Magneto-optical disk and superdensity disk employing integral substrate, and method for manufacturing the same

Abstract

A magneto-optical disk and a superdensity disk, which comprises: a common integral substrate having grooves and pits formed on its both sides: and a film structure on each side of the integral substrate. They are manufactured by preparing two stampers; simultaneously forming grooves and pits on both sides of an integral substrate, by use of said two stampers mounted on a respectively fixed mold and a moving mold; and forming identical film structure on each side of said integral substrate by depositing materials from targets suspended to both sides of said integral substrate. The disks are superior in mechanical properties and reliability. As for reliability, the present MOD is prepared without using a bonding process, which overcomes the problem of adhesive out-flow. The presence of only one integral substrate brings about an increased data storage density, twice as much per substrate, while contributing to the lightness of disk and accompanied by various effects including reduction in access time, saving of the bonding process and time in the spin coating, and cost reduction.

Dependencies are inferred from the claim text.