| 摘要 |
PURPOSE:To suppress the penetration of moisture and steam to an adhering part even if a special adhesive agent is not used and to provide stable performance even at and under a high temp. and humidity by coating the entire part or juncture of the light guide devices with a water-repellent high-polymer. CONSTITUTION:The entire part of the juncture of an optical circuit board B having an optical circuit reinforced by respective substrates and the input side and output side light guide devices A1, A2 connected with optical fibers at the end is coated with a water-repellent silicone resin from the outside, by which the light loss and the fluctuation in branching accuracy area largely decreased under the conditions of the high temp. and high humidity. The juncture is then protected against the penetration of the moisture and steam even if commercially marketed adhesive agents which are not sufficient in water resistance are used. The serviceable temp. under the high-humidity conditions is thus greatly improved. |
