JP2007033791A - Optical fiber cable, and protection pipe for optical fiber cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an optical fiber cable and a protection pipe for the optical fiber cable that can be held linear and automatically restored, and stopped from being curved to exert a bad influence on an optical fiber, facilitate a wiring operation, securely prevent an accident such that the fiber is curved too much during a wiring operation to be damaged, and never damage the optical fiber even when external pressure such as lateral pressure is applied. <P>SOLUTION: The optical fiber cable comprises an optical fiber cord, a spiral tube which covers the outer peripheral part of the optical fiber cord and is spirally wound to have self-extending property, and a sheath which covers the outer peripheral part of the spiral tube. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical fiber cable and a protective tube for an optical fiber cable.

  In a conventional optical fiber cable, optical fiber cords are arranged in parallel on both sides of a tension member, and the outer peripheral portion thereof is covered with a sheath so as to form a track shape.

The optical fiber cable constructed in this way does not have the functional properties of maintaining a straight line, automatically restoring it, or correcting the bendability, and the wiring work is difficult. There was a drawback that it was easy to make.
Japanese Patent Laid-Open No. 9-243883

  In view of the above-described conventional drawbacks, the present invention can maintain a straight line, automatically restore it, or prevent bending that adversely affects an optical fiber. To provide an optical fiber cable and a protective tube for an optical fiber cable that can reliably prevent an accident caused by being bent excessively and that does not damage an optical fiber even when pressure is applied from the outside such as a side pressure. It is an object.

The above and other objects and novel features of the present invention will become more fully apparent when the following description is read in conjunction with the accompanying drawings.
However, the drawings are for explanation only and do not limit the technical scope of the present invention.

  In order to achieve the above object, the present invention provides an optical fiber cord, a spiral tube wound in a spiral shape so as to cover the outer peripheral portion of the optical fiber cord, and an outer peripheral portion of the spiral tube. An optical fiber cable is constituted by a sheath covering the.

  Further, the present invention provides an optical fiber cable that can accommodate an optical fiber cable, and includes a spiral tube wound in a spiral shape so as to have self-stretchability and a sheath that covers the outer periphery of the spiral tube. Constructs a protective tube.

  As will be apparent from the following description, the present invention has the following effects.

(1) It is composed of an optical fiber cord, a spiral tube wound in a spiral shape so as to cover the outer periphery of the optical fiber cord, and a sheath covering the outer periphery of the spiral tube. Therefore, the spiral tube and the sheath can prevent bending more than necessary.
Therefore, it is possible to prevent bending that damages the optical fiber of the optical fiber cord, and it is possible to reliably prevent an optical fiber damage accident during wiring work.

(2) According to the above (1), the straight line can be maintained or automatically restored by the spiral tube.
Therefore, wiring work can be performed more easily.

(3) According to (1), even if an external pressure is applied, it is possible to prevent the optical fiber cord from being adversely affected by the repulsive force of the spiral tube.
Therefore, it can be used safely.

(4) In claim 2, the same effects as in the above (1) to (3) can be obtained, and the spiral tube can be further reinforced.

(5) In claim 3, the same effects as in the above (1) to (3) can be obtained.

(6) In the fourth aspect, the same effects as in the above (1) to (4) can be obtained.

  Hereinafter, the present invention will be described in detail with reference to the best mode for carrying out the invention shown in the drawings.

  In the first preferred embodiment for carrying out the present invention shown in FIGS. 1 to 5, reference numeral 1 denotes an optical fiber cable of the present invention. The optical fiber cable 1 includes an optical fiber cord 2 and an optical fiber cord 2. The spiral tube 3 is wound in a spiral shape so as to cover the outer peripheral portion and has a self-stretching property, and the sheath 4 covers the outer peripheral portion of the spiral tube 3.

  As shown in FIG. 3, the optical fiber cord 2 includes an optical fiber 5, an ultraviolet curable resin layer 6 that covers the outer peripheral portion of the optical fiber 5, and a coating layer 7 that covers the outer peripheral portion of the ultraviolet curable resin layer 6. Has been.

