| abstract |
An optical device that does not deteriorate even in an accelerated deterioration test that repeats a high temperature and high humidity state and a low temperature state. A shaft-shaped core 30 in which a photocurable resin is photocured in a self-collecting manner inside a translucent housing 10 and a clad 40 made of an organosilsesquioxane, an epoxy resin, and an oxetane resin are provided. Have. Since the epoxy resin and the oxetane resin have a much lower shrinkage in curing than the acrylic resin, almost no tensile stress remains in the clad 40 that is the formed cured product. Epoxy resins, oxetane resins and organosilsesquioxanes have high heat resistance, and unlike acrylic resins having an ester bond, they have low hygroscopicity, so that they do not swell due to moisture even under high temperature and high humidity. Furthermore, the translucent housing 10 may be formed of an epoxy resin and an oxetane resin. [Selection] Figure 1 |