JP2009283879A - Cable with sealing member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cable with a sealing member for surely sealing between a cable through-hole formed in a casing and the cable to be threaded through the cable through-hole. <P>SOLUTION: The cable 1 with the sealing member includes: a sealing member body 11 having a body outer peripheral part 13 where the sealing member 10 comes in close contact with an inner peripheral part 33a of the cable through-hole 33 and a body inner peripheral part 11b into which the cable 20 is inserted; and a sealing member projection part 12 having a projection inner peripheral part 12b projected from the sealing member body, connected to the body inner peripheral part, and into which the cable is inserted, and the cable is fused to the projection inner peripheral part of the sealing member projection part. Thus, a part of the cable is not exposed from the side of the sealing member, and between the cable through-hole formed in the casing and the cable to be threaded into the cable through-hole is surely sealed, and intrusion of moisture in the casing is prevented to protect a built-in circuit. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cable with a sealing member provided with a sealing member that seals between a cable through hole formed in a housing of an electronic device and a cable passed through the cable through hole.

  In recent years, portable telephones (electronic devices) have been provided in various forms such as a folding type in order to further reduce the size. A foldable portable telephone 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 rotatable. When the user does not use the portable phone, the user folds the two cases around the hinge mechanism and carries the case. When using the portable phone, the user unfolds the two cases around the hinge mechanism. Then press the operation button or look at the LCD to make calls or send / receive emails.

This type of mobile phone has a housing with operation buttons, etc. and a housing with a liquid crystal display, etc., so the circuits built in both housings are electrically connected. Wiring is required. For this reason, for example, in Patent Document 1, a long through hole (cable through hole) parallel to the hinge leading to the inside and outside of the housing is formed on the side surface of each housing on the hinge mechanism side, and a flexible wiring board is formed in each through hole. (Cables) are electrically connected between the circuits built in both housings, and each through hole is sealed (sealed) with a waterproofing member (sealing member) integrated with the flexible wiring board. Is disclosed.
JP 2006-344813 A

  In the conventional flexible wiring board described above, the waterproof member is integrated by insert molding. For this reason, if positioning of the flexible wiring board in the mold for insert molding is mistaken, a part of the flexible wiring board may be exposed from the side surface of the integrated waterproofing member. The member cannot seal the through-hole of the housing, and there is a risk of short-circuiting the built-in circuit when moisture enters the housing. In order to solve such problems, it is necessary to position the flexible wiring board in the insert molding die with high accuracy, and it takes time to install the flexible wiring board in the die. As a result, the manufacturing cost increased and the productivity decreased.

  In addition, such a flexible wiring board has a flat shape without irregularities, and it is easy to integrally form a waterproof member. However, when this flexible wiring board is used, transmission and reception of high-speed, large-capacity data transmission is possible. It is sometimes affected by noise, and in order to remove the influence of such noise, it is preferable to use a flat cable composed of a plurality of shielded coaxial cables. However, this type of flat cable uses an ultra-thin coaxial cable, and the flat cable that has been flattened has an irregular shape on its outer periphery, and is integrated with a waterproofing member for sealing. It is difficult to convert.

  Furthermore, when such an ultra-thin coaxial cable is used for wiring of a mobile phone or the like, it is necessary to position and hold the coaxial cable in the mold as with the flexible wiring board. The coaxial cable itself may buckle against the flow pressure of the resin, or the coaxial cable may be disconnected, and a method of hermetically integrating with the waterproofing member with an adhesive is taken. Therefore, this method also requires a lot of labor similar to the above-described flexible wiring board, resulting in an increase in manufacturing cost and a decrease in productivity.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to reliably seal between a cable through hole formed in a housing and a cable passed through the cable through hole. It is providing the cable with a sealing member provided with the sealing member which can be performed with favorable productivity.

  In order to achieve the above object, the cable with a sealing member of the present invention includes a sealing member that seals between a cable through hole formed in the housing of the electronic device and a cable passed through the cable through hole. A sealing member main body having a main body outer peripheral portion in close contact with an inner peripheral portion of the cable through hole and a main body inner peripheral portion through which the cable is inserted; A sealing member projecting portion that protrudes from the sealing member main body and has a projecting inner peripheral portion that communicates with the inner peripheral portion of the main body and is inserted into the cable, and the cable projects from the sealing member projecting portion. It is characterized by being fused to the inner periphery.

  As a result, the cable is inserted into the protruding inner peripheral portion formed on the sealing member protruding portion of the sealing member that is molded in advance, and then the protruding inner peripheral portion and the cable outer shell are fused, so that the sealing member main body In addition, it is possible to suppress the influence of deformation due to heat at the time of fusion, and the sealing member body can maintain a highly accurate shape. As a result, a part of the cable is not exposed from the side surface of the sealing member as in the conventional case, and the cable passing through the cable passing hole formed in the housing and the cable passing through the cable passing hole are surely secured. The internal circuit can be protected by preventing the ingress of moisture into the housing.

