| abstract |
PROBLEM TO BE SOLVED: To provide an optical element having an antireflection film having a hydrophobicity and a low refractive index, which can be applied to a lens having a low glass transition temperature. An optical element having an antireflection film 2 on a surface 11 of a lens 1, wherein the lens 1 has a portion with a substrate tilt angle of 50 ° or more in a projected area ratio of 10% or more with respect to the entire effective diameter, and is reflective. The prevention film 2 has an organically modified silica airgel layer, and the organically modified silica airgel layer is an optical element formed by a springback phenomenon, and a manufacturing method thereof. [Selection] Figure 1 |