Patent ID: 6678221
Filing Date: 2004-01-13
Classification: G11B

Abstract:
An optical disk apparatus which comprises: an optical pickup which performs recording or reproduction of information into/from an optical disk medium having a track for information recording; a focus control means for controlling the optical pickup so as to focus a light beam on the optical disk medium; a tracking actuator which drives the optical pickup so that an irradiated position of the light beam follows the track for information recording; a track error detecting means for detecting a deviation from the track position of the irradiated position of the light beam; an adjusting means for adjusting gain and offset of a track error signal outputted by the track error detecting means; and a tracking driving means for driving the tracking actuator according to an output signal of the adjusting means, comprising:an amplitude detecting means for detecting amplitude of the track error signal; and a transfer means for transferring the optical pickup in a radial direction of the optical disk medium, wherein the focus control means focuses the light beam irradiated from the optical pickup onto the optical disk medium, and the adjusting means adjusts the gain and offset of the track error signal when the amplitude of the track error signal detected by the amplitude detecting means is equal to or larger than a previously set value, while the optical pickup is transferred to a previously decided position when the amplitude of the track error signal detected by the amplitude detecting means is under the previously set value.