JP5494213B2 - Photoelectric composite cable - Google Patents

Description

  The present invention relates to a photoelectric composite cable having an electric wire and an optical fiber.

  An optical DVI cable according to a DVI (Digital Visual Interface) transmission interface standard is used as a cable for connecting between electronic devices, for example, between a projector and a personal computer or between a display such as a plasma display and a tuner.

  The optical DVI cable includes an optical / electrical composite cable having a plurality of optical fibers, a plurality of metal wires, a tensile strength fiber, and a jacket that wraps them, and the optical fiber is connected at the end of the optical / electrical composite cable. It is known that a wire is wired to a ferrule and held together, and a metal wire is wired and connected to a metal contact (see, for example, Patent Document 1).

JP 2007-25272 A

  In the above-mentioned optoelectric composite cable, the space for connecting the optical fiber to the ferrule and the space for connecting the metal wire to the metal contact are divided by a partition wall, but in order to reduce the size of these connection parts, the partition wall Is preferably not provided. However, in that case, there is a possibility that the metal wire directly contacts the optical fiber at the place where the optical fiber and the metal wire are connected to the ferrule and the metal contact. In addition, even during the optical fiber and metal wire wiring work, the metal wire or tool may directly contact the optical fiber. When the metal wire or the like directly contacts the optical fiber in this way, the optical fiber may be damaged or the transmission loss of the optical fiber may be increased.

  An object of the present invention is to provide a highly reliable optical / electrical composite cable capable of preventing defects caused by direct contact of an electric wire with an optical fiber at a wiring location to a connection portion and maintaining good transmission characteristics of the optical fiber. There is to do.

The optoelectric composite cable of the present invention capable of solving the above problems is an optoelectric composite cable in which an optical fiber and an electric wire are covered with an outer sheath,
The optical fiber and the electric wire are exposed from the outer casing in a casing and each has a connecting portion to be connected,
The optical fiber and the electric wire are arranged in the same space in the housing where the wiring portion wired to the connection portion is arranged,
The optical fiber is characterized in that the wiring portion is covered with a tube at least in the space.

  In the optical / electrical composite cable of the present invention, it is preferable that a connection portion of the electric wire connected to the connection portion and a wiring portion covered by the tube of the optical fiber are integrally resin-molded.

  According to the optoelectric composite cable of the present invention, since the optical fiber is covered with the tube at the wiring location of the optical fiber and the electric wire arranged in the same space, the electric wire is prevented from directly contacting the optical fiber. be able to. Moreover, it is possible to prevent the electric wire or the tool from coming into direct contact with the optical fiber at the wiring location even during the wiring work for connecting the electric wire to the connecting portion. As a result, damage to the optical fiber and increase in transmission loss can be prevented, and good transmission characteristics can be maintained.

It is sectional drawing in the connection part which shows the example of embodiment of the photoelectric composite cable which concerns on this invention. It is sectional drawing which shows the internal structure of the cable of FIG.

Hereinafter, an example of an embodiment of an optoelectric composite cable according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the photoelectric composite cable 11 has a connector 1 connected to an adapter (not shown) such as an electronic device at its end. The connector 1 includes a housing (housing) 2 and a connector portion 3 protruding from the tip of the housing 2, and the connector portion 3 is inserted into an adapter.
The optoelectric composite cable 11 is an interface cable that is used to connect, for example, a personal computer and various electronic devices, and transmits optical signals and electrical signals to and from these devices.

  The connector part 3 has an electrical connector part 4 and an optical connector part 5. The electrical connector portion 4 includes a terminal portion (connecting portion) 6, and the conductor of the electric wire 15 is connected to the rear end of the terminal portion 6. The optical connector portion 5 has a ferrule (connection portion) 7, and an optical fiber core wire (optical fiber) 12 is inserted and connected to the ferrule 7 from the rear end side. The ferrule 7 has a fiber insertion hole (not shown) formed from the rear end side to the front end, and the optical fiber core wire 12 is inserted into the fiber insertion hole and held.

  The ferrule 7 is made of a transparent hard resin, and a convex lens portion 7a is formed at the tip. When signal light is emitted from the optical fiber core wire 12, the signal light is irradiated and transmitted from the convex lens portion 7a to the light receiving portion on the adapter side, and when signal light is irradiated from the adapter side, the signal light is The light enters the optical fiber core wire 12 through the convex lens portion 7a.

  As shown in FIG. 2, the optical / electrical composite cable 11 having the connector 1 includes an optical fiber core (optical fiber) 12 and a plurality of electric wires 15 inside an outer jacket 20 that is an outermost layer. One or a plurality of optical fiber core wires 12 are provided, and are accommodated in a protective tube 13 disposed at the center of the cross section of the photoelectric composite cable 11.

