| 摘要 |
PROBLEM TO BE SOLVED: To record information in a depth direction of a groove as an information storage medium where information is stored by forming irregular patterns. SOLUTION: Inorganic resist sensitive to a thermal reaction associated with the irradiation with a laser beam, preferably an incomplete oxide of a transition metal, is used as a resist material of a master disc. A Laser beam is applied to the master disc by changing power at least in three steps based on input information, and the depth of a thermal reaction section in the inorganic resist is changed for recording information. By developing the master disc, a master disc where input information is recorded by a plurality of stages of grooves can be produced. COPYRIGHT: (C)2009,JPO&INPIT |
