JP5224393B2 - Optical wiring method - Google Patents

Description

The present invention relates to an optical wiring how.

With the recent FTTH conversion, the necessity of optical wiring for connecting an optical fiber in an optical fiber cable installed outdoors and an indoor wiring is increasing.
In buildings where optical wiring piping that assumes optical wiring is not provided, use air gaps such as air conditioning ducts, or make holes in the walls and provide optical wiring piping. Etc. are performed.

  Also, if there is no air conditioner duct or if it is difficult to make a hole in a rental housing, etc., wire it through a flat optical cord in the gap between the window door and the window frame. Has been proposed (see, for example, Patent Document 1).

  By the way, when the optical cord is passed through the gap between the window and the window frame, the optical cord is bent with a small diameter due to the unevenness of the window frame, and the optical fiber mainly composed of a glass material may be broken. In order to solve this, an optical cord in which an optical fiber is obliquely arranged in a two-dimensional plane and an optical cord in which an optical fiber is arranged in a wave shape in an exterior have been proposed (for example, Patent Document 2). 3).

JP 2007-147754 A JP 2007-316404 A JP 2008-304557 A

  However, when an optical cord having optical fiber strands arranged obliquely in a two-dimensional plane is used, there is a problem that the width of the optical cord becomes large. In addition, when using an optical cord in which optical fibers are arranged in a corrugated form in the exterior, the optical cord must be designed so that the corrugated peaks and valleys are located at the bends of the concave and convex portions of the window frame. There is a problem that wiring is difficult.

An object of the present invention is to provide an optical wiring how that can be done easily optical wiring according to the shape of the window frame.

To solve the above problems, the invention according to claim 1, the optical fiber cable is processed into coils form, an optical wiring how to wiring and along the unevenness of the window frame,
The cable outer diameter d of the optical fiber cable, the winding diameter D after wiring, and the height H of the unevenness of the window frame are in a relationship represented by the following formula (1).
(H + d) ≦ D ≦ H + 3d (1)

The invention according to claim 2 is the optical wiring method according to claim 1 , wherein the optical fiber cable processed into the coil shape is wound in a coil shape with a plurality of different winding diameters. .

The invention according to claim 3 is the optical wiring method according to claim 1 or 2 , wherein a connector is connected to one or both ends of the optical fiber cable.

  According to the present invention, it is not necessary to create an optical fiber cable according to the shape and size of the window frame, and optical wiring can be easily performed.

It is a figure showing optical fiber cable 1A concerning an embodiment of the present invention. It is II-II arrow sectional drawing of FIG. 2 is a perspective view showing a state in which an optical fiber cable 1A is wired to a window frame 50. FIG. It is a perspective view which shows the state which closed the window frame 50 and the door 60 of the window. It is a VV arrow sectional view of Drawing 4. It is a figure showing optical fiber cable 1B concerning an embodiment of the present invention. It is sectional drawing which shows the optical fiber cable 1C of another shape.

  FIG. 1 is a view showing an optical fiber cable 1A according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line II-II in FIG. The optical fiber cable 1 </ b> A is processed into a coil shape, and is roughly configured by an optical fiber core wire 10, a tension member 20, and a sheath 30.

The optical fiber core 10 is formed by coating an optical fiber 11 with a covering material 12. For the optical fiber 11, for example, a quartz glass optical fiber having a core and a clad coated with an ultraviolet curable resin or the like can be used. Moreover, you may use the hole assist optical fiber (HAF) which has arrange | positioned several hole around the core as an optical fiber strand. HAF has the characteristic of low bending loss.
For the covering material 12, for example, an ultraviolet curable resin or the like can be used.

  The tension member 20 bears the tension acting on the optical fiber cable 1A. For example, a metal wire or an aramid fiber can be used for the tension member 20. In FIG. 2, three tension members 20 are arranged around the optical fiber core wire 10, but the number thereof is arbitrary.

  The sheath 30 collectively covers the optical fiber core wire 10 and the tension member 20. For the sheath 30, for example, a thermoplastic resin such as a flame-retardant polyolefin can be used.

Next, an optical wiring method for wiring the optical fiber cable 1A between the window door and the window frame will be described. 3 is a perspective view showing a state in which the optical fiber cable 1A is wired to the window frame 50, FIG. 4 is a perspective view showing a state in which the window frame 50 and the window door 60 are closed, and FIG. It is a VV arrow directional cross-sectional view. As shown in FIGS. 3 to 5, the window frame 50 is provided with three ridges 51, 52, 53, and a groove 54 is provided between the ridges 51, 52, and between the ridges 52, 53. Each groove 55 is formed. As shown in FIGS. 4 and 5, protrusions 61 and 62 are provided on the window door 60, and a groove 63 is provided between the protrusions 61 and 62.
When the window door 60 is closed, the ridges 61 and 62 enter the grooves 54 and 55, and the ridge 52 enters the groove 63.
As shown in FIG. 5, the window frame 50 and the window door 60 are provided with dampers 56 and 66 for absorbing impact, respectively.

