| 摘要 |
PROBLEM TO BE SOLVED: To provide a multivalued information recording method for an optical recording medium, which is capable of performing high-density recording by multivaluing recording information by a simple recording method. SOLUTION: An optically rewritable optical recording medium (phase transition type optical disk) is irradiated with a laser light to form an initial recording pit 2, a part of the initial recording pit is erased by an erasing pit 3 based on multivalued information multivalued according to information to be recorded to form a secondary recording pit 4 and, by modulating the area of this secondary recording pit 2, the multivalued information is recorded. |
