| 摘要 |
PURPOSE:To provide the optical lens which has high film strength and has less film stresses by forming the antireflection film of a lens body consisting of a synthetic resin into a 4-layer structure consisting of an inorg. material having prescribed characteristics. CONSTITUTION:The optical lens consists of the antireflection film formed by laminating a 1st layer 2 which consists of a material having an excellent adhesive property to the synthetic resin, a 2nd layer 3 which consists of a material satisfying spectral characteristics, a 3rd layer 4 which consists of a material having excellent scratching resistance and chemical durability, and a 4th layer 5 which satisfies the spectral characteristics successively on the surface of the lens body consisting of the synthetic resin. The 1st layer 2 plays the roles of assuring the adhesive strength to the lens body consisting of the synthetic resin. The 2nd layer 3 cancels the residual film stress generated in the respective other layers and the 3rd layer 4 plays the role of protecting the lens body. The 4th layer 5 exhibits the function to maintain the optical characteristics. The deformation of the lens body surface is, therefore, obviated and the excellent optical characteristics are assured. |
