OPTISCHES AUFZEICHNUNGSMEDIUM UND VERFAHREN ZU DESSEN HERSTELLUNG

摘要

A recording thin film, dielectric thin film, and reflective thin film are formed on a substrate in order. When a recording laser beam is applied to the substrate, an inorganic compound in the recording thin film is decomposed to produce gas and air-gaps are produced in the recording thin film. Because the substrate is heated and softened, recesses are produced on the substrate surface due to the pressure of the produced gas. Optical conditions are changed by the air-gaps and recesses and the reflectance is extremely decreased at the laser applied portion. Therefore, reproduction corresponding to CD standard is possible. Moreover, because the inorganic compound which is thermally decomposed to produce gas is used without using any organic dye, the medium realizes data storage with a satisfactory optical resistance and a high reliability and provides a high recording sensitivity.