PERIPHERAL FACE LIGHT EMISSION TYPE LIGHT GUIDE BAR HAVING AFFINITY LAYER

To provide a peripheral face light emission type light guide bar having an affinity layer capable of performing peripheral face light emission with high brightness even at a place away from a light source, and capable of maintaining high brightness of an outer peripheral surface even if it is used by being bent in a case where a cut wound is caused or in a severe environmental temperature.SOLUTION: There is provided a peripheral face light emission type light guide bar including a core layer 1 whose main material is acrylic resin and a clad layer 3 whose main material is fluorine resin for emitting light from an outer peripheral surface while guiding light made incident from the end surface in a longitudinal direction. An affinity layer 2 is provided between the core layer 1 and the clad layer 3. The affinity layer 2 has non-fluorine resin having adhesive property with the acrylic resin as a main material, and the clad layer 3 has resin having adhesive property with the affinity layer 2 as a main material.SELECTED DRAWING: Figure 1 【課題】光源から離れた箇所でも高い輝度で周面発光可能であるとともに、切創が生じた場合や過酷な環境温度において、屈曲させて用いたとしても、外周面の高い輝度を維持することができる、親和層を有する周面発光型導光棒を提供すること。【解決手段】アクリル系樹脂を主材とするコア層1とフッ素系樹脂を主材とするクラッド層3とを備え、端面から入射した光を長手方向に導光するとともに外周面から光を出射する周面発光型導光棒において、前記コア層1と前記クラッド層3との間に親和層2を備え、前記親和層2はアクリル系樹脂との接着性を有する非フッ素系樹脂を主材とするものとし、前記クラッド層3は前記親和層2との接着性を有する樹脂を主材とした。【選択図】 図1