JPH0269306U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本考案による単心光ケーブルの破断構
造を表す斜視図、第２図は加熱処理時間とその後
のシースの収縮量との関係を表すグラフ、第３図
は光フアイバ素線の開口数と温度によるその伝送
損失の増加量との関係を表すグラフである。 又、図中の符号で、２はコア部、３はクラツド
部、４は一次被覆層、５は光吸収層、６は二次被
覆層、７は抗張力繊維、９は耐熱テープ、１０は
シースである。 Figure 1 is a perspective view showing the fractured structure of the single-core optical cable according to the present invention, Figure 2 is a graph showing the relationship between heat treatment time and the amount of shrinkage of the sheath afterward, and Figure 3 is the numerical aperture of the optical fiber. 2 is a graph showing the relationship between the amount of increase in transmission loss and the amount of increase in transmission loss due to temperature. In addition, the symbols in the figure are: 2 is the core part, 3 is the clad part, 4 is the primary coating layer, 5 is the light absorption layer, 6 is the secondary coating layer, 7 is the tensile strength fiber, 9 is the heat-resistant tape, and 10 is the sheath. It is.

Claims (1)

【実用新案登録請求の範囲】 (1) コア部とこのコア部を囲むクラツド部とか
らなり且つ開口数が０．２５以上の光フアイバ素
線と、この光フアイバ素線を囲むシリコン樹脂製
の一次被覆層と、この一次被覆層を囲む弗素樹脂
製の二次被覆層と、この二次被覆層を囲む抗張力
繊維の撚線部と、この撚線部の周囲に巻回された
耐熱テープ層と、前記光フアイバ素線に沿つて配
向する耐熱性化合物の針状結晶を含み且つ前記耐
熱テープ層を囲む弗素樹脂製のシースとを具えた
単心光ケーブル。 (2) コア部とこのコア部を囲むクラツド部とか
らなり且つ開口数が０．２５以上の光フアイバ素
線と、この光フアイバ素線を囲むシリコン樹脂製
の一次被覆層と、この一次被覆層の内部に前記光
フアイバ素線と接しない状態で形成されるか或い
は当該一次被覆層の外側を囲む黒色光吸収層と、
これら黒色光吸収層及び一次被覆層を囲む弗素樹
脂製の二次被覆層と、この二次被覆層を囲む抗張
力繊維の撚線部と、この撚線部の周囲に巻回され
た耐熱テープ層と、前記光フアイバ素線に沿つて
配向する耐熱性化合物の針状結晶を含み且つ前記
耐熱テープ層を囲む弗素樹脂製のシースとを具え
た単心光ケーブル。[Scope of Claim for Utility Model Registration] (1) An optical fiber strand consisting of a core part and a cladding part surrounding the core part and having a numerical aperture of 0.25 or more, and a silicone resin strand surrounding the optical fiber strand. A primary coating layer, a secondary coating layer made of fluororesin surrounding this primary coating layer, a stranded portion of tensile strength fibers surrounding this secondary coating layer, and a heat-resistant tape layer wound around this stranded portion. and a fluororesin sheath containing needle-shaped crystals of a heat-resistant compound oriented along the optical fiber and surrounding the heat-resistant tape layer. (2) An optical fiber consisting of a core and a cladding surrounding the core and having a numerical aperture of 0.25 or more, a primary coating layer made of silicone resin surrounding the optical fiber, and the primary coating. a black light absorbing layer that is formed inside the layer so as not to be in contact with the optical fiber strand or that surrounds the outside of the primary coating layer;
A secondary coating layer made of fluororesin surrounding the black light absorption layer and the primary coating layer, a stranded portion of tensile strength fibers surrounding this secondary coating layer, and a heat-resistant tape layer wound around this stranded portion. and a fluororesin sheath containing needle-shaped crystals of a heat-resistant compound oriented along the optical fiber and surrounding the heat-resistant tape layer.