Patent ID: 6493144
Filing Date: 2002-12-10
Classification: G02B

Abstract:
An optical component comprising:a molding formed out of a material containing a norbornene resin having a polar group; and an anti-reflection film formed on a surface of the molding, the anti-reflection film comprising, from a molding side to an air side: an equivalent film of which an overall refractive index as calculated according to formula 1below is 1.52 to 1.8, the equivalent film including, from the molding side to the air side, an intermediate layer measuring 10 to 50 nm in mechanical film thickness and containing Al2O3, a first high-refractive-index layer, and a first low-refractive-index layer containing SiO2 as a main ingredient, N=ng+&Sum;i=13&it;[4&it;(ni-ng)&it;ni&it;di]1where ng represents a refractive index of the molding and ni and di represent a refractive index and a mechanical film thickness, respectively, of an i-th layer of the equivalent film as counted from the molding side;a second high-refractive-index layer measuring 0.4&lgr; to 0.6&lgr;, where &lgr; is 480 to 550 nm, in optical film thickness and containing TiO2 as a main ingredient; and a second low-refractive-index layer measuring 0.2&lgr; to 0.3&lgr;, where &lgr; is 480 to 550 nm, in optical film thickness and containing SiO2 as a main ingredient.