  In the present embodiment, as shown in FIG. 3, the coiled optical fiber cable 1 </ b> A is arranged so that one turn is taken from the protrusion 51 to the protrusion 52 and one turn is taken from the protrusion 52 to the protrusion 53. Deploy. Then, as shown in FIGS. 4 and 5, the optical fiber cable 1 </ b> A fits in the gap between the window frame 50 and the window door 60 with the window door 60 closed. Since the optical fiber cable 1A has a coil shape, the optical fiber cable 1A is disposed obliquely with respect to the ridges 51, 52, 53, 61, 62 as shown in FIGS.

If the optical fiber cable 1A is arranged so as to be orthogonal to the ridges 51, 52, 53, 61, 62, the light is transmitted along the ridges 51, 52, 53, 61, 62 with a small bending radius. It is necessary to bend the fiber cable 1A.
On the other hand, in this embodiment, an optical fiber cable wound in a coil shape is disposed, and the optical fiber cable 1 crosses the protrusions 51, 52, 53 of the window frame obliquely. For this reason, since the bending diameter becomes the winding diameter of the coil, the bending diameter can be further increased, and the bending loss of the optical fiber 11 can be reduced. In addition, the probability of breakage of the optical fiber 11 is reduced.
As described above, by using the coiled optical fiber cable 1, wiring can be performed without being constrained by the uneven shape of the window frame 50.

Here, the height of the ridges 51, 52, 53 is H (see FIG. 3), the winding diameter of the optical fiber cable 1A wired along the window frame 50 is D (see FIG. 5), and the outer diameter is d (see FIG. 3). 2), it is preferable that the following expression (1) is satisfied in each of the convex portions of all the window frames.
H + d ≦ D ≦ H + 3d (1)
Here, the winding diameter D is a diameter on the outer peripheral side of the wired coiled optical fiber cable at a position crossing the convex portion of the window frame. The winding diameter with respect to the height H1 shown in FIG. 5 is D1, and the winding diameter with respect to H2 is D2.

  In the case of D <H + d, the optical fiber cable 1A does not reach the bottoms of the grooves 54 and 55, so the optical fiber cable 1A is pushed by the protrusions 61 and 62 that enter the grooves 54 and 55, and the sheath 30 is damaged. There is a fear. On the other hand, in the case of H + 3d <D, the optical fiber cable 1A is arranged in a state of being lifted from the ridges 51, 52, 53. Therefore, when the ridge 52 is inserted into the groove 63, the optical fiber cable 1A is The sheath 30 may move and damage the sheath 30.

  The winding diameter of the optical fiber cable may not be uniform. For example, as shown in FIGS. 6A and 6B, an optical fiber cable 1B wound with a plurality of different winding diameters is used. Also good. When the heights of the ridges 51, 52, and 53 are different, as shown in FIG. 6A, the ridges 51, 52, and 53 are obtained by using an optical fiber cable 1B having a different winding diameter for each turn. Can accommodate different heights. Moreover, as shown in FIG.6 (b), the part wired to a window frame is suitably selected by the height of the protrusions 51, 52, and 53 by using the optical fiber cable 1B from which a winding diameter differs for every several turns. be able to.

Further, the cross-sectional shape of the optical fiber cable may not be circular. FIG. 7 is a cross-sectional view showing an optical fiber cable 1C having another shape. As shown in FIG. 7, the optical fiber cable 1C includes an optical fiber core wire 10, two tension members 20 disposed on both sides of the optical fiber core wire 10, an optical fiber core wire 10 and a tension member 20. It is comprised roughly from the sheath 30 coat | covered collectively. The optical fiber core wire 10 and the two tension members 20 are arranged in the long side direction in the cross section of FIG.
In the cross section of FIG. 7, a notch 31 for tearing the sheath 30 and taking out the optical fiber core wire 10 is provided at the center of the long side of the sheath 30.

  Since the optical fiber cable 1C having such a cross-sectional shape has two tension members 20, the bending direction is uniquely determined. Therefore, when the optical fiber cable 1C is coiled, d in the formula (1) has a short side length in the cross section of FIG.

Furthermore, the cross section of the optical fiber cable may be elliptical or the like in addition to circular or rectangular.
In the above embodiment, a connector may be connected to one or both ends of the optical fiber cable.
Examples of the present invention will be described below.

