| 摘要 |
PURPOSE:To prevent the control defect of tracking and to smoothly record and reproduce the information of an optical card by providing at least a pair of auxiliary guide tracks curving so as to connect to the guide track of a prescribed area on a mirror face part. CONSTITUTION:A pair of auxiliary guide tracks 12a, 12b curving so as to connect to the guide tracks 6a, 6b of an information recording part are provided. The track 12a is connected to the track 6a at connection points 13 and 14, and the track 12b is connected to the track 6b at the connection points 15 and 16. Then, curves arriving at a position close to the end parts 17 of the mirror face part 4 are made between the points 13-14, 15-16. When the irradiating position of a laser beam 10 is entered to the mirror face part, the beam 10 irradiates the track 12 and tracks the track 12 and arrives at the points 13, 15 or 14, 16. Thereafter, the beam 10 tracks the tracks 6a, 6b. |
