| 摘要 |
Provided is an antireflection paint for an optical element, including black primary particles and secondary particles, in which: the black primary particles each have at least a refractive index for a d line (nd) of 2.0 or more; a ratio between a maximum absorptivity of each of the black primary particles for light having a wavelength of 400 nm or more and 700 nm or less and a minimum absorptivity of each of the particles for the light is larger than 0.7; and the black primary particles have a smaller average particle diameter than an average particle diameter of the secondary particles. Such constitution can prevent surface reflection and internal reflection, absorb light in a visible region well, and alleviate an influence on an environment. |
