| 摘要 |
PURPOSE:To rapidly and accurately make an access to an optical recording medium by setting up band-like areas each of which is pinched with respective reference lines out of juxtaposed plural lines as data track areas, providing track number parts on the part of the reference line or the data track area along its longitudinal direction and providing clock bits on the reference line. CONSTITUTION:Plural band-like reference lines 4 are juxtaposed on a recording medium 2 provided on a card type substrate 1 and the band-like area pinched with respective reference lines 4 are set up as the data track areas 3. A 1st track number part B1 and a 2nd track number part B2 are formed on the data track area 3 and band-like lines from a 1st leading part A1 up to the 1st track number part B2 and from a 2nd track number part B2 up to a 2nd leading part A2 are continuously formed on the reference line 4. In addition, clock bits 5 are provided on the reference line 4 corresponding to a data recording part C. Consequently, a card type optical recording medium on which many data tracks are arranged can be also rapidly and accurately accessed. |
