| 摘要 |
PURPOSE:To prevent the generation of variation in reflected color and uneven color by providing an intermediate film between a synthetic resin base material having a refractive index of a specific value or above and a thick film of SiO2 in such a way that the refractive index and film thickness satisfy the specific relation with the refractive index of the synthetic resin base material and the SiO2 film. CONSTITUTION:An intermediate film having 0.3-5mu thickness and a refractive index (Nb) and a film thickness (db) is formed on a synthetic resin base material of >=1.56 refractive index (Ns) by using a material satisfying the relation expressed by the equation (lambda is 450-600nm incident wavelength). The adhesive strength between the base material and the thick film of SiO2 is improved if the intermediate layer having the compsn. of 10-80wt% TiO2, 0.1-10wt% Mo and 20-90wt% SiO2 is provided. An optical member of a lens or the like provided with >=2 layers of reflection preventing layers such an SiO2 layer, ZrO2 layer, SiO2 layer or the like successively on the innermost layer ZrO2 is manufactured on the thick film of SiO2. The generation of the ripple (subwave) on the specular reflectivity characteristic which is conspicuous in the case of the synthetic resin base material having a high refractive index is prevented and the generation of the variation in color and uneven color is prevented. |
