| 摘要 |
PURPOSE:To allow bit length recording even with an optical disk and to increase recording density by providing tracks for measuring sensitivity to the inner peripheral and outer peripheral parts of the optical disk. CONSTITUTION:The tracks T1, T2 for measuring sensitivity are provided to the inner peripheral and outer peripheral parts of the optical disk 10. A microcomputer 20, a pulse width changing circuit 16, a light emitting driver 14, a head 12 for executing writing/reading to and from the optical disk and a reproduction amplifier 22 are provided. Recording is executed in the tracks T1, T2 by variously increasing and decreasing prescribed pulse widths prior to writing of data to the optical disk. Reading errors are then investigated and the difference between the pulse width at which the errors are min. and the prescribed pulse width is determined and the recording to the ordinary tracks is executed after the pulses are corrected by this difference. |
