Abstract: A method for detecting an obliquity of an optical disc drive is disclosed. The method includes the following steps: setting up and storing a function between the obliquity and a central error signal bias by performing a current level calibration upon a plurality of obliquities of the optical disc drive predetermined to be tested to obtain corresponding central error signal biases; performing the current level calibration upon an objective lens of the optical disc drive; obtaining a calibrated central error signal bias; and acquiring the obliquity of the optical disc drive by interpolating or extrapolating the calibrated central error signal bias according to the stored function between the obliquity and the central error signal bias.

Abstract: A method for detecting the obliquity of an optical disc drive is provided. The method includes the steps of calibrating balance gains of TE signals and CE signals with predetermined obliquities of the optical disc drive, curve-fitting and storing a relating function between the predetermined obliquities and the balance gains, calibrating the balance gains of signals for an installed optical disc drive, and acquiring an calibrated balance gain to find the obliquity of the optical disc drive from the relating function.