Reflection preventive synthetic resin lens

Abstract

Abstract PURPOSE:To obtain a lens having superior abrasion resistance and reflection preventive function, by forming an epoxy resin layer having high refractive index on a lens substrate having refractive index almost as high as said layer, and an inorganic reflection preventive layer on this layer. CONSTITUTION:The lens substrate consists of a copolymer of 10-30wt% first monomer having formula 3 (X is H or halogen, and R is H or alkyl) and the second monomer having >=1.55 refractive index of its homopolymer, and capable of radical polymerization, a homopolymer, such as a diallyl phthalate, or its copolymer, and it has 1.55-1.65 refractive index. A layer of an epoxy resin having formula I or II, high refractive index and small cross-linking contraction is formed on the surface of the substrate. The reflection preventive layer made of an inorganic material, such as SiO2, ZrO2, Y2O3, Yb2O3, or Al2O3, is formed on this epoxy resin layer by the vacuum vapor deposition method, thus obtaining a reflection preventive high refractive index lens having superior abrasion resistance and impact strength.

Inventors

• 👤 Hiroo Sumi
• 👤 住　宏夫
• 👤 Yoshihiko Kasai
• 👤 河西　嘉彦

Bibliographic Details