| 摘要 |
PROBLEM TO BE SOLVED: To provide a single-core optical fiber tight cord which will not cause cracks in a coating, even if bending stress is added and which facilitates the extraction work of the optical fiber. SOLUTION: An optical fiber 3 is disposed in the center, and the outside of the fiber 3 is solidified with a UV resin 5B, with the addition of a plurality of glass fibers 5A outside the fiber 3 and further the fiber is coated with a UV resin 7 and with a material having superior stretching characteristics and bending characteristics, such as nylon (nylon 12) 9 as the outermost layer. Thus, even if bending stress is repeatedly added to the fiber, the coatings are free from cracks. Because the nylon (nylon 12) 9 has satisfactory slippage property, the work of drawing the fiber can be carried out easily.
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