JP4806657B2 - Optical fiber cord - Google Patents

Description

  The present invention provides an optical fiber cord that can be installed even in a place where it is required to bend the optical fiber cord with a small bending radius when laying the optical fiber cord in a narrow area. The present invention relates to a wave type optical fiber cord corresponding to a small bending diameter.

  Conventional optical fiber cords are mainly those in which an optical fiber mainly made of a glass material is coated with a sheath. For this reason, if the optical fiber cord is bent with a small radius, the mechanical strength is greatly reduced, resulting in deterioration of long-term reliability. Therefore, the limit diameter of bending of the optical fiber cord is specified for the construction and use of the optical fiber cord, and it is stipulated that the bending diameter is larger than the limit diameter of the bending of the optical fiber cord. In order to prevent the fiber cord from being bent at a radius less than a predetermined constant value, the bend radius of the optical fiber cord is set to a certain value or more by devising hardware, for example, by setting the coating thickness to a specified radius or more Have been devised to become. Further, there has been a method of arranging a curve guide member in which the bending radius of the optical fiber cord is a certain value or more at a portion where the optical fiber cord is curved.

  Conventionally, there has been a compression-resistant cable for wiring under the floor (for example, see Non-Patent Document 1).

"Undercarpet cable: Optical cable / Metal cable: Information and communication company: Furukawa Electric", [online], Furukawa Electric catalog homepage, [February 27, 2007 search], Internet <URL: http: //www.furukawa.co .jp / optcom / optcable / under.htm>

  In the conventional method, it was necessary to secure a bend radius of a certain value or more in the optical fiber cord. Therefore, the method is limited to use and construction in a place where this space can be secured, and the space is narrow and the narrow bend where a small bend radius is required. An optical fiber cord could not be installed at the location.

  The present invention has been made in view of the above circumstances, and when the optical fiber cord is bent by arranging the optical fiber in a wave shape inside the optical fiber cord sheath, the built-in optical fiber is slanted. Can be applied to bends smaller than the bend radius required to secure the strength of the optical fiber, and the entire exterior can be reduced by arranging the optical fiber in a corrugated shape. An object of the present invention is to provide an optical fiber cord that allows the light incident side and the light emitting side to exist at the same position.

In order to achieve the above object, the present invention provides an optical fiber cord having an optical fiber built in an outer sheath , wherein a spacer having a notch in a corrugated shape is disposed in the outer sheath, and the spacer An optical fiber is arranged along the notch. As a result, the optical fiber is formed into a corrugated shape with a folded curved portion and an oblique straight portion connected to the curved portion, and the oblique straight portion is bent when the optical fiber cord is bent. It functions as a corresponding part .

  The optical fiber cord of the present invention is a bent portion in which an optical fiber is obliquely passed when the optical fiber cord is bent by arranging the optical fiber in a wave shape inside the optical fiber cord sheath. Can be applied to a bending portion smaller than the bending radius required for securing the optical fiber strength, and the entire exterior can be reduced by arranging the optical fiber in a corrugated shape. In addition, the light incident side and the light emitting side can exist at the same position, so that an optical fiber cord can be installed in a narrow space, and the options for places where high-speed optical transmission can be used can be expanded.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1A is a configuration explanatory view seen from the upper surface showing an optical fiber cord according to the first embodiment of the present invention, and is shown in perspective to explain the positions of optical fibers and the like arranged in the cord. ing. FIG.1 (b) is XX 'sectional drawing of Fig.1 (a).

  As shown in FIG. 1 (a), an optical fiber 12 is embedded in a corrugated shape in a sheath 11, and reinforcing members 13, 14 such as copper wires are disposed on both sides so as to sandwich the optical fiber 12. Is embedded and embedded. A portion of the optical fiber 12 that goes out of the outer sheath 11 is protected by a protective tube 16, and a connection connector 17 is attached to the incident end and the emission end.

  As shown in FIG. 1B, the exterior 11 is composed of a release film 18, a protective material (double-sided pressure-sensitive adhesive) 19, a spacer 20, a protective material (double-sided pressure-sensitive adhesive) 21, and a protective sheet 22. In the adhesive 19, the release film 18 is bonded to the lower surface, and the spacer 20 is bonded to the upper surface. The spacer 20 is provided with a corrugated cutout at a position where the optical fiber 12 is disposed, and the optical fiber 12 is disposed in a corrugated shape along the corrugated cutout. Further, the spacer 20 is provided with a linear notch at a position where the reinforcing members 13 and 14 are arranged, and the reinforcing members 13 and 14 are arranged linearly along the linear notch.

  The spacer 20 has a protective material (double-sided adhesive) 19 as a base, and when the optical fiber 12 and the reinforcing materials 13 and 14 are arranged in the notches of the spacer 20, the spacer 20 is bonded with the adhesive of the protective material 19 and its shape. Is fixed. Thereafter, a protective material (double-sided pressure-sensitive adhesive) 21 is bonded to the upper surface of the spacer 20, and a protective sheet 22 is bonded to the upper surface of the protective material (double-sided pressure-sensitive adhesive) 21. Thus, the optical fiber 12 is completed into an optical fiber cord sandwiched between two protective materials (double-sided adhesive) 19 and 21.

