JPH0453207U

JPH0453207U -

Info

Publication number: JPH0453207U
Application number: JP9478090U
Authority: JP
Priority date: 1990-09-11
Filing date: 1990-09-11
Publication date: 1992-05-07

Description

[Brief explanation of the drawing]

第１図は本考案の防水型光フアイバケーブルの
一実施例を示す横断面図、第２図はそのスペーサ
のリムの形状の説明図、第３図は変形例を示す図
、第４図は本考案の他の実施例を示す防水型光フ
アイバケーブルの横断面図、第５図はその変形例
を示す図、第６図はスペーサ上に吸水膨潤テープ
を密接させる従来のケーブルの断面図である。図中、１は中心抗張力体、２はスペーサ溝、３
はスペーサ、４は光フアイバテープ、５は吸水膨
潤テープ、６は外被、７は高さの低いリム、８は
高さがスペーサ外径円周上にあるリム、９は空間
、１０は半円状となつているリム、１１は隙間を
示す。 Fig. 1 is a cross-sectional view showing one embodiment of the waterproof optical fiber cable of the present invention, Fig. 2 is an explanatory view of the shape of the rim of the spacer, Fig. 3 is a view showing a modified example, and Fig. 4 is a cross-sectional view showing an embodiment of the waterproof optical fiber cable of the present invention. FIG. 5 is a cross-sectional view of a waterproof optical fiber cable showing another embodiment of the present invention; FIG. 5 is a view showing a modification thereof; FIG. be. In the figure, 1 is the center tensile strength member, 2 is the spacer groove, and 3
is a spacer, 4 is an optical fiber tape, 5 is a water absorption swelling tape, 6 is an outer cover, 7 is a rim with a low height, 8 is a rim whose height is on the outer circumference of the spacer, 9 is a space, and 10 is a half The circular rim 11 indicates a gap.

Claims

[Scope of Claim for Utility Model Registration] 1. A waterproof optical fiber cable in which a water-absorbing swelling tape is applied on the outer periphery of a spacer in which an optical fiber is housed in a groove, characterized in that adjacent rims of the spacer have different heights. optical fiber cable. 2. A waterproof optical fiber cable in which a water-absorbing swelling tape is applied on the outer periphery of a spacer containing an optical fiber in a groove, characterized in that the cross-sectional top of each rim of the spacer is a curved surface with a radius smaller than the radius of the spacer. optical fiber cable. 3. In a waterproof optical fiber cable in which a water-absorbing swelling tape is applied on the outer periphery of a spacer with an optical fiber housed in a groove, the gap distance d between the outer circumferential surface of the spacer and the water-absorbing swelling tape held down is within the range of the following formula. An optical fiber cable characterized by: 0<d<(2HW-DW-2S)π+√A2πW A={(DW-2HW+2S)π} ² -4πW(HW-S)(mW-Dπ) However, d: Spacer outer circumferential surface and pressure-wrapped water-absorbing swelling tape W: Spacer groove width, H: Spacer groove depth, D: Spacer outer diameter, m: Number of spacer grooves, S: Total cross-sectional area of fibers or intervening objects stored in all grooves of the spacer, m The value divided by.