| 摘要 |
An optical information recording/reproducing apparatus and are provided under a state where a focus servo is driven, a tracking error signal recorded on the recording medium or a sum signal of a photodetector is generated from a pencil of light guided onto the photodetector. Then, the signal amplitude of the tracking error signal or the sum signal of the photodetector is measured. Next, the relative tilt between the recording medium and the objective lens is roughly corrected until the signal amplitude reaches a threshold value determined in advance. After the rough correction, under a state where a tracking servo is driven on a predetermined track, tracking is performed on the predetermined track, detecting a tilt detection signal, and the relative tilt between the recording medium and the objective lens is finely corrected based on the tilt detection signal.
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