  Further, the sealing member protrusion has a side wall having an R shape. Further, the sealing member protrusion has a notch on the side wall. As a result, the side surface of the protruding portion of the sealing member can be more easily bent, so that the semi-molten upper and lower inner surfaces of the protruding inner peripheral portion of the protruding portion of the sealing member can be easily and reliably fused to the upper and lower surfaces of the outer cover of the cable. The airtightness between the cable and the sealing member can be further improved. Further, at least the outer peripheral portion of the main body of the sealing member main body is formed of a softer resin than the inner peripheral portion of the cable through hole. As a result, the outer peripheral part of the main body of the sealing member main body can be deformed and can be brought into close contact with the inner peripheral part of the cable through hole. It can be surely sealed. Further, at least the sealing member protrusion is formed of a resin having a composition similar to that of the outer sheath of the cable. Accordingly, the degree of fusion between the sealing member protrusion and the cable outer sheath can be increased, so that the gap between the sealing member protrusion and the cable outer sheath can be reliably sealed. And by combining the characteristics of reliably sealing between the outer peripheral part of the main body of the sealing member main body and the inner peripheral part of the cable through hole of the housing and between the sealing member protruding part and the outer sheath of the cable This prevents moisture from entering the housing and protects the built-in circuit.

  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. 1A is a perspective view showing a sealing member used for a cable with a sealing member according to the first embodiment of the present invention, and FIG. 1B is a perspective view showing the cable with a sealing member. It is. FIG. 2 is an exploded perspective view of the housing of the electronic device and a cross-sectional view illustrating a state where the cable with the sealing member is attached to the housing of the electronic device. FIG. 3 is a view showing a manufacturing method for fusing the sealing member to the flat cable. As shown in FIG. 1B, the cable 1 with the sealing member has a configuration in which the sealing member 10 is integrated with the flat cable 20.

  As shown in FIG. 1A, the sealing member 10 includes a sealing member main body 11 and a sealing member protruding portion 12 integrated with the sealing member main body 11. The sealing member main body 11 is formed in a cylindrical body having an oval cross section, and a semicircle in which a sealing member 13 (see FIG. 1B) is fitted over the entire circumference in the substantially axial center of the outer periphery. A groove 11a having a cross section having a shape is formed. The sealing member protrusion 12 has an outer diameter (long diameter and short diameter) smaller than the outer diameter (long diameter and short diameter) of the sealing member main body 11 and the inner diameter (long diameter and short diameter) of the sealing member main body 11. It is formed in a cylindrical body having an oval cross section having the same inner diameter (major axis and minor axis). Although the sealing member main body 11 is not deformed by the heating at the time of fusion described later, the cylindrical member of the sealing member protruding portion 12 is thinner than the sealing member main body 11 so as to be easily melted. Is formed. And the sealing member protrusion part 12 protrudes from the end surface of the sealing member main body 11 so that the protrusion inner peripheral part 12b and the main body inner peripheral part 11b of the sealing member main body 11 may be connected.

  As shown in FIG. 1B, the flat cable 20 has a configuration in which a plurality of (three in this example) coaxial cables 21 are arranged in parallel and integrated. In the coaxial cable 21, a dielectric layer 23 made of an insulating material is formed around a central conductor 22 formed by twisting one conductor or a plurality of conductors, and an outer conductor is formed on the outer periphery of the dielectric layer 23. 24 is formed, and an outer sheath 25 is formed on the outer periphery of the outer conductor 24.

  The main body inner peripheral portion 11 b of the sealing member main body 11 and the protruding inner peripheral portion 12 b of the sealing member protruding portion 12 are formed so that the major axis and minor axis are slightly larger than the width and thickness of the flat cable 20. The flat cable 20 is inserted through the inner peripheral portion 11b and the protruding inner peripheral portion 12b, and the outer cover 25 is fused and integrated at the protruding inner peripheral portion 12b. Thereby, the sealing performance between the sealing member 10 and the flat cable 20 is maintained.

