| 摘要 |
PURPOSE:To prevent crosstalk due to the expansion of a bit width from being increased, by setting entire plane of the recording film of an optical memory disk before it is used at an amorphous state, performing erasure only on a groove, and performing recording, reproduction, and the erasure on the groove. CONSTITUTION:After a part (between the groove) 5 except the groove (on the groove) 4 where the recording, the reproduction, and the erasure of information are performed on a recording film, is formed in the amorphous state similarly as a recording bit, the recording, the reproduction, and the erasure are performed on the groove 4. Also, at time of erasing the information, a laser power which generates no erasing state (crystallized state) of the part 5 between the groove is set on the recording film. Thus, since the part 5 between the groove is set at the same amorphous state similarly as a write bit, the bit can be read as a bit 7 having the bit shape of a uniform width even when the bit width of a bit 3 recorded on the groove 4 is expanded and it is forced out to the part 5 between the groove. In such way, the crosstalk due to the expansion of the bit width can be completely suppressed.
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