| 摘要 |
PROBLEM TO BE SOLVED: To surely effectuate skew servo and drive to rotate an optical disk by detecting a skew for the reflectively change type optical disk and executing skew servo on the basis of the detected result of the skew. SOLUTION: A detect output of a two-split photosensor is supplied as a skew error signal by a skew error detect circuit comprising a subtractor, an adder and a divider to a skew servo circuit 11. Based on the signal, the skew servo circuit 11 generates a control voltage corresponding to a correction amount for correcting a relative tilt of an optical disk 1 and an optical pickup 2 and supplies the control voltage to a skew motor 10. The skew motor 10 drives on the basis of the control voltage from the skew servo circuit 11 to rotate a cam 8 for moving up and down one end of a supporting member 13 for the optical unit 4, thereby changing a tilt of the optical unit 4. The relative tilt of the optical disk 1 and optical pickup 2, namely, a skew is thus corrected.
|
