JP2011258726A - Sealing member and cable with sealing member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing member which can reliably seal, with a sealing material, a gap from the inner periphery of a cable through-hole formed on an electronic device housing and a gap from a cable, and to provide a cable equipped with the sealing member.SOLUTION: On a sealing member 2, a tapered inner periphery 21 is formed in which an opening provided on one end of an inner periphery for inserting a cable 1 gradually becomes smaller toward an opening on the other end. The tapered inner periphery is filled with a sealing material 3. As mentioned above, the extended opening on one end of the tapered inner periphery makes it easy to sufficiently fill the sealing material from the large opening into the tapered inner periphery. In addition, because the opening of the tapered inner periphery is formed to be gradually smaller, the cable 1 can be reliably held at the small opening.

Description

  The present invention includes an outer peripheral portion that is in close contact with an inner peripheral portion of a cable through hole formed in a housing of an electronic device, and an inner peripheral portion through which the cable is inserted, and between the cable and the inner peripheral portion of the cable through hole. It is related with the sealing member which seals between, and the cable with a sealing member provided with this sealing member.

  In recent years, for example, small electronic communication devices such as mobile phones for communication and telephone calls, which are one of electronic devices, have been provided in various forms such as a folding type in order to further reduce the size. Yes. The foldable small electronic communication device has a structure in which an operation button and a liquid crystal display are disposed in two casings, and the two casings are connected to each other through a hinge mechanism so as to be freely rotatable. When the user does not use the small electronic communication device, the user folds and holds the two housings around the hinge mechanism, and when using the small electronic communication device, the two housings center around the hinge mechanism. Unfold and press the operation button or look at the liquid crystal display to make calls and send / receive emails.

  This type of small electronic communication device has a housing with operation buttons, etc. and a housing with a liquid crystal display, etc. Wiring that is electrically connected while being maintained is required. For this reason, for example, in Patent Documents 1 and 2, a cylindrical terminal fixing member (seal, waterproof part) is attached to the outer periphery of both ends of a flexible tube in a watertight manner, and the terminal is attached to a cable through hole formed in each housing. A fixing member is attached in a watertight manner and the two housings are connected by a tube, and a circuit built in both the housings is electrically connected through a plurality of coaxial cables in this tube to ensure waterproofness. It is disclosed.

JP 2008-263285 A JP 2009-206043 A

  When waterproofing is ensured by using the above-described conventional tube, the outer diameter of the coaxial cable becomes thicker by the thickness of the tube, which causes the electronic device to become larger. In order to solve this problem, a plurality of coaxial cables may be bundled and the cables may be bonded together with an adhesive and bonded to a cable through hole formed in the housing. However, it is difficult for the adhesive to flow between a plurality of coaxial cables, and voids may be generated, resulting in poor watertightness.

  The present invention has been made in view of the problems as described above, and an object of the present invention is to provide a sealing member capable of sufficiently filling a sealing material between the cable and a sealing member provided with the sealing member. The object is to provide a cable with members.

  To achieve the above object, the sealing member of the present invention includes an outer peripheral portion that is in close contact with an inner peripheral portion of a cable through hole formed in a housing of an electronic device, and an inner peripheral portion through which the cable is inserted, A sealing member that seals between the cable and the inner peripheral portion of the cable through hole, the opening from one end of the inner peripheral portion through which the cable is inserted toward the opening on the other end. A gradually decreasing inner peripheral portion having a gradually decreasing opening is formed, and the gradually decreasing inner peripheral portion is filled with a sealing material. As described above, since the opening on one end side of the gradually decreasing inner peripheral portion is expanded, it is easy to sufficiently fill the sealing material into the gradually decreasing inner peripheral portion from the large opening, and the opening of the gradually decreasing inner peripheral portion is gradually reduced. Therefore, the cable can be sealed in a watertight manner at the small opening. Therefore, it is possible to prevent moisture from entering the housing of the applied electronic device and protect the built-in circuit.

  Further, the gradually decreasing inner peripheral portion is the sealing material applied to the outer periphery of the cable extending outward from the gradually decreasing inner peripheral portion, and the cable is pulled inward from the gradually decreasing inner peripheral portion. The sealing material drawn in is filled with the sealing material. As described above, the sealing material previously applied to the cable is drawn into the gradually decreasing inner peripheral portion and is narrowed, so that between the cable and the gradually decreasing inner peripheral portion, and when there are a plurality of cables, between the multiple cables. It is possible to remove the voids sufficiently by flowing into the water, and to seal the space extremely effectively. Therefore, it is possible to prevent moisture from entering the housing of the applied electronic device and protect the built-in circuit. At this time, the gradually decreasing inner peripheral portion is preferably formed in a tapered shape from the viewpoint of easy flow of the sealing material and prevention of damage to the cable.

