| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical disk device capable of executing high-speed overwriting by one laser beam source. SOLUTION: In overwrite-recording, an optical beam emitted from a semiconductor laser 21 is split into a main beam for recording and a preceding beam for deleting by a primary beam splitter 23, the preceding beam for deleting is modulated by an external modulator 29 to attenuate a recording power equal to a deleting power, synchronized with the main beam by a second beam splitter 24 and, on the track 53 of an optical disk 11, a deleting spot 51 by the preceding beam for deleting is arranged so as to precede a recording spot 52. |
