JP5408021B2 - Thin coaxial cable harness and manufacturing method thereof - Google Patents

Description

  The present invention relates to a thin coaxial cable harness formed by bundling a plurality of thin coaxial cables and a method for manufacturing the same.

In a small precision device such as a portable terminal or a small video camera, circuit boards in a casing that are slidably or rotatably connected to each other are connected by a wiring material.
As such a wiring material, there is a thin coaxial cable harness in which a plurality of thin coaxial cables are bundled. As an example of a small-diameter coaxial cable harness, the waterproof part attached to the introduction part to the housing is composed of a seal cap and an O-ring attached to the outer periphery of the seal cap, and the space between the waterproof parts is covered with a waterproof tube. Is adhered to the housing with an adhesive, and a waterproof tube and a waterproof part are attached in a watertight manner (see, for example, Patent Document 1).

JP 2009-206043 A

In electronic devices such as portable terminals, small video cameras, and digital cameras, the devices are further reduced in size and thickness, and the accommodation space for the coaxial cable harness is further thinned and narrowed. For this reason, in the coaxial cable harness in which the intermediate portions are bundled in one round, it may be difficult to wire the bundled intermediate portions in a thin and narrow accommodation space.
Moreover, in the coaxial cable harness in which the intermediate part is bundled into one round, the cross-sectional shape of the waterproof part of the harness becomes large. For example, if the cross-section of the waterproof part is circular, the diameter becomes large. Therefore, it has been difficult to reduce the thickness of the waterproof part attached to the housing.

  An object of the present invention is to provide a small-diameter coaxial cable harness that can secure good waterproofness and can be wired in a thin and narrow place, and a method for manufacturing the same.

The small-diameter coaxial cable harness of the present invention that can solve the above-described problems includes a plurality of small-diameter coaxial cables, a plurality of waterproof tubes, and a waterproof cap having a plurality of insertion holes,
The plurality of small-diameter coaxial cables are divided into a plurality of groups, at least a portion other than the terminal portion, and each group is inserted through the waterproof tube, and the positional relationship between the small-diameter coaxial cables changes. Are bundled to such an extent that they can be inserted through the insertion holes,
The waterproof cap is collectively connected in a watertight manner to the ends of the plurality of waterproof tubes.

In the thin coaxial cable harness of the present invention, a metal tube is press-fitted inside the waterproof tube,
Preferably, the waterproof cap is made of an elastic material, and the waterproof tube is compressed by being sandwiched between the waterproof cap and the metal tube in the thickness direction.

  In the thin coaxial cable harness of the present invention, it is preferable that the waterproof cap is made of an elastic material, and a protrusion protruding in a direction perpendicular to the axial direction of the insertion hole is formed on the outer periphery of the waterproof cap.

  In the thin coaxial cable harness of the present invention, it is preferable that a connector is attached to at least one end side of the plural thin coaxial cables.

In addition, the method for manufacturing a thin coaxial cable harness according to the present invention is a method for manufacturing a thin coaxial cable harness comprising a plurality of thin coaxial cables, a plurality of waterproof tubes, and a waterproof cap having a plurality of insertion holes. Because
Dividing at least a portion of the plurality of small coaxial cables other than the terminal portion into a plurality of groups,
Each of the groups is inserted into the waterproof tube and bundled to such an extent that the positional relationship between the small-diameter coaxial cables can be changed.
The waterproof cap is connected in a watertight manner to the ends of the plurality of waterproof tubes.

In the manufacturing method of the thin coaxial cable harness of the present invention, the waterproof cap is made of an elastic material,
Preferably, a metal tube is press-fitted inside the waterproof tube, and the waterproof tube is compressed between the waterproof cap and the metal tube in the thickness direction.

  According to the present invention, a plurality of small-diameter coaxial cables are divided into a plurality of groups at locations other than the terminal portion, and each group is inserted through the waterproof tube. The wiring can be made thinner than when bundled in one and passed through the waterproof tube. In addition, the waterproof tube into which the small-diameter coaxial cable is inserted is inserted into the insertion hole of the waterproof cap, and the waterproof cap is connected to the end of the waterproof tube in a watertight manner. Can also be thinned. Thereby, it can wire thinly, ensuring favorable waterproofness, and it can wire by attaching a waterproof cap also to the thin attachment location of a housing | casing.

