Patent ID: 8531927

Claim:
An optical disc apparatus, comprising: a light irradiation/reception section configured to irradiate an optical disc recording medium with laser light via an objective lens, and to receive return light of the laser light from the optical disc recording medium via the objective lens; a tilt adjustment section configured to tilt the objective lens; a focus servo control section configured to exert focus servo control over the objective lens based on a light-reception signal obtained by the light irradiation/reception section receiving the return light; a focus bias application section configured to apply a focus bias to a focus servo loop formed as a result of the focus servo control by the focus servo control section; a tracking direction error signal generation section configured to generate, based on the light-reception signals obtained by the light irradiation/reception section performing splitting-light reception in a tracking direction, a tracking direction error signal representing an error between the light-reception signals; and a control section configured to perform a tilt adjustment value search process for making a search for, based on the tracking direction error signals as a result of setting various tilt adjustment values to the tilt adjustment section, a tilt adjustment value with which the tracking direction error signal is maximized, a tilt adjustment value revision process for revising the tilt adjustment value found by the tilt adjustment value search process based on difference information representing a difference between a tilt adjustment value with which a signal quality estimation value is maximized, and the tilt adjustment value with which the tracking direction error signal is maximized, the signal quality estimation value being generated based on a reproduced signal of a signal recorded on the optical disc recording medium, the difference information being calculated in advance under a condition of using a focus bias value found by a search/setting method same as a search/setting method for a focus bias value to be set to the focus bias application section when the tilt adjustment value search process is performed, and an adjustment control process for causing the tilt adjustment section to perform tilt adjustment based on the tilt adjustment value obtained by the tilt adjustment value revision process, wherein the search/setting method for the focus bias value is for making a search for a focus bias value with which the tracking direction error signal is maximized, and setting a focus bias value obtained by providing a first offset value to the focus bias value found by the search, and before performing the tilt adjustment value search process, the control section performs a focus bias adjustment process for making a search for the focus bias value with which the tracking direction error signal is maximized, and setting, to the focus bias application section, the focus bias value obtained by providing the first offset value to the focus bias value found by the search.