| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical information processing method detecting that a light spot is off from a track with excellent reliability, preventing data destruction and also warranting data record. SOLUTION: This device uses a light source emitting a light beam, a recording medium having a track, an optical system forming the light beam on the recording medium as a light spot and recording information, a regenerative optical system 6 light receiving the light beam after the recording medium is irradiated and a track shift detection means 13 forming a track shift signal 11 showing a position shift amount between the track center and the light spot center by an output from a light receiving means. The information is recorded along the track while controlling the optical system so that the light beam follows up the track based on the track shift signal 11. Then, a track-off error signal showing that a track-off that the position shift amount between the track center and the light spot center exceeds an allowable amount occurs is outputted when the track shift signal 11 exceeds a prescribed value. The recording of the information by the light beam is stopped by the output of the track-off error signal, and the information is recorded on the place excepting the place causing the crack-off on the recording medium. |