  The inner side of the outer sheath 20 and the outer side of the protective tube 13 is a housing portion 14, and for example, a plurality of electric wires 15 and a plurality of tensile strength wires 16 are arranged in the housing portion 14. The electric wire 15 is, for example, a twisted pair cable, a coaxial cable, or an insulated cable, and is, for example, a cable of about AWG 20 to 46 according to the AWG (American Wire Gauge) standard. In this example, two of the four electric wires 15 are signal lines, and two are power lines. In addition, a presser winding 18, a shield layer 19, and a jacket 20 are sequentially provided around the housing portion 14. In this photoelectric composite cable 11, the electric wire 15 and the tensile wire 16 accommodated in the accommodating portion 14 are loosely twisted around the protective tube 13 so as not to tighten the protective tube 13.

  The optical fiber core 12 accommodated in the protective tube 13 is obtained by forming a coating layer made of an ultraviolet curable resin around a glass fiber having a diameter of 0.125 mm made of a core and a cladding, and the outer diameter of the coating layer. Is 0.25 mm. Furthermore, a coating layer may be further provided to form an optical fiber core wire 12 having an outer diameter of 0.9 mm, or an optical fiber cord in which the optical fiber core wire 12 is further covered with a tensile fiber and a coating layer.

  In addition, as the optical fiber core wire 12, it is preferable to use a hard plastic clad fiber (H-PCF) whose clad is made of a high-hardness plastic and is strong against bending (kink) and hardly broken. Further, the core and the clad may be made of plastic.

  The protective tube 13 is made of a fluororesin excellent in non-adhesiveness, self-lubricating property, and wear resistance. For example, polytetrafluoroethylene (PTFE) resin or tetrafluoroethylene-ethylene copolymer (ETFE) resin excellent in corrosion resistance is preferably used as the fluorine resin forming the protective tube 13. The outer diameter of the protective tube 13 is, for example, 1.0 mm.

  The electric wire 15 made of a signal line has, for example, a conductor having an outer diameter of 0.30 mm formed by twisting seven strands having an outer diameter of 0.1 mm made of an annealed copper wire or copper alloy wire plated with tin. . Then, the conductor 15 is covered with an insulating sheath having a thickness of 0.14 mm, thereby forming the electric wire 15 having an outer diameter of 0.58 mm. Moreover, the electric wire 15 made of a power line has a conductor having an outer diameter of 0.38 mm formed by twisting seven strands of an outer diameter of 0.127 mm made of a tinned annealed copper wire or a copper alloy wire, for example. Yes. Then, by covering this conductor with an insulation having a thickness of 0.1 mm, the electric wire 15 has an outer diameter of 0.58 mm. As a material for the outer sheath of the electric wire 15, polytetrafluoroethylene (PFA) resin excellent in heat resistance, chemical resistance, non-adhesiveness, self-lubricating property, etc. is used for both signal lines and power lines. preferable.

  As the presser winding 18, a resin tape formed from a polyethylene terephthalate (PET) resin having excellent heat resistance and wear resistance is used. The inner diameter of the portion provided with the presser winding 18 is, for example, 2.2 mm. The shield layer 19 is formed by braiding a tin-plated copper alloy wire having an outer diameter of 0.04 mm, for example. The jacket 20 is made of, for example, a flame retardant polyethylene resin or the like, and has a thickness of 0.25 mm and an outer diameter of 3.0 mm.

  As shown in FIG. 1, in the housing 2, the optical fiber core wire 12 is exposed from the outer sheath 20 and inserted into the ferrule 7 of the connector portion 3, and the electric wire 15 is exposed from the outer sheath 20 and is connected to the connector portion 3. Is wired to the terminal portion 6. The respective wiring locations 12a and 15a of the optical fiber core wire 12 and the electric wire 15 are the same space formed between the end portion of the jacket 20 in the housing 2 and the end plate 2a on the rear end side of the connector portion 3. S is arranged.

  As for the wiring location 12a of the optical fiber core wire 12, at least a portion disposed in the space S is covered with a wiring portion protection tube (tube) 21. A part of the protective tube 13 that covers the optical fiber core wire 12 in the jacket 20 can be used as the wiring portion protective tube 21 that covers the optical fiber core wire 12 in the wiring portion 12 a. For example, the wiring part protection tube 21 is provided by extending the protection tube 13 to the end side to a position covering the wiring part 12 a of the optical fiber core wire 12. In addition, when the optical fiber core wire 12 is subjected to terminal processing, the cutting position of the protection tube 13 is set to the ferrule 7 side, and the protection tube 13 is left in the wiring portion 12a of the optical fiber core wire 12, thereby providing the wiring portion protection tube 21. May be. A short wiring portion protection tube 21 different from the protection tube 13 may be attached to the end portion of the optical fiber core wire 12 connected to the ferrule 7 from the distal end side.

