, and fluororesin thermoplastic polymer may be added to the molten liquid crystalline polyester. Moreover, you may contain various additives, such as inorganic substances, such as titanium oxide, kaolin, silica, and barium oxide, coloring agents, such as carbon black, dye, and pigment, antioxidant, a ultraviolet absorber, and a light stabilizer.

The flexible thermoplastic polymer (flexible polymer) used for the sheath component is not particularly limited, and examples thereof include polyolefins, polyamides, polyesters, polyallylates, polycarbonates, polyphenylene sulfides, polyester ether ketones, and fluororesins. have. Especially preferred are polyphenylene sulfides (PPS), polyethylene naphthalate and semiaromatic polyesteramides. In addition, a flexible polymer as referred to herein includes a polymer having no aromatic rings on the main chain and an aromatic ring on the main chain, and also having four or more atoms on the main chain between the aromatic rings. Says a polymer.

The sheath component is preferably composed of not only the flexible thermoplastic polymer but also a blend of the flexible thermoplastic polymer and the molten liquid crystalline polyester. Particularly, the flexible thermoplastic polymer is an ocean component and the molten liquid crystalline polyester. It is preferable to set it as a sea island structure. By constructing the sheath component with a mixture (particularly, an island-in-sea structure) composed of a molten liquid crystalline polyester and a flexible polymer, the strength of the sheath component can be increased and the adhesion between the sheath component and the core component can be significantly increased.

The island-in-the-sea structure here means a state in which tens to hundreds of islands exist in the sea component used as a matrix in a fiber cross section. The number of islands can be adjusted by changing the mixing ratio, melt viscosity and the like of the sea component and the island component. It is obtained by mixing the sea component and the island component in the chip, or by mixing the melt of both components with a static mixer or the like. The island component ratio in the sheath component is 0.25 to 0.5 in terms of strength and fibrillation resistance in the cross sectional area ratio (island component / sea component + island component) of the manufactured sheath type composite fiber. It is preferable. Although an island component ratio is calculated | required from the micrograph of a fiber cross section, it can also be calculated | required by the volume ratio of the discharge amount of the core component and the sheath component at the time of manufacture. It is preferable to make the diameter of an island about 0.1-2 micrometers.

As the molten liquid crystalline polyester of the sheath component, molten liquid crystalline polyester similar to the core component can be used, and these may be the same kind or different kinds. As for the molten liquid crystalline polyester of a sheath component, Preferably, melting | fusing point (MP) +80 degrees C or less of the flexible thermoplastic polymer of a sheath component, and the polymer of MP-10 degreeC or more are preferable. In addition, 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 composite fiber. The core component ratio in the composite fiber is 0.25 to 0.80, preferably 0.4 to 0.7. In particular, in the case where the sheath component is composed of the flexible thermoplastic polymer and the molten liquid crystalline polyester, the sheath component also contributes to the strength improvement, so that even when the core component ratio is lowered, excellent composite fibers having a strength of 15 g / d or more can be obtained. . When the core component ratio is too large, the core is easily exposed, and when too small, the strength may be insufficient in terms of strength. In addition, the core component ratio here shows the cross-sectional area ratio (core component / (core component + sheath component)) of a composite fiber. The cross-sectional area ratio is obtained from the micrograph of the fiber cross section. The linear 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 bonding (the number of guide wears) is preferably set to 1200 or more. .

It is an expanded top view which shows a part of sleeve in the small diameter coaxial cable harness of 3rd embodiment. The sleeve 40 is formed by braiding such monofilament hybrid fibers. For example, in the form of braiding, 16 units of bundles 40a (a circle enclosed in Fig. 8) in which monofilament fibers are arranged in parallel are prepared, and are knitted into a tubular shape using 16 carriers. If one bundle 40a is braided into sixteen carriers with six to thirteen, the sleeve 40 is composed of about 100 to 200 monofilament fibers. For example, when one bundle 40a is made into nine pieces, the number of monofilament fibers is 9x16 = 144 pieces. In addition, the diameter of one monofilament fiber is 0.02 mm-0.10 mm, and the thickness (cylindrical thickness) of the sleeve 40 is 0.05 mm-0.20 mm. When the diameter of the fiber is 0.045 mm, the thickness of the sleeve 40 is about 0.1 mm. In addition, the diameter of the cross section in the state which made the sleeve 40 cylindrical is 3.2 mm or less. When weaving fibers, a dummy core having an elliptic cross section is used, or a plurality of dummy cores having a cross section is used in a line, or a fiber is woven around it, whereby a braided sleeve having an elliptic cross section is produced.

