Method for manufacturing storage medium and apparatus for manufacturing information storage master disc

An apparatus for manufacturing an information storage master disc used to manufacture an information storage medium in which information is stored as a concave-convex pattern, using an inorganic-resist master disc formed by depositing on a substrate an inorganic resist layer reactive to thermal reaction associated with laser beam irradiation, the apparatus comprising:

• laser irradiation means that irradiates the inorganic resist layer of the inorganic-resist master disc with the laser beam;
• recording means that performs recording on the inorganic-resist master disc by differentiating depths of thermal reaction portions in the inorganic resist layer by inputting information to be stored in the information storage medium and varying power of the laser beam striking the inorganic-resist master disc over at least three levels according to the input information;
• and
• information storage master disc forming means that forms the information storage master disc having a concave-convex pattern in the inorganic resist layer by developing the inorganic-resist master disc having been recorded by the recording means.

An apparatus for manufacturing an information storage master disc used to manufacture an information storage medium in which information is stored as a concave-convex pattern, using an inorganic-resist master disc formed by depositing on a substrate an inorganic resist layer reactive to thermal reaction associated with laser beam irradiation, the apparatus comprising:

• a laser irradiation unit that irradiates the inorganic resist layer of the inorganic-resist master disc with the laser beam;
• a recording unit that performs recording on the inorganic-resist master disc by differentiating depths of thermal reaction portions in the inorganic resist layer by inputting information to be stored in the information storage medium and varying power of the laser beam striking the inorganic-resist master disc over at least three levels according to the input information;
• and
• an information storage master disc forming unit that forms the information storage master disc having a concave-convex pattern in the inorganic resist layer by developing the inorganic-resist master disc having been recorded by the recording unit.