  A sealing member 13 such as an O-ring (a main body outer peripheral portion of the sealing member main body 11) is fitted into the groove 11a of the sealing member main body 11. As shown in FIG. 2, the sealing member main body 11 into which the sealing member 13 is fitted is fitted into a cable through hole 33 provided in a lower lid 32 that constitutes a housing 30 of the electronic device. Since the cable passage hole 33 is formed to be slightly smaller than the outer shape of the seal member 13 fitted in the sealing member main body 11, the seal member 13 is pressed by the inner peripheral portion 33 a of the cable passage hole 33. Here, the seal member 13 is formed of a softer resin than the lower lid 32 (the inner peripheral portion 33a of the cable through hole 33). For this reason, the sealing member 13 is slightly crushed by the compressive force of the inner peripheral portion 33 a of the cable passing hole 33, and the outer periphery thereof is in close contact with the inner peripheral portion 33 a of the cable passing hole 33. Thereby, the sealing performance between the sealing member 10 and the cable through hole 33 of the housing 30 is maintained. The sealing member 10 is formed so that the outer opening edge 31a on the upper lid 31 side protrudes to prevent the casing 30 from coming out of the housing 30, and the inner opening edge 32a on the lower lid 32 side protrudes. In this way, entry into the housing 30 is prevented. Further, the upper lid 31 and the lower lid 32 constituting the housing 30 of the electronic device are joined via a seal member 32c fitted in a groove 32b formed on a joint surface with the upper lid 31 of the lower lid 32. Thereby, the sealing property between the upper lid 31 and the lower lid 32 of the housing 30 is maintained.

  In addition, the convex part (main body outer peripheral part of the sealing member main body 11) which has a semicircular cross section instead of the groove 11a is used as a sealing member, and is integrally formed over the entire circumference in the substantially axial center of the outer periphery of the sealing member main body 11. May be. Thereby, the number of parts can be reduced. The sealing member main body 11 including the convex portion at this time is formed of a softer resin than the upper lid 31 and the lower lid 32 (the inner peripheral portion 33a of the cable through hole 33), and is compressed by the upper lid 31 and the lower lid 32. The convex portion is slightly crushed by the force, and the outer periphery thereof is in close contact with the inner peripheral portion 33 a of the cable passage hole 33. Also by this, the sealing performance between the sealing member 10 and the cable through hole 33 of the housing 30 can be maintained. In addition, a flange portion that prevents the sealing member protruding portion 12 from coming off from the housing 30 may be integrally formed.

  A method for manufacturing the cable 1 with the sealing member having the above configuration will be described. First, the sealing member 10 is manufactured by, for example, injection molding, and the flat cable 20 is manufactured by, for example, extrusion molding. As a material of the sealing member 10, for example, a modified ETFE (ethylene-tetrafluoroethylene copolymer) having adhesiveness which is a kind of fluororesin (trade name: NEOFLON EFEP, RP-4020, manufactured by Daikin) (melting point: 155 ° C to 170 ° C). As a material of the center conductor 22 of the flat cable 20, for example, a silver-plated annealed copper wire is used. As a material for the dielectric layer 23, for example, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA) (melting point: 300 ° C.) is used. As a material of the jacket 25, for example, ethylene-tetrafluoroethylene copolymer (ETFE) (melting point: 260 ° C.) is used.

  Next, as shown in FIG. 3, a seal member 13 such as an O-ring is fitted into the groove 11 a of the manufactured sealing member 10. On the other hand, the outer sheath 25, the outer conductor 24 and the dielectric layer 23 on one end side of the manufactured flat cable 20 are removed, and the connector 2 is soldered to one end of the center conductor 22. Then, the flat cable 20 is inserted into the protruding inner peripheral portion 12b of the sealing member 10 from the other end side, and further inserted into the main body inner peripheral portion 11b and pulled out to the outside.

  When the sealing member 10 is positioned at a predetermined position of the flat cable 20 that is separated from the connector 2 by a predetermined distance, the sealing member 10 is set in a heating device 40 such as an impulse heater so that only the sealing member protrusion 12 of the sealing member 10 is heated. . That is, for example, a polyimide film 42 serving as a release material is placed on the base 41 of the heating device 40, and only the sealing member protrusion 12 of the sealing member 10 is placed on the film 42, and the sealing is further performed. A polyimide film 43 serving as a release material is placed on the stop member protrusion 12. Then, the heating part 44 is pressed from above the film 43 to heat the sealing member protrusion 12 so as to have a melting point or higher.

  Here, the side surface shape of the sealing member protrusion 12 in the direction orthogonal to the pressing direction of the heating unit 44 is a semicircular shape (R shape) as shown in FIG. The side surface 12a is easily bent by the pressing force. For this reason, first, the semi-molten upper and lower inner surfaces of the projecting inner peripheral portion 12b of the sealing member projecting portion 12 are fused to the upper and lower surfaces of the outer skin 25 of the flat cable 20, and then the molten constituting the sealing member projecting portion 12 The resin flows into the side surface and the gap of the flat cable 20 and is fused to the outer skin 25. At this time, as described above, modified ETFE is selected as the material of the sealing member protrusion 12 and ETFE close to the composition of the modified ETFE is selected as the material of the outer shell 25. Therefore, the sealing member protrusion 12 and the outer skin 25 are selected. The degree of fusion with 25 can be increased, and the gap between the sealing member protrusion 12 and the outer skin 25 can be reliably sealed.

