PROTECTIVE FILM, REFLECTIVE MEMBER, AND PRODUCTION METHOD FOR PROTECTIVE FILM

摘要

This protective film is positioned on top of a metal film, which is has been fixed on a glass substrate, in order to protect the metal film. The protective film is characterized by being composed of a silica film, said silica film having an extinction coefficient (k) of 1 × 10-4 or lower at a wavelength of 632 nm, and a refractive index (n) of 1.466 or higher. The protective film is further characterized by having a carbon content of 3 at% or lower.