| 摘要 |
PROBLEM TO BE SOLVED: To provide a disk drive capable of adjusting a tilt of an optical pickup using a warp angle corresponding to a situation in reproduction of a disk.SOLUTION: A distance difference &Dgr;d between positions P, Pand a difference &Dgr;h in focus height are calculated using pieces d, dof position information on positions P, Pin a radial direction of a disk "d" and focus drive voltages v, vobtained at the positions P, Prespectively, a warp angle &thetas; of the disk "d" corresponding to between the positions P, Pis calculated using the distance difference &Dgr;d and the difference &Dgr;h in focus height, and a tilt of an OPU 12 is adjusted based upon the warp angle &thetas;. |