  Further, when the waterproof cap is made of an elastic material, an O-ring is not necessary, so that a good waterproof structure can be obtained without causing an increase in cost. An O-ring having a diameter corresponding to the outer diameter on the mounting side must be selected and prepared. Use of the O-ring is limited except for a member having a circular outer shape, but the O-ring is not necessary in the present invention. Therefore, there is no restriction on the shape of the waterproof cap, the waterproof cap can be made to have a thin outer shape corresponding to the housing side to be connected, and a good waterproof structure can be obtained while enabling wiring in thin and narrow places.

It is a perspective view of the mobile phone connected with the thin coaxial cable harness of this invention, (a) is the state which opened the housings of the mobile phone, (b) is the state which closed the housings of the mobile phone terminal. . It is a top view which shows an example of embodiment of the thin coaxial cable harness which concerns on this invention. It is a top view which shows the other example of embodiment of the thin coaxial cable harness which concerns on this invention. It is a perspective view at the time of attaching a metal pipe and a waterproof cap to a waterproof tube. It is sectional drawing at the time of attaching a metal pipe and a waterproof cap to a waterproof tube. It is sectional drawing which shows the state which attached the thin diameter coaxial cable harness of FIG. 2 or FIG. 3 to the housing | casing.

Hereinafter, an example of an embodiment of a thin coaxial cable harness and a manufacturing method thereof according to the present invention will be described with reference to the drawings.
The thin coaxial cable harness according to the present embodiment is connected to a substrate in the casings 2 and 3 that slide relative to a device such as a mobile phone 1 as shown in FIG. In the cellular phone 1, one housing 2 is provided with a display, and the other housing 3 is provided with a key operation unit.

  As shown in FIG. 2, the small-diameter coaxial cable harness 11 has a plurality (40 to 50) of thin-coaxial cables 12, and a plurality of (in this embodiment) a bundle of these divided into a plurality of groups. Two) bundle portions 10 are provided. At the terminal portions at both ends of the small-diameter coaxial cable harness 11, the small-diameter coaxial cables 12 are arranged in a planar shape, and a connector 13 for connection to the housing 2 of the mobile phone 1 and the wiring board in the housing 3 is attached. Has been terminated.

  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 AWG (American Wire Gauge) standard. It is desirable to use a 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 housing 2 and the housing 3 slide. Further, when a plurality of small coaxial cables 12 are bundled to form a plurality of bundle portions 10, the thickness of the bundle portion 10 can be reduced, and high-density wiring in a limited wiring space is possible. To do.

  In each bundle portion 10 of the small-diameter coaxial cable harness 11, a plurality of small-diameter coaxial cables 12 are inserted into the waterproof tube 21, and the positional relationship between the small-diameter coaxial cables 12 can be changed by the waterproof tube 21. It is bundled to the extent. The waterproof tube 21 has excellent waterproof properties, and is formed of, for example, a soft resin such as fluororesin, polyolefin, or silicone rubber, or a porous body thereof.

  Each bundle portion 10 includes about 20 small-diameter coaxial cables 12. When the thin coaxial cable 12 is AWG 46 and the number of the thin coaxial cables 12 in one bundle portion 10 is 20, when the thin coaxial cable 12 is inserted into the waterproof tube 21 and bundled, The outer diameter of the waterproof tube 21 can be set to about 1.9 mm.

  At both end portions of each bundle portion 10, a common waterproof cap 14 is collectively connected to the end portions of the respective waterproof tubes 21 in a watertight manner. A plurality of insertion holes 16 (see FIG. 4) corresponding to the plurality of waterproof tubes 21 are formed in the waterproof cap 14. A waterproof cap 14 is attached to the inside of these insertion holes 16. Further, the small-diameter coaxial cable 12 of each bundle portion 10 inserted through the waterproof tube 21 is also inserted through the insertion hole 16 of the waterproof cap 14.

  In the thin coaxial cable harness 11 of FIG. 2, waterproof caps 14 are connected to both ends of the two bundle portions 10 one by one. On the end side from the waterproof cap 14, a plurality of small-diameter coaxial cables 12 extending from the waterproof tubes 21 of the two bundle portions 10 are exposed and arranged in parallel in a planar shape, and one connector 13 is connected to one end. ing.