  FIG. 2A is a configuration explanatory view showing the position of the optical fiber cord according to the first embodiment of the present invention, and FIG. 2B is the use of the optical fiber cord according to the first embodiment of the present invention. It is structure explanatory drawing which shows an example. 2A and 2B, [1] to [6] represent the positions of the optical fibers 12.

  That is, when an optical fiber cord as shown in FIG. 2 (a) is wired in a place where there is a partition portion 32 perpendicular to the horizontal portion 31 as shown in FIG. 2 (b), the shape of the optical fiber 12 is Between the portions [3], [4], [5] corresponding to the small-diameter bending and the portions [1], [2], [3] and [4] arranged in the non-bending portion, [4] and [5] There is [6]. In use, the release film 18 is peeled off from the protective material (double-sided adhesive) 19 before use, and the bending-corresponding portions [3], [4], and [5] of the optical fiber 12 are the minimum-diameter bent portions K1, K2, and K3. Install to be located in After the construction, the protective sheet 22 becomes the surface of the optical fiber cord.

  In the optical fiber cord according to the first embodiment of the present invention, the size of the outer sheath 11 is reduced by arranging the optical fiber 12 at an angle corresponding to the bending directly and the curved portion having a small diameter at the non-bending portion. To do. That is, by alternately arranging the part to be arranged diagonally and the folded part, and arranging the diagonally upward part, the curved part, the diagonally downward part, the curved part, the diagonally upward part, the curved part, and the diagonally downward part, The size of the exterior 11 in the vertical direction can be reduced. In this case, long-term reliability can be maintained by making the curved portion larger than the specified bending diameter.

  As a result of investigating the use of an optical fiber cord, which is placed in a corrugated shape using a hole-assist type optical fiber and attached with SC connectors at both ends, on an aluminum sash frame to open and close the aluminum sash, With an insertion loss of 0.5 dbm, a loss fluctuation of 0.002 db at the time of construction, and a loss fluctuation of 0.001 db at the time of opening and closing, it was confirmed that the optical fiber cord can be used as an optical fiber arranged through an aluminum sash.

  As described above, the optical fiber cord according to the first embodiment of the present invention is provided with a bent portion through which the optical fiber built in the wide band-shaped optical fiber cord passes obliquely, thereby The optical fiber cord can be bent with a bending allowable radius smaller than the allowable bending radius. Therefore, it can be applied to bending parts smaller than the bending radius required to secure the strength of the optical fiber, and the optical fiber cord can be installed in a narrow space, thereby expanding the options for places where high-speed optical transmission can be used. be able to.

  Moreover, in the optical fiber cord according to the first embodiment of the present invention, the incident end and the emission end can be taken in the same direction, and the required area for arrangement can be reduced. In addition, by adopting the corrugated arrangement, the bending direction of the optical fiber can be offset.

The optical fiber built in the exterior of the optical fiber cord is arranged in a wave shape at an oblique straight portion connected to the folded curved portion, and the optical fiber cord is bent at the oblique straight portion. Good.
Other examples of wave shapes include sine waves, circular arcs, elliptical arcs, and S shapes. The two-dimensional arrangement is not limited to the wave shape, and examples of the two-dimensional arrangement include an inclined straight line, a V-type, a W-type, an N-type, and a U-type.

  FIG. 3 (a) is an explanatory diagram of the configuration of the optical fiber cord according to the second embodiment of the present invention as viewed from above, and FIG. 3 (b) is the optical fiber cord according to the second embodiment of the present invention. FIG. 3A and 3B, [1] to [9] represent the positions of the optical fibers 42.

  As shown in FIG. 3 (a), an optical fiber 42 is embedded in the outer shape 41 in a corrugated shape, and reinforcing members 43, 44 such as copper wires are provided on both sides so as to sandwich the optical fiber 42. Is embedded and embedded. In the optical fiber 42, the wave-shaped optical fiber 12 shown in FIG. 2A is disposed twice, and a linear optical fiber is interposed between the two wave-shaped optical fibers 12. The optical fiber 42 is configured by covering an optical fiber mainly made of a glass material with a reinforcing tube 46, and adapters 47 are attached to the incident end and the exit end of the optical fiber 42. As in FIG. 1B, the exterior 41 is formed by sequentially laminating a release film, a protective material (double-sided pressure-sensitive adhesive), a spacer, a protective material (double-sided pressure-sensitive adhesive), and a protective sheet. The optical fiber 42 and the reinforcing members 43 and 44 are arranged along the notch provided in the spacer of the exterior 41, and the optical fiber 42 and the reinforcing members 43 and 44 are sandwiched with two protective materials (double-sided adhesive). To complete an optical fiber cord.

