OPTICAL DISK AND SPUTTERING METHOD OF REFLECTING FILM AND PRODUCING METHOD OF REFLECTIVE LAYER

摘要

An optical disc having an aluminium reflective film is disclosed, wherein an oxide of A l in the stable oxidised state is introduced into the A l reflective film to eliminate changes with lapse of time to improve durability of the optical disc. A method of producing a reflective film on an optical disc is also disclosed, wherein a trace amount of oxygen is introduced into the atmosphere in the course of formation of the reflective film. <IMAGE>