OPTICAL MEMBER PROVIDED WITH ANTI-REFLECTION FILM

摘要

Provided is an optical member that is appropriate for manufacturing and is provided with an anti-reflection film with sufficient optical characteristics. An optical member (1) includes a transparent substrate (30) and an anti-reflection film (40) that is formed on a surface of the transparent substrate (30). The anti-reflection film (40) includes a refractive index gradient structure layer (10) of which a refractive index gradually becomes larger at a position closer to the transparent substrate (30) in a thickness direction, and an interference layer (20) which is disposed between the refractive index gradient structure layer (10) and the transparent substrate (30) in order to prevent light from being reflected by an interference effect. A refractive index of the transparent substrate (30) is different from a refractive index of the refractive index gradient structure layer (10) on a side closest to the transparent substrate. A refractive index of the interference layer (20) changes in the thickness direction, and has values which are discrete from both refractive indexes of the refractive index gradient structure layer (10) and the transparent substrate (30) at a boundary between the interference layer and the refractive index gradient structure layer and at a boundary between the interference layer and the transparent substrate, and a value thereof on a side close to the refractive index gradient structure layer is different from a value thereof on a side close to the transparent substrate.