JPH1048488A - Optical fiber cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an optical fiber cable having a structure fixable by means of staples, etc., without adversely affecting the optical fibers. SOLUTION: This optical fiber cable is formed to have a structure by coupling protective parts 40 having coatings 44 on tension members 42 to both sides of a main body part 30 having the coating 34 on a coated optical fiber 32 and connecting these parts via a neck part 50. In addition, in the optical fiber cable, it is made to satisfy the relation of (the height (a) of the main body part 30)<(the height (b) of the protective parts 40). The exertion of external force in the main body part 30 is then prevented when the cable is fixed by stapling. If the cable made to satisfy the relation of (the transverse width (c) of the protective parts 40)>(the transverse width (d) of valley parts 52), the drop of the protective parts 40 of the upper layer cables into the valley parts 52 of the lower layer cables does not arise and, consequently, compressive force is not acted on the coated optical fibers 32 of the lower layer cables 20 and the occurrence of transmission loss does not arise.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber cable, and more particularly to an indoor small-fiber-optic cable.

[0002]

2. Description of the Related Art An indoor small-fiber optical fiber cable shown in FIG. 3 is known. 10 is an optical fiber core, 12 is a tension member, 14 is a plastic coating, and has a tearing groove 140.

[0003]

SUMMARY OF THE INVENTION
Although it is easy to take out the optical fiber core wire 10, it cannot be fixed with a staple or the like because it is easily torn from the groove 140 by an external force. Cable laying is performed by a method such as lightly tying using an insulation tie or the like, or performing wiring. Therefore, it is desired to realize an optical fiber cable having a structure that can be fixed with a staple or the like without adversely affecting the optical fiber.

[0004]

Means for Solving the Problems As exemplified in FIG.
The structure of the optical fiber cable 20 is as follows. On both sides of the body portion 30 having a coating 34 around an optical fiber core 32, a coating 4 around a tension member 42 is provided.
The protective part 40 having the four is connected via a neck 50 of an integral structure, and the height a of the main body part 30 is lower than the height b of the protective part 40.

If a <b, the external force is prevented from being applied to the optical fiber core 32 when the stapling is performed. This will be described again later.

Incidentally, in addition to the above structure, the width c of the protection portion 40 may be longer than the distance d between the protection portions 40 in addition to the above structure.

As described above, when c> d, when the optical fiber cable 20 is wound around a drum, the protection portion 40 does not fall into the valley portion 52. This will be described again later.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example shown in FIG. 1 will be described.
The optical fiber cable 20 includes a main body portion 30 and a protection portion 4.
It consists of 0. The main body portion 30 is provided with a plastic coating 34 having a circular cross section around an optical fiber core 32. The protection portion 40 is provided with a plastic coating 44 having a square cross section around the tension member 42. The protection portions 40 are provided on both sides of the main body portion 30, and are connected to each other via a neck 50 to form an integral structure. The height a of the main body portion 30 is lower than the height b of the protection portion 40, and the width c of the protection portion 40 is longer than the distance d between the protection portions 40. Reference numeral 52 denotes a valley formed between the protection portions 40 on both sides.

[Another Embodiment] The cross section of the protection portion 40 is as follows.
In addition to the square as described above, a round shape or any other shape can be used as shown in FIG.

[Manufacturing method] This optical fiber cable 20
It can be manufactured by supplying the optical fiber core wire 32 and the two tension members 42 side by side to a conventionally known extruder using a deformed die, and extruding and coating the coatings 34, 44 and the neck 50 simultaneously.

[Usage method, etc.] How to draw out the optical fiber core wire 32: First, the neck portion 50 is torn with a knife or the like to separate the main body portion 30 from the protection portion 40, and the sheath 34 of the main body portion 30 is cut with a knife to emit light. The fiber core 32 is exposed. -Fixing method of the optical fiber cable 20: As shown in FIG. 1B, the optical fiber cable 20 can be fixed to the structure 62 by the staple 60. At this time, as described above, since the height a of the main body portion 30 is smaller than the height b of the protection portion 40, an external force at the time of stapling is not applied to the main body portion 30 and the optical fiber core wire 32 is damaged. There is no fear of sticking.

FIG. 1C schematically shows a state in which the optical fiber cable 20 is wound around a drum 64.
Is a winding drum, and 68 is a collar. Since the width c of the protection portion 40 is larger than the width d of the valley portion 52 when the drum is wound in this manner, the protection portion 40 of the upper layer cable 20 does not fall into the valley portion 52 of the lower layer cable 20. Therefore, no compressive force is applied to the optical fiber core 32 of the lower layer cable 20, and the optical fiber is not damaged and transmission loss does not occur.

[0013]

【The invention's effect】

(1) In the case of the invention described in claim 1, the cable can be fixed by a stapler. (2) In the case of the invention described in claim 2, the cable can be fixed by the stapler, and the transmission loss does not occur when the drum is wound as described above.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of another example of the embodiment of the present invention.

FIG. 3 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Optical fiber core 12 Tension member 14 Coating 140 Groove 20 Optical fiber cable 30 Main part of optical cable 32 Optical fiber core 34, 44 Coating 40 Protective part 42 Tension member 50 Neck 52 Trough 60 Staple 62 Structure 64 Drum 66 Winding Torso 68

Claims (2)

[Claims] 1. A protective portion having a coating around a tension member on both sides of a body portion having a coating around an optical fiber core, and a protective portion having a coating around the tension member is connected to each of the coatings through a one-piece neck. An optical fiber cable, wherein a height of the main body portion is lower than a height of the protection portion. 2. The optical fiber cable according to claim 1, wherein the width of the protection portion is longer than the interval between the protection portions.