| 摘要 |
PURPOSE:To attain sure clock recovery by including a control recording part and an information write part for each of recording section so as to form tracking control pits and clock recovery pits to the control recording part. CONSTITUTION:A pit Q1 for generating a traverse count signal and pits Q2, Q3 for tracking control and clock recovery are formed in advance to a control storage area ARs of each block in advance. When the location is varied with each prescribed number of cycles of the recording track and the traverse count at each prescribed number of revolutions with respect to the recording track is applied based on the read output of the 1st pit Q1 varied with prescribed number of revolutions of the recording track. Moreover, based on the read output of the 2nd and 3rd pits Q2, Q3, the tracking error signal to keep always stable tracking state and more or less disturbance is caused to the optical beam with respect to the recording track, then a clock recovery control signal applying sure clock recovery is obtained. |