  Moreover, it is a cable provided with said each sealing member, It is characterized by the above-mentioned. Thereby, the cable which shows said each effect can be provided. Further, in the assembly of electronic equipment, the work is performed through a sealing member through which a plurality of cables are inserted, so that the labor of bundling the plurality of cables can be omitted, and the working efficiency can be improved and the manufacturing cost can be kept low. .

It is an axial direction sectional view showing a cable with a sealing member of an embodiment of the invention. (A), (B), (C) is a figure for demonstrating the method of filling the sealing material in the gradually decreasing inner peripheral part of a sealing member. It is the perspective view which shows the state which attached the cable with a sealing member to the housing | casing of an electronic device, and its sectional drawing. (A), (B) is an axial sectional view showing another example of the sealing member.

  Hereinafter, embodiments of the present invention will be described. The embodiments described below do not limit the invention according to the scope of claims, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. Absent.

  FIG. 1 is an axial sectional view showing a cable with a sealing member according to an embodiment of the present invention. This cable 10 with a sealing member has a configuration in which a sealing member 2 is integrated with a plurality of coaxial cables 1 bundled in a cylindrical shape via a sealing material 3. The sealing member 2 is formed in a cylindrical body having an annular cross section, and the tapered inner peripheral portion 21 is formed on the inner peripheral portion 20 on one end side from the opening on one end side of the inner peripheral portion 20. A gradually decreasing inner peripheral portion 21 having a shape in which the opening gradually decreases toward the opening on the other end side is formed, and a cylindrical inner peripheral portion 22 is continuous with the gradually decreasing inner peripheral portion 21 on the inner peripheral portion 20 on the other end side. It is formed to do. As the material of the sealing member 2, a general resin, for example, acrylonitrile / butadiene / styrene copolymer synthetic resin (ABS resin), acrylic resin, polycarbonate resin, or the like is used.

  The opening on one end side of the gradually decreasing inner peripheral portion 21 is formed to have a larger diameter than the outer diameter of the plurality of coaxial cables 1 bundled in a cylindrical shape, and the opening on the other end side of the gradually decreasing inner peripheral portion 21 is in a cylindrical shape. The bundled coaxial cables 1 are formed to have a slightly larger diameter than the outer diameter. The cylindrical inner peripheral portion 22 is continuous with the opening on the other end side of the gradually decreasing inner peripheral portion 21 and is formed to have a diameter slightly larger than the outer diameter of the plurality of coaxial cables 1 bundled in a cylindrical shape. Such a gradually decreasing inner peripheral portion 21 is filled with the sealing material 3. As the sealing material 3, an adhesive that can be bonded to the jacket of the coaxial cable 1 and the sealing member 2, for example, a silicone resin adhesive, an ultraviolet curable resin adhesive, an epoxy resin adhesive, an acrylic resin adhesive An agent or the like is used. Thereby, the waterproofness between the sealing member 2 and the coaxial cable 1 and between the plurality of coaxial cables 1 is maintained. Note that the sealing material 3 may be filled from the gradually decreasing inner peripheral portion 21 to the cylindrical inner peripheral portion 22, thereby further improving the waterproofness.

  Here, a method of filling the gradually decreasing inner peripheral portion 21 with the sealing material 3 will be described with reference to FIG. First, a plurality of coaxial cables 1 bundled in a cylindrical shape are passed through the inner peripheral portion 20 of the sealing member 2, and a plurality of bundled cylindrical shapes extending outward from the gradually decreasing inner peripheral portion 21 of the sealing member 2. A part of the coaxial cable 1 is made flat. Then, as shown in FIG. 2A, a plurality of flattened coaxial cables 1 are fixed on a set base 40 by a fixing member 41 and sealed from the outer periphery of the flattened coaxial cables 1. Stop material 3 is applied. Further, the sealing material 3 is also applied to the back side of the plurality of coaxial cables 1 that are flattened by inverting the set table 40. At this time, the viscosity of the sealing material 3 is several Pa (pascal) × second (s) to several hundred Pa (pascal) × second (s) so that the sealing material 3 is held without falling from the coaxial cable 1. It is desirable to be adjusted to. Further, if the sealing material 3 can be applied to the entire outer periphery of the plurality of coaxial cables 1 made flat, the sealing material 3 is applied only from one side without inverting the set table 40. May be.

