ANTI-REFLECTION FILM AND OPTICAL ELEMENT HAVING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an optical element that offers high stain resistance and superior anti-reflection performance.SOLUTION: An anti-reflection film is formed on a transparent substrate and includes a low refractive index layer formed by binding hollow microparticles together using binder, and a surface layer formed on top of the low refractive index layer to cover a surface thereof. A hexadecane contact angle θA and refractive index nA of the low refractive index layer, and a hexadecane contact angle θB and refractive index nB of the surface layer satisfy conditions expressed as: θA>θB and nA