| 摘要 |
PROBLEM TO BE SOLVED: To quickly and precisely detect a tilt amount without an exclusive sensor. SOLUTION: An optical disk reproducing device 10 is provided with an optical pickup 11 reading out the digital data recorded on an optical disk, an amplitude detection circuit 18 detecting the amplitude of a wobble component signal passed by a band-pass filter 14 and a tilt detection circuit 24 detecting the tilt amount. The optical disk reproducing device 10 is provided with a groove part G consisting of a structure alternately connecting a wobble groove part WG and a straight groove part SG, and obtains difference values of the amplitude of respective wobble component signals based on return beams in the cases that laser beams emitted to the optical disk that one side of both side walls of a recording area is the wobble groove WG and the other side is the straight groove SG are placed to the inner peripheral side and the outer peripheral side of the optical disk than the wobbled part as tilt instruction values. |
