PURPOSE: To prevent such a phenomenon that a recording film material moves along a guide groove accompanied by the repetition of recording and erasure and to improve the repeated characteristics of recording and erasure by adding oxygen to a recording film consisting of Te, Ge and Sb.
CONSTITUTION: A disk substrate 1 composed of a resin substrate of polycarbonate or the like is a resin substrate to which a laser beam guiding groove is preliminarily formed or a glass plate to which a groove is formed by a 2P method. The first and second dielectric layers 2, 4 are composed of a mixed material of ZnS-SiO2 and a recording film 3 is formed from a material consisting of Te, Ge, Sb and containing oxygen and a reflecting layer 6 is composed of an Al alloy and a protective layer 6 is bonded to the disk substrate 1 by an adhesive 7. Recording, erasure and regeneration are performed by irradiating the optical recording medium thus formed with laser beam subjected to emphasis modulation in the direction shown by the arrow 8 or detecting the reflected beam. The dielectric layers, the recording membrane layer and the reflecting layer are generally formed by a vacuum vapor deposition method or a sputtering method.
OTA TAKEO
UCHIDA MASAMI
KAWAHARA KATSUMI
FURUKAWA SHIGEAKI
