Patent ID: 8809421

Claim:
A light-shielding coating film for an optical element, the film being formed on a surface of a substrate composed of an optical material, the light-shielding coating film comprising: first particles at least having a refractive index (nd) of 2.2 to 3.5 for the d-line and an average particle size of 10 nm to 70 nm; second particles composed of at least one of silica and sericite, the second particles having an average particle size of 1 μm to 11 μm; a colorant; and a resin, wherein the first particle content is in the range of 10% by weight to 35% by weight, and second particle content is in the range of 1% by weight to 11% by weight, and wherein the ratio of the minimum absorbance to the maximum absorbance (minimum absorbance/maximum absorbance) of the light-shielding coating film for the optical element in the wavelength range of 400 nm to 700 nm is 0.7 or more.