Method for obtaining an optimum focusing point of an optical pickup unit and a servo system of an optical disk drive using this method

Abstract

A method for obtaining an optimum focusing point of an optical pickup unit and a servo system of an optical disk drive using this method is disclosed. An optical pickup drive circuit controls a position of an optical pickup unit according to an optical pickup control signal. A compensator receives an input signal and thus generates the optical pickup control signal. By varying levels of the input signal may enable the optical pickup unit to move to different positions. The optical pickup control signal enables the optical pickup unit to move to an optimum focusing point when the input signal activates the optical pickup unit to achieve the situation that an average difference between a peak envelop and a bottom envelop of the optical pickup control signal is minimized, or that an amplitude and a level of the tracking error signal are maximized in accompanied with minimum distortion range.

Dependencies are inferred from the claim text.