HIGH DENSITY OPTICAL DISK USING AMORPHOUS REFLECTION FILM

摘要

PURPOSE: A high density optical disk using an amorphous reflection film is provided to improve reliability of data by reducing noise of the optical disk by restricting surface roughness due to growth of crystal grain occurring when a thin film is grown, by using reflection film material of an amorphous type. CONSTITUTION: A high density optical disk using an amorphous reflection film includes a substrate(2), a reflection film(4), and a protection cover layer(5). The substrate has pre pit containing information. The reflection film is formed on the substrate and made of amorphous material to minimize noise of reflected beam of incident laser beam by minimizing a surface roughness. The protection cover layer is formed on the reflection film. The laser beam is incident opposed to the surface of the reflection film after piling up of the laser beam.