  Next, as shown in FIG. 2B, the plurality of coaxial cables 1 are removed from the set base 40, and the sealing member 2 is fixed to the jig 42. Then, as shown in FIG. 2C, a plurality of coaxial cables 1 bundled in a cylindrical shape extending outward from the cylindrical portion 22 of the sealing member 2 are pulled and a plurality of the sealing materials 3 are applied. The portion of the coaxial cable 1 is drawn into the gradually decreasing inner peripheral portion 21 of the sealing member 2. At this time, since the opening on one end side of the gradually decreasing inner peripheral portion 21 is widened, it is easy to sufficiently fill the sealing material 3 into the gradually decreasing inner peripheral portion 21 from the large opening, and the opening of the gradually decreasing inner peripheral portion 21 is further increased. Since the diameter gradually decreases, the plurality of coaxial cables 1 can be sealed in a watertight manner in a very small opening.

  That is, when the plurality of coaxial cables 1 extending outward from the cylindrical portion 22 are pulled, the sealing material 3 applied to the plurality of coaxial cables 1 extending outward from the gradually decreasing inner peripheral portion 21 is: Since the taper is drawn into the gradually decreasing inner peripheral portion 21 and is narrowed down, between the gradually decreasing inner peripheral portion 21 and the plurality of coaxial cables 1 bundled in a cylindrical shape and a plurality of coaxial cables bundled in a cylindrical shape. The voids can be removed by sufficiently flowing between the cables 1, and the occurrence of poor watertightness can be reliably prevented. Finally, the sealing material 3 is cured at room temperature, or if necessary, the sealing material 3 is heat-cured to form a cable 10 with a sealing member.

  A groove 23 into which the seal member 4 is fitted is formed on the entire outer periphery of the sealing member 2 on the other end side. For example, an O-ring is used as the seal member 4. The sealing member 2 into which the sealing member 4 is fitted is fitted into the cable through holes 33 and 34 provided in the upper lid 31 and the lower lid 32 constituting the housing 30 of the electronic device shown in FIG. Since the diameters of the cable through holes 33 and 34 are formed to be slightly smaller than the outer diameter of the seal member 4 fitted in the sealing member 2, the seal member 4 is formed on the inner peripheral portion of the cable through holes 33 and 34. It is pressed by 33a, 34a.

  Here, the seal member 4 is made of a softer resin or an elastic body such as fluororubber than the upper lid 31 (inner peripheral portion 33a of the cable through hole 33) and the lower lid 32 (inner peripheral portion 34a of the cable through hole 34). Is formed. For this reason, the seal member 4 is slightly crushed by the compressive force of the inner peripheral portions 33a and 34a of the cable passage holes 33 and 34, and the outer periphery thereof is in close contact with the inner peripheral portions 33a and 34a of the cable passage holes 33 and 34. Thereby, the sealing property between the sealing member 2 and the cable through holes 33 and 34 of the housing 30 can be maintained, moisture intrusion into the housing 30 can be prevented, and the built-in circuit can be protected.

  Instead of the groove 23, a convex portion having a semicircular cross section may be integrally formed on the outer peripheral portion on the other end side of the sealing member 2 over the entire circumference as a sealing member. Thereby, the number of parts can be reduced. The sealing member 2 including the convex portion at this time is made of a softer resin or fluororubber than the upper lid 31 (inner peripheral portion 33a of the cable through hole 33) and the lower lid 32 (inner peripheral portion 34a of the cable through hole 34). The convex portion is slightly crushed by the compressive force of the upper lid 31 and the lower lid 32, and the outer periphery thereof is in close contact with the inner peripheral portions 33a, 34a of the cable through holes 33, 34. Also by this, the sealing performance between the sealing member 2 and the cable through holes 33 and 34 of the housing 30 can be maintained.

  As the coaxial cable 1, the cable jacket may be formed in a two-layer structure of an inner layer and an outer layer described below. The inner layer is formed of an adhesive fluororesin that can be thinned and has excellent weather resistance, electrical characteristics, heat resistance, chemical resistance, and the like, and the outer layer is particularly melt adhesive that can be bonded to the sealing material 3. Made of a polyamide resin. A modified ethylene-tetrafluoroethylene copolymer (ETFE) is used as the adhesive fluororesin, and an adhesive nylon is used as the melt-adhesive polyamide resin. Here, the modified ETFE is a copolymer containing, in an ETFE monomer, a monomer having an adhesive functional group such as a hydroxyl group or a carboxylic anhydride group and a monomer such as fluoroalkyl / ethylene or hexafluoropropylene.

  Note that the plurality of coaxial cables 1 may be woven cables made of resin yarns. Polyester yarn is used as the resin yarn. Since the woven cable has a plurality of coaxial cables 1 arranged in parallel in a plane and is knitted with resin yarn (woven yarn), it can be easily flattened when the sealing material 3 is applied. . In addition, since the woven cable is not in close contact with the adjacent coaxial cable 1 due to the woven yarn and a gap is formed, the entire circumference of all the coaxial cables 1 can be easily covered with the sealing material 3.

