SIL NEAR-FIELD SYSTEM AND METHOD FOR TILT CONTROL

摘要

A near-field optical recording/reproducing apparatus and a tilt control method thereof are provided to prevent a collision between an information storage medium and the solid immersion lens by executing tilt control at the position to increase a tilt margin. A near-field optical recording/reproducing apparatus comprises a light source(21), an objective lens, an optical detector, a signal processing/determining unit(150), and a control unit. The objective lens condenses the light emitted from the light source and transmits near field light to an information storage medium. The optical detector detects a gap error signal used for air gap control between the information storage medium and the objective lens. The signal processing/determining unit determines tilt control position based on an edge voltage obtained by using the gap error signal. The control unit regulates relative tilt between the information storage medium and the objective lens about the tilt control position.