  As another example, the small-diameter coaxial cable harness 11a of FIG. 3 has a plurality of small-diameter coaxial cables 12 extending from the waterproof tubes 21 of the two bundle portions 10 while being divided into groups of the bundle portions 10. These are arranged in parallel in a planar shape and connected to different connectors 13a for each group. Further, the length of the small-diameter coaxial cable 12 may be changed for each group of the bundle portions 10.

  The configuration shown in FIG. 2 or the configuration shown in FIG. 3 can be appropriately selected according to the wiring requirements in the casings 2 and 3. Moreover, it is good also considering the one end of a thin coaxial cable harness as the form of FIG. 2, and making the other end into the form of FIG.

Next, the attachment structure of the waterproof cap 14 to the waterproof tube 21 and the attachment method will be described.
As shown in FIG. 4, in a state where a desired number of small-diameter coaxial cables 12 are inserted through each waterproof tube 21, the metal tube 17 is connected from the end side for each group of the small-diameter coaxial cables 12. Insert inside. As shown in FIG. 5, the metal tube 17 is inserted and attached inside the end portion of the waterproof tube 21. The outer diameter of the metal tube 17 is preferably equal to or larger than the inner diameter of the waterproof tube 21. For example, when the waterproof tube 21 has an inner diameter of 1.5 mm and an outer diameter of 1.9 mm, the metal tube 17 may have an inner diameter of 1.5 mm and an outer diameter of 1.7 mm. By inserting such a metal tube 17 into the waterproof tube 21, the waterproof tube 21 is pushed out radially and elastically deformed, and is in close contact with the outer peripheral surface of the metal tube 17.

  In addition, a flange 18 is formed at one end of the metal tube 17 so as to protrude radially outward. When the metal tube 17 is inserted into the waterproof tube 21, the flange 18 is locked to the end surface of the waterproof tube 21, whereby the metal tube 17 is positioned relative to the waterproof tube 21 in the length direction.

  The waterproof cap 14 is made of an elastic resin material such as silicone rubber, and is attached to the outer periphery of the end portion of the waterproof tube 21. The insertion hole 16 of the waterproof cap 14 has an inner diameter of 2.0 mm, for example, and is attached to the outer periphery of the waterproof tube 21 into which the metal tube 17 is inserted, thereby pressing the waterproof tube 21 toward the inner diameter side. That is, the end portion of the waterproof tube 21 is compressed by being sandwiched in the thickness direction by being pressed by the metal tube 17 and the waterproof cap 14 from inside and outside. Thereby, the waterproof cap 14 is connected to the waterproof tube 21 in a watertight manner.

  The waterproof cap 14 has an oval cross-sectional shape, and the outer periphery of the waterproof cap 14 has a protrusion protruding in a direction perpendicular to the axial direction of the insertion hole 16 at a central portion when viewed in the axial direction of the insertion hole 16. The strip 15 is formed continuously in the circumferential direction. The location where the waterproof cap 14 is attached to the housing is a recess surrounded by a wall surface surrounding the waterproof cap 14. The cross section of the recess is slightly smaller than the cross section of the waterproof cap 14, and the waterproof cap 14 is press-fitted into the recess so that the small-diameter coaxial cable harness 11 is attached to the housing in a watertight manner. The protrusions 15 of the waterproof cap 14 are pressed against the recesses 2a and 3a (see FIG. 6) of the housing to which the waterproof cap 14 is attached and are crushed so that the waterproof cap 14 and the housing are more reliably watertight. it can. Since the protrusion 15 is integrally formed with the waterproof cap 14, the cost can be reduced as compared with the case where an O-ring is separately used.

  Since the waterproof tube 21 is made of a soft resin such as silicone rubber, a dimensional error is likely to occur even if an inner diameter and an outer diameter are manufactured to predetermined dimensions. However, since the wall thickness can be easily obtained with an accurate dimension, the variation in the wall thickness of the waterproof tube 21 is relatively small. By setting the difference between the outer diameter of the metal tube 17 and the inner diameter of the insertion hole 16 of the waterproof cap 14 to be smaller than the thickness of the waterproof tube 21, there is little variation in the thickness of the waterproof tube 21. It can be reliably compressed in the vertical direction, and it becomes easy to obtain water tightness.

