JPS6027362Y2 - Glass fiber for reinforcement light transmission - Google Patents

Description

[Detailed description of the invention] The invention uses glass fiber for optical transmission (hereinafter referred to as optical fiber).

) is related to the reinforcement structure.

Conventionally, various methods have been used to reinforce optical fibers.

For example, as shown in Figure 2, the outer circumference of the optical fiber 1 is made of nylon N.
There are optical fibers in which optical fibers are closely attached, but the tensile strength is on the order of 9 (
The outer diameter is 1 to 1.5φ) and the strength varies widely.

In addition, since the optical fiber and nylon are in close contact with each other, it is difficult to peel off the skin), the strength of the reinforcing fiber is low, and the strength varies widely, so when it is made into a cable, a tension member must be inserted, resulting in a large cross-sectional area of the cable. There were drawbacks such as:

The present invention has been made to solve the above-mentioned drawbacks.

As shown in Fig. 1, a plastic coating layer 2 is adhered onto the optical fiber 1, preferably in order to prevent the growth of cracks on the surface of the fiber, and a large number of fibers 3 with a diameter of several microns and a large Young's modulus are gathered around the plastic coating layer 2. The fiber bundles 4 are arranged vertically or twisted together without gaps, and the periphery thereof is coated with a thermoplastic resin such as nylon, polyethylene, or vinyl chloride.

Glass fibers, carbon fibers, and metal fibers are recommended as fibers with a high Young's modulus, and Kepler (a DuPont product name made by making thin fibers from aromatic polyamide resin and collecting them into fiber bundles) is desirable as a plastic fiber. .

The tensile strength of these fibers is approximately 200 to 300 kg/r.
lIIt, and the diameter of the optical fiber 1 is approximately 100 to 30
The coating layer 2 has a thickness of several microns to several tens of microns, and the diameter of the fiber bundle 4 is optional, for example, about 200 microns, and each fiber bundle 4 can withstand a tensile force of 9.

The thickness of the thermoplastic resin 5 is arbitrary, but the outer diameter is 1 to 1.5.
It is easy to handle at the level of φ.

As shown in Figure 1, for example, when six glass fiber bundles with a diameter of 200μ are arranged around an optical fiber, the tensile strength is 6 x even if the tensile strength of the optical fiber and thermoplastic resin is ignored.
5kg/piece = 30kg, which is much higher than the 8.5k tensile strength of the core wire of a communication cable (copper wire of 0.65φ), and will not break the optical fiber in normal equipment. The newly developed glass fiber for reinforced optical transmission has low elongation and has extremely high tensile strength.

In addition, since the strength of each cable is high, when it is made into a cable, a tension member is not required and the cross-sectional area of the cable becomes small.

Further, by using a thermoplastic resin, the coating layer can be easily removed by melting or using a knife, and since the coated optical fiber is not bonded to surrounding fiber bundles, the optical fiber can be easily taken out.

Conventionally, a similar structure has been proposed in which a reinforcing glass fiber layer is coated and solidified with a thermosetting resin such as epoxy or polyester.

Although this achieves the purpose of increasing the mechanical strength of the optical fiber, it has the drawback that the glass fiber layer is solidified, making it extremely difficult to process the end of the fiber when connecting or measuring the fiber.

The present invention provides a fiber structure that has improved mechanical strength and is extremely easy to terminate.

[Brief explanation of drawings]

FIG. 1 shows a sectional view of an optical fiber according to the present invention, and FIG. 2 shows a sectional view of a conventional optical fiber. 1... Optical glass fiber, 2... Coating layer, 3... Fiber with large Young's modulus,
4... Fiber bundle, 5... Thermoplastic resin.

Claims (1)

[Scope of utility model registration request] A glass fiber for reinforced optical transmission, characterized in that a fiber bundle made up of a large number of fibers with a large Young's modulus is arranged vertically or twisted together around an optical fiber, and the surrounding area is further coated with a thermoplastic resin.