Patent ID: 8526287

Claim:
An optical disk apparatus, comprising: a light source which emits a light beam; a solid immersion lens which is arranged in a vicinity of a surface of an information carrier, which generates near-field light from the light beam emitted from the light source, and which condenses the generated near-field light onto the information carrier; a focusing unit which focuses the light beam on a prescribed information layer of the information carrier; a first light receiving unit which receives reflected light that has been reflected by an emission end face of the solid immersion lens; a gap control unit which controls a distance between the solid immersion lens and the surface of the information carrier, based on a signal output from the first light receiving unit; a second light receiving unit which receives reflected light from the prescribed information layer of the information carrier, in a plurality of divided light receiving regions; a positional deviation determination unit which determines a positional deviation between a focal point of the light beam and a point where information on the prescribed information layer is recorded or reproduced, based on a signal output from the second light receiving unit; and a stray light determination unit which determines a surface stray light component which is reflected light from the surface of the information carrier and which is included in a signal generated by the positional deviation determination unit, based on the signal output from the first light receiving unit, wherein the positional deviation determination unit includes a stray light correction unit which corrects the signal generated by the positional deviation determination unit, the stray light correction unit correcting the signal based on the surface stray light component determined by the stray light determination unit.