  As shown in FIGS. 4 and 5, the spiral tube 3 is formed by winding a wire 8 having a circular cross section formed of metal or a synthetic resin material in a spiral shape so as not to generate a gap.

  The sheath 4 is made of a stretchable synthetic resin material.

In the optical fiber cable 1 having the above configuration, since the outer peripheral portion of the optical fiber cord 2 is covered with the spiral tube 3 having self-stretchability, the self-stretching of the spiral tube 3 is possible even if bending is applied in wiring work or the like. It automatically returns to the straight line state depending on the sex.
Further, the spiral tube 3 and the sheath 4 covering the outer periphery of the spiral tube 3 prevent bending more than necessary even when force is applied in the bending direction during wiring work or the like, and the optical fiber of the optical fiber cord 2 5 can be efficiently prevented, and even when external pressure is applied, the spiral tube 3 and the sheath 4 cause a repulsive force to maintain a spiral state, which adversely affects the optical fiber 5 of the optical fiber cord 2. It is also possible to efficiently prevent this.
[Different forms for carrying out the invention]

  Next, different modes for carrying out the present invention shown in FIGS. 6 to 19 will be described. In the description of these different modes for carrying out the present invention, the same components as those in the best mode for carrying out the present invention are designated by the same reference numerals and redundant description is omitted. To do.

  The second embodiment for carrying out the present invention shown in FIGS. 6 and 7 is mainly different from the best first embodiment for carrying out the present invention in that an aramid yarn is formed on the outer peripheral portion of the spiral tube 3. The optical fiber cable 1A constructed using the tensile strength fibers 9 as described above is the same as in the first preferred embodiment for carrying out the present invention. Thus, the optical fiber cord 2 can be protected more efficiently.

The third embodiment for carrying out the present invention shown in FIGS. 8 to 10 is mainly different from the second embodiment for carrying out the present invention in that a plate-like wire 8A having a quadrangular section is formed in a gap. Since the spiral tube 3A wound in a spiral shape is used so as not to occur, the optical fiber cable 1B configured using the spiral tube 3A configured in this way can be used to implement the present invention. The same effect as the second embodiment can be obtained.
In the embodiment of the present invention, the spiral tube 3A may have an elliptical shape, a square shape, a trapezoidal shape, a polygonal shape, or the like other than the rectangular plate shape.

  The fourth embodiment for carrying out the present invention shown in FIGS. 11 and 12 is mainly different from the second embodiment for carrying out the present invention in that two optical fiber cords 2 and 2 are spirally wound. The optical fiber cable 1C configured in this way may be used in that it is covered with the tube 3B.

  The fifth embodiment for carrying out the present invention shown in FIGS. 13 and 14 is mainly different from the second embodiment for carrying out the present invention in that three optical fiber cords 2, 2, 2 are used. May be an optical fiber cable 1D configured in this way in that it is covered with a spiral tube 3C.

  The sixth embodiment for carrying out the present invention shown in FIGS. 15 to 17 is mainly different from the best first embodiment for carrying out the present invention in that the optical fiber cord 2 is inserted later. The optical fiber cable protective tube 10 is formed by the spiral tube 3D and the sheath 4 so that the optical fiber cable protective tube 10 is the best for carrying out the present invention. The same effect as the first embodiment can be obtained.

The seventh embodiment for carrying out the present invention shown in FIGS. 18 and 19 is mainly different from the sixth embodiment for carrying out the present invention in that a tensile strength is provided between the spiral tube 3D and the sheath 4. The same effect as the sixth embodiment for carrying out the present invention can be obtained even if the protective tube 10A for optical fiber cable configured as above is provided with the fibers 9 vertically or braided.
In this embodiment, the diameter of the spiral tube 3D may be increased so that a plurality of optical fiber cords 2 can be inserted therein.

  In each embodiment for carrying out the present invention, a spiral tube is used in which a wire is wound in a spiral shape so as not to generate a gap. However, the present invention is not limited to this, and a slight gap is generated. Alternatively, it may be connected or integrally formed with a stretchable resin material.

  The present invention is used in the industry for manufacturing optical fiber cables and protective tubes for optical fiber cables.