  That is, when an optical fiber cord as shown in FIG. 3A is wired in a place where two vertical partitions 52 and 53 are provided in a horizontal portion 51 as shown in FIG. The shapes are the portions [3] to [8] corresponding to the minimum diameter bending, and the portions [1], [2], [3] and [4] disposed in the portions that are not bent, [4] and [5]. [5] and [6], [6] and [7], [7] and [8], and [9]. In use, the peeling film of the outer casing 41 is peeled off from the protective material (double-sided adhesive) before use, and the bending corresponding portions [3] to [8] of the optical fiber 42 correspond to the minimum-diameter bending portions K1 to K6, respectively. Install to position. After the construction, the protective sheet of the exterior 41 becomes the surface of the optical fiber cord.

  FIGS. 3A and 3B are examples of optical fiber cords corresponding to a case where there are a large number of small-diameter bent portions and various shapes. On the premise that the optical fiber arranged in the optical fiber cord is arranged in a shape along the object to be constructed, a large bend diameter is used in other places so that a hatched portion corresponds to a small-diameter bend portion. The optical fiber having a shape corresponding to a straight line is arranged in a wider portion. When this is applied, wiring as shown in FIG. 3B is obtained, and corresponding portions [3] to [8] are arranged in the small-diameter bent portions K1 to K6 to ensure reliability. Adapters are attached to both ends of the optical fiber cord to facilitate connection with connectors from other optical fiber cords.

また、光ファイバは曲げによる損失の小さいホールアシスト型光ファイバが良いが、特性が得ることができる物であれば、他のＤＳＭやＳＭ，ＰＣＦ等の光ファイバでもよい。 The corrugation of the optical fiber may be a bend with a specified diameter or more that ensures long-term reliability.
Further, the angle of the portion corresponding to the small-diameter bending of the optical fiber changes depending on the required long-term reliability. For example, when arranging beyond the top of a 2 mm board, when calculating | requiring the break probability of 10 ^<-4 > after 20 years, arrange | position an angle to 70 degree | times or more. The cumulative fracture probability F is obtained based on the formula (1).

The optical fiber is preferably a hole-assisted optical fiber with a small loss due to bending, but other optical fibers such as DSM, SM, and PCF may be used as long as the characteristics can be obtained.

In the above-described embodiment, the optical fiber uses a 250 μmφ UV core wire in order to ensure the thinness of the optical fiber cord, but can be changed to other strands / core wires. In addition, a protective tube can be used for the entire length or a cord type can be used.
Moreover, although the waveform was shown once and twice in the above embodiment, it is possible to pass even if there are a large number of small-diameter bent portions by repeatedly arranging the number of times as necessary.
Moreover, in the said embodiment, although the double-sided adhesive material was used as a protective material and the peeling film was peeled off and it was set as the form which can be constructed, the protective material which does not have an adhesive agent may be sufficient.
Moreover, although the copper wire is arrange | positioned as a reinforcing material in the said embodiment, this can also be changed into other materials (metal, plastics, etc.). When the strength of the protective sheet for the exterior is sufficient compared to the external force, or when the external force is small, the reinforcing material may not be provided.
Further, both ends of the optical fiber cord may be manufactured and used in a required shape such as directly fusion-bonding the optical fiber cord, attaching a connector, or attaching an adapter.
In addition, for example, when it is desired to lay an optical fiber cord across a room, when it is not possible to make a hole in a wall, it is conceivable to use a gap between a door and a window, but the optical fiber according to the embodiment of the present invention If it is a code, it is possible to use such a narrow space.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

(A) is the structure explanatory drawing seen from the upper surface which shows the optical fiber cord concerning the 1st Embodiment of this invention, (b) is XX 'sectional drawing of (a). (A) is structure explanatory drawing which shows the position of the optical fiber cord which concerns on the 1st Embodiment of this invention, (b) is the structure which shows the usage example of the optical fiber cord which concerns on the 1st Embodiment of this invention It is explanatory drawing. (A) is structure explanatory drawing seen from the upper surface which shows the optical fiber cord which concerns on the 2nd Embodiment of this invention, (b) is the usage example of the optical fiber cord which concerns on the 2nd Embodiment of this invention. FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Exterior, 12 ... Optical fiber, 13 ... Reinforcement material, 14 ... Reinforcement material, 16 ... Protection tube, 17 ... Connector for connection, 18 ... Release film, 19 ... Protection material (double-sided adhesive), 20 ... Spacer, 21 ... protective material (double-sided adhesive), 22 ... protective sheet.

Claims (1)

An optical fiber cord containing an optical fiber in the exterior,
A spacer provided with a notch in the shape of a corrugated shape is disposed in the exterior, and an optical fiber is disposed along the notch of the spacer,
The optical fiber is formed into a corrugated shape with a folded curved portion and an oblique straight portion connected to the curved portion, and the oblique straight portion serves as a portion corresponding to bending when the optical fiber cord is bent. An optical fiber cord that functions .

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