JPS61296315A - Optical fiber - Google Patents

Abstract

PURPOSE:To prevent the effect of the outside world on an optical fiber by forming a thin-walled ribbon wire to a tubular shape by butting both side ends thereof, winding spiral wires consisting of an elastic material here and there to the outside peripheral part of the optical fiber and forming the same as a core part. CONSTITUTION:The material of an outside shell 2 is the kind of a rigid resin, metal, etc. and both side ends 21, 22 are butted to be formed to a tubular shape. The shell 2 is formed by gradually curving both side ends of the straight-angle belt-shaped material by means of working tools such as dies or rolls to form the straight-angle belt to the tubular shape. A gap to allow the presence of the optical fiber 1 is provided in such tubular shape and the spiral wires 3 having elastic power are wound to the outside peripheral of the fiber 1. The slight force exerted to the optical fiber is made freely transmittible to some extent in the shell 2 by the elastic materials 3. The optical fiber which is kept free from unnecessary force as far as possible is thus obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to communication lines such as optical fibers.

In order to protect communication lines such as optical fibers and prevent the outer peripheral surface from being easily damaged, the present invention provides an outer shell made of metal or a similar hard resin material sufficient to protect the optical fibers. cover the communication lines of the
It is a device that can prevent IZW from entering communication lines such as optical fibers from the outside world, and has a wide range of uses.

(Conventional technology) The difference from the conventional technology is that when the optical fiber is placed in the outer shell as in the product, a spiral wire is interposed between the outer shells as in the present invention. The problem to be solved by the present invention is how to insert a fine wire such as an optical fiber into the outer shell. The question is whether to let it stay in the room and fix it. Conventionally, even when optical fibers are placed inside an outer shell, there have been ten important problems in handling optical fibers, depending on how the gap between the outer shell and the optical fiber is maintained. This is because with conventional technology, it was difficult to coat optical fibers to a considerable length.
In other words, a considerable length as used herein means a length of 300 meters or more. Inserting this length into a tube is
This was not possible with conventional technology. The tensile strength of the inserted optical fiber is weak in proportion to the strength of the outer shell tube, so if a tensile force is applied to the optical fiber pressed inside the outer shell, the optical fiber will break. . The present invention is provided to solve this problem.

(Means for Solving the Problems, Actions, Examples, and Effects) The present invention provides a method that has not existed in the past as a means for solving the problems. It is necessary for the optical fiber to be able to move smoothly to some extent within the outer shell. If the optical fiber is firmly fixed to the outer shell, even if a slight tensile force is applied to the optical fiber. The tensile strength of the optical fiber becomes a tensile force, which adds an unpleasant force to the optical fiber. Therefore, in the present invention, even if a slight force is applied to the optical fiber in the relationship between the outer shell and the optical fiber, the force is not immediately transmitted to the optical fiber.
It provides a structure that allows the optical fiber to move elastically within the shell to a certain extent. While explaining one embodiment of the present invention with drawings, the operation of the present invention,
Explain the details of the effect.

FIG. 1 relates to one embodiment of the present invention, and is a partially sectional perspective view for illustrative purposes. FIG. 2 is a partial view of the main parts of the present invention.

1 is an optical fiber, 2 is an outer shell, and the material of 2 is hard resin, metal, or the like.

2, the opposite ends of 21 and 22 are butted together to form a tube shape. This second outer shell was initially shaped like a flat band, but by using processing tools such as dies and rolls, both ends of the flat band were gradually curved to form the shape shown in Figure 1. Form into a tube shape as shown in .

This tube shape has a gap in order to accommodate the optical fiber therein. The present invention is characterized in that a spiral wire having an elasticity of 3 is wound around the outer circumference of the optical fiber 1. The role of the spiral shape 3 is to connect the optical fiber 1 and the outer shell body 2. It is abhorrent to optical fibers because the slight force applied to the optical fiber 1 can be made to move freely within the outer shell body 2 by the elastic body 3 without fixing between them. It is designed so that no force is applied, and by wrapping a helical spring with a ratio of 3 around the optical fiber 1, the intended purpose is to remove as much unnecessary force as possible from the fiber at the end that is not applied. It has a structure that allows it to stay inside the outer shell. The spiral wire 3 is wound in a larger circumference than the outer circumference of the optical fiber 1, or
As shown in FIG. 2, the outer periphery of the optical fiber may be coated with 11 outer circumferential protective resins, and there are methods such as loosely winding the coated outer circumferential surface. In any case,
These spiral wires are only partially wrapped. Moreover, since this can be easily wrapped from the outside of one optical fiber, the structure of the present invention can be easily manufactured. It is also low cost and has wide marketability.

[Brief explanation of the drawing]

FIG. 1 relates to one embodiment of the present invention, and is a partially sectional perspective view for illustrative purposes. FIG. 2 is a partial view of the main parts of the present invention.

Claims (1)

[Claims] An elastic spiral wire is wound here and there around the outer periphery of the optical fiber, and this is used as a core.The wire is placed on top of a thin ribbon wire, and the side ends of the ribbon wire are An optical fiber is characterized in that it is formed into a butt shape to form a tube shape, and an optical fiber is placed inside the outer shell.