[Optical fiber cable]
An optical fiber core coated with an ultraviolet curable resin was prepared by coating an optical fiber strand having an outer diameter of 250 μm with a 125 μm diameter quartz glass optical fiber coated with an ultraviolet curable resin to an outer diameter of 0.5 mm. An optical fiber cable comprising three 420-dtex aramid fibers vertically attached around the optical fiber core and coated with a flame retardant polyolefin so that the outer diameter d is φ1.0 mm, φ1.1 mm, and φ1.5 mm. Produced. These optical fiber cables were formed in a coil shape.
The optical fiber cable was wired to a window frame having a height H of 10 mm or 12 mm on the unevenness of the window frame, and the door of the window was opened and closed. At that time, the presence or absence of disconnection of the optical fiber and the presence or absence of damage to the sheath were confirmed.
The wound diameter D of the optical fiber cable after wiring was φ8 mm, φ10 mm, φ11 mm, φ12 mm, φ13 mm, φ14 mm, and φ15 mm. The winding diameter D of the optical fiber cable after wiring can be adjusted by adjusting the winding diameter of the optical fiber cable before wiring. The results are shown in Table 1. In Table 1, the case where there was no disconnection of the optical fiber was marked with ◯, and the case where there was a break was marked with x. Moreover, the case where there was no damage of a sheath was set as (circle), and the case where it existed was set as x.

  As is clear from Table 1, if the relationship of the formula (1) is established by the outer diameter d and the winding diameter D of the optical fiber cable and the height H of the unevenness of the window frame, the gap between the window door and the window frame It can be seen that even if an optical fiber cable is wired and the window door is opened and closed, the optical fiber is not broken and the sheath is not affected. In the case of D <H + d, when the optical fiber cable crosses the uneven portion of the window frame, it is considered that the optical fiber cable is strongly pressed at the corner of the protrusion of the window frame and damages the sheath. Further, in the case of D> H + 3d, the optical fiber cable protruding beyond the groove of the window frame could not be fit into the gap between the window and the window frame, so that the window and the window frame damaged the optical fiber cable jacket.

As shown in FIG. 7, an embodiment using an optical fiber cable having a substantially rectangular cross section is shown. In the cross section, optical fiber cables having a short side of 1.0 mm × long side of 1.5 mm and 1.5 mm × 1.5 mm were used.
The optical fiber cable is wired in a gap between the window door and the window frame so that the winding diameter D of the optical fiber cable after wiring is φ8 mm, φ10 mm, φ11 mm, φ12 mm, φ13 mm, φ14 mm, and φ15 mm. The door was opened and closed.
At that time, the presence or absence of disconnection of the optical fiber and the presence or absence of damage to the sheath were confirmed. The height H of the unevenness of the window frame was 10 mm or 12 mm. The case where there was no disconnection of the optical fiber was marked with ◯, and the case where there was a break was marked with x. Moreover, the case where there was no damage of a sheath was set as (circle) and the case where it existed was set as x.
The results are shown in Table 2.

  As is clear from Table 2, the relationship of the formula (1) is expressed by the outer diameter d and the winding diameter D of the optical fiber cable and the height H of the unevenness of the window frame, as in the case where the cross section of the optical fiber cable is circular. If established, it can be seen that even if an optical fiber cable is routed in the gap between the window door and the window frame and the window door is opened and closed, there is no disconnection of the optical fiber and the sheath is not affected. .

In this embodiment, the most common optical fiber having an outer diameter of 250 μm is used as the optical fiber. However, for example, a thin optical fiber having an outer diameter of 70 μm to 125 μm may be used. it can.
By using such an optical fiber, for example, the outer diameter d of the optical fiber cable shown in the first embodiment can be reduced to φ0.7 mm or less, and the structure is more suitable for wiring to the window frame.

1A, 1B, 1C Optical fiber cable 10 Optical fiber core wire 11 Optical fiber strand 12 Cover material 20 Tension member 30 Sheath 31 Notch 50 Window frame 51, 52, 53, 61, 62 Projection 54, 55, 63 Groove 60 Window Door

Claims (3)

The processed fiber optic cable into a coil, an optical wiring how to wiring and along the unevenness of the window frame,
An optical wiring method, wherein the outer diameter d of the optical fiber cable, the winding diameter D after wiring, and the height H of the irregularities of the window frame are in a relationship represented by the following formula (1).
(H + d) ≦ D ≦ H + 3d (1) 2. The optical wiring method according to claim 1, wherein the optical fiber cable processed into a coil shape is wound in a coil shape with a plurality of different winding diameters. 3. The optical wiring method according to claim 1, wherein a connector is connected to one end or both ends of the optical fiber cable.

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