High-Speed Tracking Servo Using Zero Phase Error Tracking-Feed-Forward Method for Professional-Use Optical Disks over 10000 rpm

概要

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We have realized a high-speed and precise tracking servo using a feed-forward control with the zero phase error tracking method (ZPET-FF control) on an optical disk at the disk rotation speed of 10800 rpm. To realize a high-data-transfer-rate recording of more than 200 Mbps over the entire disk area, the optical head must be controlled with an accuracy of better than 9 nm at the maximum rotation speed of about 10800 rpm for track following on a high-density optical disk. We performed high-speed tracking, and the experimental results show that the ZPET-FF control is more precise than feedback control. The residual tracking error is suppressed to 6.3 nm at a disk rotation speed of 10800 rpm on optical disk drives having an object lens with a numerical aperture (NA) of 0.85 and media with a track pitch of 0.32 μm, such as the Blu-ray disc and broadcast-use optical disk.
2007-06-30