On the other hand, when the sleeve 40 is formed of a braided product, it is preferable that the fiber is warp, and polyester (for example, PET) is preferable as the polymer fiber used in that case. The sleeve 40 that is made of polymer fiber is superior in elasticity to that of the woven fabric, and the work of putting the harness 11C into the sleeve 40 is easy. For example, a polyester yarn having a thickness of 40 µm to 70 µm is warped and pulled in the longitudinal direction to use a sleeve that is 5% to 15% elongated. Also, the knit density of this sleeve is, for example, 55 to 75 loops per inch in the circumferential direction and 25 to 35 loops per inch in the longitudinal direction.

Fig. 9 is a conceptual diagram showing in a state where the housing connected by the small-diameter coaxial cable harness 11C is extended, (a) is a plan view, and (b) is a side view. Fig. 10 is a conceptual diagram showing the housings connected by the small-diameter coaxial cable harness 11C in the overlapping state, where (a) is a plan view and (b) is a side view. The harness 11C comprised in this way is connected to the two board | substrates 41 and 42 which move horizontally back and front (left-right direction of FIG. 9, FIG. 10) arrange | positioned up and down. The substrate 41 is embedded in the first housing 1A (FIG. 7), and the substrate 42 is embedded in the second housing 2A (FIG. 7).

Both terminals of the harness 11C are connected to the substrates 41 and 42 by attaching the connector 13 and performing a star formation process. The harness 11C is curved in the width direction of the substrate (in the directions of both arrows W in FIG. 9 (a)) so that the watertight portions 23 are U-shaped (or J-shaped). It is connected to both board | substrates 41 and 42. Thereby, the harness 11C can be wired between both board | substrates 41 and 42 in U shape in the direction seen from the plane of the board | substrates 41 and 42. As shown in FIG. The horizontal movement distance of the board | substrates 41 and 42 is about 30 mm-60 mm, for example. 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 bending point moves. This is repeated bending.

When a conventional FPC (flexible printed circuit board) is used, the FPC is bent between the two substrates 41 and 42 in a direction orthogonal to the plane direction of the substrate, so that both substrates 41 can be secured to secure the bending diameter. , 42) needs to be increased. In the present invention, the gap between the substrates 41 and 42 is sufficient as the thickness of the harness 11C, and it is not necessary to take as large as in the case of using an FPC, and the device can be made thinner.

11A and 11B are perspective views illustrating examples of the housings 1A and 1B connected by the small-diameter coaxial cable harness 11C. It is preferable to provide the accommodating part 9 which accommodates the harness 11C by predetermined width in housing 1A, 2A. For example, as shown in FIG. 11A, a rectangular recessed portion 9a can be provided as the housing portion 9. As a result, the U-shaped deformation of the harness 11C according to the relative slides of both the housings 1A and 2A is performed in the accommodating portion 9, so that the coaxial cable 12 causes the housings 1A and 2A to be deformed. It can prevent getting caught in between. In addition, both housings 1A and 2A can slide smoothly. Alternatively, as shown in FIG. 11B, the projections 9b may be provided on the housings 1A and 2A in a rectangular shape, for example, to form a receiving portion 9 surrounded by walls.

By using the small diameter coaxial cable 12 thinner than AWG44, harness 11C is easy to bend, and the resistance at the time of sliding of housing 1A, 2A can be made small. In addition, the thickness of the harness 11C can be made thin, and the thickness of the device can be reduced. Since the harness 11C may be flattened by being sandwiched between the housings 1A and 2A, the thickness of the housing portion 9 may be slightly smaller (about 0.2 mm) than the thickness of the harness 11C. As mentioned above, although the harness 11C may contain the small diameter insulated cable without an external conductor, it is preferable that the small diameter insulated cable uses the cable whose outer diameter is less than 0.30 mm.