  A preferable procedure for attaching the waterproof cap 14 to the waterproof tube 21 is as follows. First, as shown in FIG. 5, the waterproof tube 21 through which the group of small-diameter coaxial cables 12 is inserted is passed through the insertion hole 16 of the waterproof cap 14. 14 is arranged on the inner side in the length direction from the end of the waterproof tube 21. Then, the group of small coaxial cables 12 is inserted from the end into the inside of the metal tube 17, and the metal tube 17 is press-fitted into the inside of the end of the waterproof tube 21. In this state, the waterproof cap 14 is moved to the end of the waterproof tube 21. At this time, the outer diameter of the end portion of the waterproof tube 21 is larger than the inner diameter of the insertion hole 16 of the waterproof cap 14, so that the insertion hole 16 of the waterproof cap 14 slides and moves to the end portion of the waterproof tube 21.

By such a procedure, it is easy to watertightly attach the waterproof cap 14 by compressing the end of the waterproof tube 21 in the thickness direction. The waterproof cap 14 can be attached to the plurality of waterproof tubes 21 at once.
The connection of the connector 13 to the small-diameter coaxial cable 12 may be performed after the small-diameter coaxial cable 12 is passed through the waterproof tube 21, the waterproof cap 14, and the metal tube 17.

  In order to attach the small-diameter coaxial cable harness 11 to the case 2 and the case 3 constituting the mobile phone 1 or the camera, first, a plurality of small-diameter coaxial cables are attached before the connector 13 is attached to the small-diameter coaxial cable 12. 12 is assembled through a waterproof tube 21, a waterproof cap 14, and a metal tube 17. Next, as shown in FIG. 6, the thin coaxial cable 12 exposed on the end side from the waterproof tube 21 is passed through the insertion hole 2b of the housing 2 and the insertion hole 3b of the housing 3, respectively. The waterproof cap 14 at the end of the bundle portion 10 is fitted into the recess 3 a of the housing 3. The recesses 2a and 3a have an oval shape in plan view. The protrusion 15 provided on the outer periphery of the waterproof cap 14 is pressed and crushed by the recesses 2a and 2b, so that the waterproof cap 14 and the casings 2 and 3 are watertight. Since the waterproof cap 14 and the waterproof tube 21 are connected in a watertight manner, water does not enter the inside of the housing 2 or the housing 3 (connector 13 side) through the small-diameter coaxial cable harness 11.

  FIG. 6 is a cross-sectional view of the casing 2 and a part of the casing 3 in the thickness direction, and only one of the plurality of bundle portions 10 is shown. Another bundle 10 exists. That is, each group of the small-diameter coaxial cables 12 constituting the small-diameter coaxial cable harness 11 is arranged side by side in the surface direction in which the housing 2 and the housing 3 slide. Thereby, it becomes possible to wire between the housing | casing 2 and the housing | casing 3 thinly compared with the case where all the thin coaxial cables which comprise a thin coaxial cable harness are bundled together and let it pass through a waterproof tube. In addition, since the waterproof cap 14 is connected to the end of the waterproof tube 21 in a watertight manner, the cross-sectional outer shape of the waterproof cap 14 can be reduced. Thereby, the height H of the recessed parts 2a and 2b of the housing | casing 2 and the housing | casing 3 can be made low.

  Thus, according to the small-diameter coaxial cable harness 11 of the present embodiment, thin wiring can be performed while ensuring good waterproofing, and the waterproof cap 14 is also attached to the thin mounting locations of the housings 2 and 3 for wiring. Can do. And the housing | casing 2 and 3 can also be made thin.

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

  Further, if waterproofing is to be obtained with an O-ring, the O-ring is an expensive member, which increases the cost. In this embodiment, since it is not necessary to use an O-ring, a good waterproof structure can be obtained without causing an increase in cost. In the case of using an O-ring, it is necessary to form an O-ring mounting groove in the waterproof cap 14, but this is not necessary in this embodiment. In addition, the O-ring must be prepared by selecting one having a diameter corresponding to the outer diameter on the mounting side, and the use of the O-ring is limited except for a member having a circular outer shape. Since no ring is required, there is no restriction on the shape of the waterproof cap 14. Accordingly, the waterproof cap 14 can have a thin outer shape corresponding to the side of the housings 2 and 3 to be connected, and a good waterproof structure can be obtained while enabling wiring in thin and narrow places.