  The connection location A with the terminal portion 6 of the electric wire 15 arranged in the same space S and the wiring location 12a covered with the wiring portion protection tube 21 of the optical fiber core wire 12 are molded and integrated with the resin 22. .

  Thus, according to the optical / electrical composite cable 11 according to the above-described embodiment, the optical fiber core wire 12 is connected to the wiring portion at the wiring portions 12a and 15a of the optical fiber core wire 12 and the electric wire 15 arranged in the same space S. Since it is covered with the protective tube 21, it is possible to prevent the electric wire 15 from directly contacting the optical fiber core wire 12. Moreover, it is possible to prevent the electric wire 15 and the tool from coming into direct contact with the optical fiber core wire 12 at the wiring location 12a even during wiring work in which the electric wire 15 is soldered and connected to the terminal portion 6.

In addition, when the space S is filled with the resin 22 and molded, the resin 22 can be prevented from directly contacting and damaging the optical fiber core wire 12.
As a result, damage to the optical fiber core 12 due to the wires 15 and the like coming into contact with the optical fiber core 12 and an increase in transmission loss can be prevented, and a highly reliable photoelectric composite that maintains good transmission characteristics. The cable 11 can be used.

  Further, the connection location A with the terminal portion 6 of the electric wire 15 arranged in the same space S and the wiring location 12a covered with the wiring portion protection tube 21 of the optical fiber core wire 12 are molded and integrated with the resin 22. . Thereby, the wiring location 12 a of the optical fiber core wire 12 protected by the wiring portion protection tube 21 can be further protected by the resin 22. Further, the connection portion A with the terminal portion 6 of the electric wire 15 can also be protected by the resin 22.

  This prevents the external force from acting on the connection location A of the optical fiber core wire 12 to the wiring location 12a and the terminal portion 6 of the electric wire 15, and provides good transmission characteristics of the optical fiber core wire 12 and the connection location A of the electric wire 15. High connection reliability can be ensured.

  Further, the optical fiber core wire 12 can move somewhat in the axial direction within the wiring portion protection tube 21. Therefore, even if the optical fiber core wire 12 is displaced in the longitudinal direction by a springback of the optical fiber core wire 12, the electric wire 15, or the jacket 20, the displacement can be allowed in the wiring portion protection tube 21. As a result, the action of excessive tension on the optical fiber core 12 due to springback or the like can be prevented, and damage to the optical fiber core 12 due to the action of excessive tension or an increase in transmission loss can be prevented.

  In the above embodiment, the optical / electrical composite cable 11 having the connector 1 to which the optical fiber core wire 12 and the electric wire 15 are connected at the end has been illustrated and described. For example, an electrical connector is provided at the end, What provided the relay part which has an optical module in the position away from the electrical connector may be used.

  In the photoelectric composite cable, the optical fiber core wire 12 is connected to the ferrule of the optical module in the relay unit. Moreover, the electric wire 15 is connected to the board | substrate in a relay part, or passes through a relay part and is directly connected to an electrical connector. In the optical / electrical composite cable having the relay portion, the wiring portion 12a of the optical fiber core wire 12 wired to the ferrule and the wiring portion 15a of the electric wire 15 wired to the electric connector or the substrate in the relay portion are the same in the relay portion. Arranged in the space S. In this photoelectric composite cable, the optical fiber core wire 12 has a structure in which the wiring portion 12a is covered with the wiring portion protection tube 21 in at least the space S in the relay portion.

In the above embodiment, a multi-core type in which a plurality (two) of optical fiber cores 12 are accommodated in the protective tube 13 has been described. However, one optical fiber core 12 is accommodated in the protective tube 13. A single core type may be used.
Further, the numbers of the electric wires 15 and the tensile strength wires 16 are not limited to the above embodiment. Further, only the electric wire 15 may be arranged in the accommodating portion 14.

DESCRIPTION OF SYMBOLS 1: Connector, 2: Housing (housing | casing), 6: Terminal part (connection part), 7: Ferrule (connection part), 11: Photoelectric composite cable, 12: Optical fiber core wire (optical fiber), 12a, 15a : Wiring location, 15: electric wire, 17: jacket, 21: wiring portion protection tube (tube), 22: resin, A: connection location, S: space

Claims (2)

An optical / electrical composite cable in which an optical fiber and an electric wire are covered with a jacket,
The optical fiber and the electric wire are exposed from the outer casing in a casing and each has a connecting portion to be connected,
The optical fiber and the electric wire are arranged in the same space in the housing where the wiring portion wired to the connection portion is arranged,
An optical / electrical composite cable, wherein the optical fiber has at least the wiring portion covered with a tube in the space. The photoelectric composite cable according to claim 1,
A photoelectric composite cable, wherein a connection portion of the electric wire with the connection portion and a wiring portion covered with the tube of the optical fiber are integrally molded with a resin.

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