For example, a monofilament hybrid fiber made of 40 AWG44 thick cables 12 and a waterproof tube 21 made of silicon (2.4 mm in inner diameter and 2.8 mm in outer diameter) and made of a molten liquid crystalline polymer and a flexible polymer. Is passed through the braided sleeve 40 (diameter is 2.8 mm + 0.2 × 2 = 3.2 mm) in a U-shape in a groove having a width (length in the W direction in FIG. 9 (a)) of 20 mm and a depth of 3 mm. The center conductor of the cable 12 does not break even if it accommodates and fixes one end side of the harness and moves the other end side in the longitudinal direction of the groove to repeat 200,000 bending and sliding movements. 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 pressed 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 the sliding motion of the harness, but the rubbing portion is then covered by the sleeve 40. When it is not covered with a sleeve, the frictional force between the waterproof tube 21 of silicon and the upper and lower surfaces of the grooves is large, and it cannot slide properly.

Moreover, even if the harness which performed this sliding motion test was connected to two housings with a waterproof structure as shown in FIG. 7, even if it sank for 30 minutes in the water tank of 1 m of depth, the water-proof tube 21 does not generate | occur | produce, and it is submerged. Does not happen.

When manufacturing the small diameter coaxial cable harness 11A of 1st Embodiment, when the small diameter coaxial cable harness 11A of 1st Embodiment is manufactured, it attaches to the sleeve 40 for every waterproof tube 21 before attaching a sealing cap. Insert it. Or when manufacturing the small diameter coaxial cable harness 11B of 2nd Embodiment, it inserts into the sleeve 40 for every waterproof tape 35 before attaching a sealing cap. In order to prevent the fiber 40 from scattering, the terminal of the sleeve 40 is integrated with each other by heat fusion, 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 enclosed in an ordinary sleeve in which the polymer fibers are woven or knitted. Thereby, bending radius can be made small while obtaining favorable waterproofness, and sliding movement resistance becomes small. The sleeve made of polymer fiber has excellent abrasion resistance, strength, and elastic modulus, and has a good bendability of the harness, and the surface of the fiber is roughened by repeated friction due to sliding motion with the housing, thereby causing shaggy (so-called Neither fibrillated condition, nor torn. Thus, a good sliding motion 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 housing slidably or rotatably connected to each other in precision small devices such as mobile telephone terminals, small video cameras, and notebook computers.

Claims (15)

As a small diameter coaxial cable harness connecting between two housings in which the positional relationship can be changed, The binding part which tied several small diameter coaxial cables, Watertightly attached watertightly to two places of the said binding part, watertightly attached to the said housing Small diameter coaxial cable harness comprising a. The method of claim 1, And said binding portion comprises a watertight tube tightly attached to said watertight portion, covering said periphery of said plurality of small diameter coaxial cables between said watertight portions. The method of claim 2, And the waterproof portion is tightly attached to the waterproof tube by caulking with a metal or a heat shrinkable resin. The method of claim 2, The waterproof part is a small diameter coaxial cable harness, characterized in that the waterproof part is tightly attached to the waterproof tube by press-fitting into the waterproof tube. The method of claim 2, The tie portion is a small diameter coaxial cable harness, characterized in that it is enclosed in a tubular sleeve woven or braided synthetic fibers. The method of claim 5, wherein And said sleeve is braided monofilament hybrid fiber composed of a molten liquid crystalline polymer and a flexible polymer. The method of claim 5, wherein The sleeve is a small diameter coaxial cable harness, characterized in that the synthetic fibers (wrap-knit). The method of claim 1, And the binding portion includes a waterproof tape wound around the plurality of small diameter coaxial cables. The method of claim 8, The said waterproof part is attached to the said engagement part inserted inwardly by caulking, and is provided with the support member which supports the reaction force of the elastic deformation when it adheres to the said housing, The small diameter coaxial cable harness characterized by the above-mentioned. The method of claim 8, The said waterproof tape is wound by multiple layers, changing the winding direction, The small diameter coaxial cable harness characterized by the above-mentioned. The method of claim 8, The binding portion is a small diameter coaxial cable harness, characterized in that it is enclosed in a cylindrical sleeve woven or knitted synthetic fibers. The method of claim 8, And said sleeve is braided monofilament hybrid fiber composed of a molten liquid crystalline polymer and a flexible polymer. The method of claim 8, The sleeve is a small diameter coaxial cable harness, characterized in that the synthetic fiber is warp. The method 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 small diameter coaxial cable harness according to any one of claims 1 to 13 is wired between two housings, The waterproof portion is attached to the introduction point of the small diameter coaxial cable harness into the housing. A connecting structure of a small diameter coaxial cable harness, characterized in that.

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