| 摘要 |
PURPOSE:To provide a strength characteristic against external force approximately equal to the strength characteristic of a metallic spacer by providing a layer consisting of a material having the smaller compressive modulus than the compressive modulus of a member forming spiral grooves for contg. an optical fiber formed on the outside circumference to the lower layer of said spiral grooves. CONSTITUTION:This spacer is formed by using an 'Aramid(R)' fiber reinforced plastic as a central tensile material 1, extrusion-molding a layer 2 of HDPE having the spiral grooves on the outside circumference and uniting these members by an adhesive agent while forming a thin aluminum tape 3 on the outside thereof in conformity with the grooves. The PE layer 2 generates the effect as a cushion and absorbs impact force when the impact is exerted to an optical cable, as said layer has the compression modulus smaller than the compressive modulus of the aluminum 3 forming the grooves. The grooves contg. the optical fibers is formed of the aluminum and therefore the effect as a shell is generated as against a side pressure by which the strength characteristic against the external force approximately equal to the strength characteristic of the metallic spacer is obtd. and flexibility approximately equiv. to the flexibility of a plastic spacer is provided. |