  In addition, as shown in the modification of the sealing member 10 in FIG. 4, by placing one or more slits 12 c extending in the axial direction on both side surfaces 12 a of the sealing member protrusion 12, the side surfaces 12 a Further, the upper and lower inner surfaces of the projecting inner peripheral portion 12b of the sealing member projecting portion 12 can be easily and reliably fused to the upper and lower surfaces of the outer skin 25 of the flat cable 20. 20 and the sealing member 10 can be further improved in airtightness. In addition, a vibration unit is incorporated in advance in, for example, the base 41 of the heating device 40, and when the sealing member protrusion 12 is heated by the heating unit 44, the sealing member protrusion 12 is vibrated by the vibration unit. In addition, the molten resin constituting the sealing member protruding portion 12 can be easily and reliably allowed to flow around the flat cable 20, and the airtightness between the flat cable 20 and the sealing member 10 can be further improved.

  FIG. 5 is a perspective view showing a cable with a sealing member according to the second embodiment of the present invention corresponding to FIG. 1B, and the same components are denoted by the same reference numerals and detailed description thereof is omitted. To do. The cable 2 with a sealing member has a configuration in which the cables 1 with a sealing member shown in FIG. The sealing member 50 includes a sealing member main body 51 and a sealing member protrusion 52 integrated with the sealing member main body 51. A groove 51a having a semicircular cross section into which the seal member 53 is fitted is formed over the entire circumference in the substantially axial center of the outer periphery of the sealing member main body 51. The sealing member protruding portion 52 is formed to protrude from one end surface of the sealing member main body 51 so that the protruding inner peripheral portion 52b and the main body inner peripheral portion 51b of the sealing member main body 51 communicate with each other.

  In this way, by forming the protruding inner peripheral portion 52b having a two-stage (multiple-stage) configuration, it is possible to divide and pass through the flat cable 20 in which the parallel number of the coaxial cables 21 is reduced. Can be reduced in accordance with the width of the flat cable 20, which is particularly effective when the width of the cable through hole 33 is limited by the component layout in the housing 30.

  In the above-described embodiment, the flat cable in which a plurality of coaxial cables are arranged in a row has been described. However, a flat cable in which a plurality of cables other than the coaxial cable are arranged in a row, a plurality of coaxial cables, and the like are circular. Even a cable bundled together can be similarly applied. Moreover, although the sealing member protrusion part 12 was formed only in the one end surface side of the sealing member main body 11, you may form in each both end surface side. Moreover, although ETFE was used as the material of the jacket 25, even if it is PFA, it can be used, although a melt | fusion property falls somewhat.

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

(A) is a perspective view which shows the sealing member used for the cable with a sealing member which concerns on the 1st Embodiment of this invention, (B) is a perspective view which shows the cable with a sealing member. It is sectional drawing which shows the state which attached the exploded perspective view of the housing | casing of an electronic device, and the cable with a sealing member to the housing | casing of an electronic device. It is a figure which shows the manufacturing method which melt | fuses a sealing member to a flat cable. It is a perspective view which shows the modification of the cable with a sealing member of FIG. It is a perspective view which shows the cable with a sealing member which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

1, 2, cable with sealing member, 10, 50 sealing member, 11, 51 sealing member body,
11a, 51a groove, 11b, 51b body periphery, 12, 52 sealing member protrusion,
12a Sealing member protruding portion side surface, 12b, 52b protruding inner peripheral portion, 12c slit,
13, 53 Seal member (outer peripheral part of main body), 20 flat cable,
21 coaxial cable, 22 central conductor, 23 dielectric layer, 24 outer conductor,
25 outer skin, 30 housing, 33 cable hole,
33a Cable through hole inner periphery, 40 heating device

Claims (5)

A cable with a sealing member provided with a sealing member for sealing between a cable through hole formed in a housing of an electronic device and a cable passed through the cable through hole,
The sealing member includes a main body outer peripheral portion that is in close contact with an inner peripheral portion of the cable through hole, and a main body inner peripheral portion through which the cable is inserted, and a main body that protrudes from the sealing member main body. A sealing member protruding portion having a protruding inner peripheral portion that communicates with the inner peripheral portion and through which the cable is inserted;
The cable with a sealing member, wherein the cable is fused to a protruding inner peripheral portion of the protruding portion of the sealing member. The cable with a sealing member according to claim 1, wherein the protruding portion of the sealing member has an R-shaped side wall. The said sealing member protrusion part has a notch part in a side wall, The cable with a sealing member of Claim 1 or 2 characterized by the above-mentioned. The sealing according to any one of claims 1 to 3, wherein at least an outer peripheral part of the main body of the sealing member body is formed of a softer resin than an inner peripheral part of the cable through hole. Cable with members. The cable with a sealing member according to claim 4, wherein at least the protruding portion of the sealing member is formed of a resin having a composition similar to that of the outer sheath of the cable.

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