Optical interference film made of strongly adhering layers with high and low refractive index.

摘要

An optical interference film (25) includes a high refractive index layer (31) having at least one metal oxide selected from titanium oxide and tantalum oxide, and a low refractive index layer (33) having a refractive index lower than the high refractive index layer and being formed on the high refractive index layer. The lower refractive index layer also includes at least one metal oxide the same as that in the high refractive index layer to avoid inter-layer peeling of high and low refractive index layers.