| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that a track error detection by three-beam system causes detection sensitivity to change and track control to be unstable depending on a radial position, in an information recording device using plasmon resonance, which requires improved control accuracy of nanometer-order or sub-nanometer-order for track error detection.SOLUTION: The radial position is divided into a plurality of track detection zones, and target arrangement of a track detection resonance element is individually set so that the three-beam system is established for each track detection zone, thereby arranging the track detection resonance element in an operating range of a track micromotion part and performing stable track error detection. |