  The coaxial cable 1 having such a configuration is formed by the following procedure. First, a central conductor is formed by twisting a plurality of conductors, and a dielectric material is formed on the outer periphery of the central conductor by melt extrusion coating using an extruder (not shown). Next, an outer conductor is formed by horizontally winding a plurality of conductor wires in the longitudinal direction on the outer periphery of the dielectric, and an inner layer made of an adhesive fluororesin is used on the outer periphery of the outer conductor layer using an extruder. Then, the outer layer made of an adhesive polyamide-based resin is melt-extruded and coated at a time to form a cable jacket, whereby the coaxial cable 1 is completed. For the conductor of the central conductor, for example, a silver-plated copper alloy wire, and for the dielectric material, a fluororesin such as perfluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), etc. As the conductor wire of the outer conductor, for example, a tin-plated copper alloy wire can be used.

  Next, the cable 10 with a sealing member of this embodiment was produced as follows and the sealing performance was evaluated. The sealing performance was evaluated by attaching the cable 10 with a sealing member of the present embodiment to a jig simulating the housing 30 and applying water pressure of 100 KPa (corresponding to a water depth of 10 m) from the inside of the jig to confirm the presence or absence of water leakage. . The coaxial cable 1 of the cable 10 with a sealing member of the present embodiment has the following configuration. A central conductor is formed by twisting seven silver-plated annealed copper wires with an outer diameter of 0.016 mm, and a dielectric is formed so that the outer periphery of the central conductor is covered with PFA to an outer diameter of 0.12 mm. Then, 17 tin-plated annealed copper wires having an outer diameter of 0.025 mm corresponding to the conductor strands are laterally wound in the longitudinal axis direction on the outer periphery of the dielectric to form an external conductor.

  Then, an outer layer of a cable jacket made of modified ETFE having a thickness of 0.02 mm and an outer layer of a cable jacket made of adhesive nylon having a thickness of 0.005 mm are formed by collectively extruding and coating the outer periphery of the outer conductor. Finally, an outer diameter of 0.22 mm is produced, and 40 coaxial cables 1 are arranged and woven with polyester yarn. The sealing member 2 of the cable 10 with a sealing member of the present embodiment was formed of ABS resin. As the sealing material 3, a silicon resin adhesive (trade name: Super X, manufactured by Cemedine Co., Ltd.) was used. In the cable 10 with a sealing member of the present embodiment having such a configuration, no water leakage occurred.

  In the embodiment described above, a plurality of coaxial cables 1 are inserted into the sealing member 2 and sealed, but a single coaxial cable 1 can be similarly sealed. Further, not only the coaxial cable 1 but also a so-called simple line or linear member (cable) can be similarly sealed. Further, the shape of the gradually decreasing inner peripheral portion 21 of the sealing member 2 is not limited to the tapered shape, and one end side of the inner peripheral portion 20 from the viewpoint of easy flow of the sealing material 3 and prevention of damage to the coaxial cable 1. If the opening gradually decreases from the opening toward the opening on the other end side, for example, a shape with an R chamfer 21a as shown in FIG. A shape with a plurality of steps (in this example, two steps) tapers 21b and 21c as shown in FIG.

  The cable with a sealing member according to the present invention can be applied to all electronic devices such as small electronic communication devices and personal computers.

  DESCRIPTION OF SYMBOLS 1 Coaxial cable, 2 Sealing member, 3 Sealing material, 4 Sealing member, 10 Cable with sealing member, 20 Inner peripheral part, 21 Gradually increasing inner peripheral part, 22 Cylindrical inner peripheral part, 30 Case, 33, 34 Cable Through hole

Claims (4)

An outer peripheral part closely contacting the inner peripheral part of the cable through hole formed in the housing of the electronic device and an inner peripheral part through which the cable is inserted, between the cable and between the inner peripheral part of the cable through hole A sealing member for sealing
A gradually decreasing inner peripheral portion is formed in which the opening gradually decreases from the opening on one end side of the inner peripheral portion through which the cable is inserted toward the opening on the other end side, and the gradually decreasing inner peripheral portion is filled with a sealing material. A sealing member characterized by being made.   The gradually decreasing inner peripheral portion is the sealing material applied to the cable extending outward from the gradually decreasing inner peripheral portion, and the cable is drawn by being pulled inward from the gradually decreasing inner peripheral portion. The sealing member according to claim 1, wherein the sealing member is filled.   The sealing member according to claim 1, wherein the gradually decreasing inner peripheral portion is formed in a tapered shape.   It is a cable provided with the sealing member as described in any one of Claims 1-3, The cable with a sealing member characterized by the above-mentioned.

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