  The small-diameter coaxial cable harness 11 is formed by bundling the bundle portion 10 with, for example, a braided sleeve in which monofilament fibers are knitted into a cylindrical shape, or by spirally winding a bundle tape or yarn that is more slippery than the waterproof tube 21. They may be bundled, and in this way, the insertion operation into the waterproof tube 21 can be facilitated.

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

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

  As another embodiment according to the present invention, a resin block made of a hard resin can be used instead of the waterproof cap 14 made of an elastic material. In that case, the inner diameter of the insertion hole of the resin block is made smaller than that of the waterproof tube, and the waterproof tube and the resin block are connected in a watertight manner as a form in which the end of the waterproof tube is press-fitted into the insertion hole of the resin block. Then, a waterproof adhesive tape is provided on the surface of the resin block opposite to the connection side with the waterproof tube, and the resin block is fitted into the recess of the housing, and the waterproof adhesive tape is bonded to the inside of the recess to Ensure water tightness between block and housing.

  The material of the resin block is, for example, a hard resin such as ABS, polycarbonate, or polyacetal, and the waterproof adhesive tape is, for example, a film made of polyester as a base material, and an adhesive is laminated on the front and back surfaces of the base material. It is. As the adhesive to be laminated on the base material, for example, an acrylic or butyl rubber adhesive is preferable.

DESCRIPTION OF SYMBOLS 1: Mobile phone, 2, 3: Housing, 2a, 3a: Concave part, 10: Bundle part, 11: Fine coaxial cable harness, 12: Fine coaxial cable, 13: Connector, 14: Waterproof cap, 15: Projection , 16: insertion hole, 17: metal tube, 21: waterproof tube

Claims (6)

A plurality of small coaxial cables, a plurality of waterproof tubes, and a plurality of waterproof caps having a plurality of insertion holes,
The plural thin coaxial cables are divided into a plurality of groups at least a part other than the terminal portion ,
Each said group, at Rukoto is inserted into the waterproof tube different one for each one group, bundled to the extent that positional relationship between each of said small diameter coaxial cable may vary,
Each of the groups is inserted through one insertion hole that is different for each group ,
Thin coaxial cable harness the waterproof cap on each of both ends of the plurality of the waterproof tube, characterized in that it is connected watertight manner collectively. The thin coaxial cable harness according to claim 1,
A metal tube is press-fitted inside the waterproof tube,
The thin coaxial cable harness, wherein the waterproof cap is made of an elastic material, and the waterproof tube is sandwiched and compressed between the waterproof cap and the metal tube in a thickness direction. The thin coaxial cable harness according to claim 1 or 2,
The small-diameter coaxial cable harness, wherein the waterproof cap is made of an elastic material, and a protrusion protruding in a direction perpendicular to the axial direction of the insertion hole is formed on an outer periphery of the waterproof cap. A thin coaxial cable harness according to any one of claims 1 to 3,
A thin coaxial cable harness, wherein a connector is attached to at least one end of the plural thin coaxial cables. A method for producing a thin coaxial cable harness comprising a plurality of thin coaxial cables, a plurality of waterproof tubes, and a plurality of waterproof caps having a plurality of insertion holes,
Dividing at least a portion of the plurality of small coaxial cables other than the terminal portion into a plurality of groups,
Each said group, in Rukoto are inserted into the waterproof tube different one for each one group, bundled to the extent that positional relationship between each of said small diameter coaxial cable may vary,
Each of the groups is inserted through the one through hole that is different for each group ,
Method for manufacturing a thin coaxial cable harnesses, characterized in that to connect together the waterproof cap on each of both ends of the plurality of the waterproof tube watertight manner. It is a manufacturing method of the thin coaxial cable harness according to claim 5,
The waterproof cap is made of an elastic material,
A method of manufacturing a thin coaxial cable harness, wherein a metal tube is press-fitted inside the waterproof tube, and the waterproof tube is compressed between the waterproof cap and the metal tube in a thickness direction.

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