Method for calibrating a spherical aberration compensation level in an optical drive
View Patent ↗A method for calibrating an SA compensation level of an optical drive is provided. The method includes steps of providing a plurality of SA compensation levels; obtaining a peak-to-peak value of an S curve corresponding to each of the SA compensation levels; selecting a maximum of the peak-to-peak values of the S curves and the SA compensation level corresponding to the maximum; and setting the selected SA compensation level to be an optimal SA compensation level.
1. A method for calibrating a spherical aberration (SA) compensation level of an optical drive, comprising steps of:
(a) providing a plurality of SA compensation levels;
(b) obtaining a peak-to-peak value of an S curve of a focus error signal corresponding to each of the SA compensation levels;
(c) selecting a maximum of the peak-to-peak values of the S curves and the SA compensation level corresponding to the maximum; and
(d) setting the selected SA compensation level to be an optimal SA compensation level.
2. The method according to claim 1 , wherein the steps are performed in a start up procedure of the optical drive.
3. The method according to claim 2 , wherein the start up procedure comprises initializing system parameters, compensating signal offsets, determining a type of an optical disk, and focusing a laser beam of an optical pickup head on the optical disk.
4. The method according to claim 1 , wherein a focus actuator is used to control a position of a focus object lens and an open-loop control is performed such that an optical detector can obtain the S curve.