| 摘要 |
PURPOSE:To improve a reproduction speed by two-dimensionally arraying information tracks, which are linearly arrayed, in the longitudinal direction and the direction perpendicular to the former one, extending separation areas for identifying tracks in the same direction and providing an optical head introduction area when said separation areas are installed on both sides. CONSTITUTION:Unit data areas 204 are linearly arranged, and further arrayed two-dimensionally to obtain an information track area 201. The separation areas 202 are installed on both sides. One of said areas and the area 201 comprise a band 203. In such constitution, the upper part of the area 202 is extended in the same direction different from that of the area 204, and the optical head intrudction area 205 is formed on the extension part. Thus a track reading head can be controlled correctly at a high speed and no reading error occurs when the target track reading head is accessed over the separation areas. |