1 is a partially broken perspective view of a best first embodiment for carrying out the present invention. FIG. The expanded sectional view which follows the 2-2 line of FIG. BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing of the optical fiber cord of the best 1st form for implementing this invention. Explanatory drawing of the spiral tube of the best 1st form for implementing this invention. Sectional drawing which follows the 5-5 line of FIG. The perspective view of the 2nd form for implementing this invention. The expanded sectional view which follows the 7-7 line of FIG. The perspective view of the 3rd form for carrying out the present invention. The expanded sectional view which follows the 9-9 line of FIG. Explanatory drawing of the spiral tube of the 3rd form for implementing this invention. The perspective view of the 4th form for carrying out the present invention. The expanded sectional view which follows the 12-12 line of FIG. The perspective view of the 5th form for implementing this invention. The expanded sectional view which follows the 14-14 line of FIG. The perspective view of the 6th form for implementing this invention. The expanded sectional view which follows the 16-16 line of FIG. Explanatory drawing of the use condition of the 6th form for implementing this invention. The perspective view of the 7th form for implementing this invention. The expanded sectional view which follows the 19-19 line of FIG.

Explanation of symbols

1, 1A, 1B, 1C, 1D: optical fiber cable,
2: Optical fiber cord
3, 3A, 3B, 3C, 3D: spiral tube,
4: sheath, 5: optical fiber,
6: UV curable resin layer, 7: coating layer,
8, 8A: Wire rod, 9: Tensile fiber,
10, 10A: Protection tube for optical fiber cable.

Claims (9)

An optical fiber cable comprising: an optical fiber; a spiral tube wound in a spiral shape so as to have a self-stretching property covering an outer peripheral portion of the optical fiber; and a sheath covering the spiral tube. An optical fiber, a spiral tube wound in a spiral shape so as to have self-stretchability covering the outer peripheral portion of the optical fiber, a tensile fiber that is vertically attached or braided to the outer peripheral portion of the spiral tube, and this An optical fiber cable comprising a tensile strength fiber and a sheath covering an outer peripheral portion of the spiral tube. An optical fiber, a spiral tube mainly composed of engineering plastic wound in a spiral shape covering the outer peripheral portion of the optical fiber, a tensile fiber attached or braided to the outer peripheral portion of the spiral tube, and the tensile strength An optical fiber cable comprising a fiber and a sheath covering an outer peripheral portion of the spiral tube. An optical fiber, a spiral tube mainly composed of a polycarbonate resin wound in a spiral shape covering the outer periphery of the optical fiber, a tensile fiber vertically attached or braided to the outer periphery of the spiral tube, and the tensile strength An optical fiber cable comprising a fiber and a sheath covering an outer peripheral portion of the spiral tube. An optical fiber, an optical fiber cord, and an optical fiber cable can be accommodated inside, and is composed of a spiral tube wound in a spiral shape so as to have self-extension and a sheath covering the spiral tube Protective tube for optical fiber cable. An optical fiber, an optical fiber cord, and an optical fiber cable can be accommodated inside, and a spiral tube wound in a spiral shape so as to have self-stretchability, and the outer periphery of the spiral tube is vertically attached or braided. A protective tube for an optical fiber cable, comprising: a tensile strength fiber; and a sheath covering the tensile strength fiber and an outer peripheral portion of the spiral tube. A spiral tube mainly composed of engineering plastic wound in a spiral shape that can accommodate optical fibers, optical fiber cords, and optical fiber cables, and a vertical tube or braid attached to the outer periphery of this spiral tube A protective tube for an optical fiber cable, comprising: a tensile strength fiber; a tensile strength fiber; and a sheath covering an outer peripheral portion of the spiral tube. A spiral tube mainly composed of polycarbonate resin wound in a spiral shape that can accommodate optical fibers, optical fiber cords, and optical fiber cables, and the outer periphery of the spiral tube is vertically attached or braided. A protective tube for an optical fiber cable, comprising: a tensile strength fiber; a tensile strength fiber; and a sheath covering an outer peripheral portion of the spiral tube. The optical fiber cable according to claim 4, wherein the optical fiber, the optical fiber cord, and the optical fiber cable can be simultaneously produced without inserting.

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