Patent ID: 7755986

Claim:
An optical disk apparatus which performs recording and/or reproduction of information with respect to an optical recording medium by using near-field light, comprising: a light source that emits laser light; optical means including an objective lens group positioned in close proximity to the optical recording medium to generate near-field light from laser light emitted from the light source; gap servo means for controlling a gap between the optical recording medium and the optical means on the basis of a return light quantity of the laser light via the optical means; focus adjusting means for adjusting focus of the near-field light radiated onto the optical recording medium of the optical means, in a state where gap servo is being performed by the gap servo means; and gap servo correcting means for correcting the gap servo by the gap servo means when focus of the near-field light is adjusted by the focus adjusting means, the gap servo correcting means multiplies a gap error signal for the gap servo by a normalized gain in accordance with an adjustment amount of the focus adjusting means.