Patent ID: 8189261

Claim:
An optical component comprising: a plastic substrate; and an antireflection film disposed on the substrate, wherein the antireflection film is a multilayer film having alternately-laminated six or more layers including high refractive index layers and low refractive index layers; a first layer of the antireflection film deposited closest to the substrate is a high refractive index layer; λ satisfies 480 nm≦λ≦530 nm where λ is the wavelength of light incident into the antireflection film; an optical thickness D 1 of the first layer satisfies 0.02λ≦D 1 ≦0.04λ; an optical thickness Dm of a layer of the antireflection film that is located fifth from an outermost layer deposited furthest from the substrate satisfies 0.19λ≦Dm≦0.75λ, wherein the layer is a low refractive index layer; a total physical thickness dt of the entire antireflection film satisfies 350 nm≦dt≦480 nm; and a total physical thickness da of the low refractive index layers satisfies 0.65 dt≦da≦0.80 dt.