| 摘要 |
PURPOSE:To eliminate the optical crosstalk between adjacent tracks by aligning the irradiation points of plural laser beams which simultaneously irradiates plural concentric tracks on a rotating optical disk on a line crossing to the radius of the optical disk, and shifting the adjacent irradiation points mutually in the circumferential direction of the optical disk. CONSTITUTION:When the plural laser beams simultaneously irradiates the plural concentric tracks on a rotating optical disk 2, the irradiation points of the plural laser beams are aligned on the line crossing the radius of the optical disk 2, and the adjacent irradiation points are shifted mutually in the circumferential direction of the optical disk 2. Consequently the larger the cross angle between the radius of the optical disk 2 and the line, on which the radiation points are aligned, is set, the larger the distance between the irradiation points of the adjacent tracks is made. Thus, even when the track interval is narrowed, the optical crosstalk between the adjacent laser beams can be suppressed. |
