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

Abstract

The effect of the addition of mercury to a conventional caesium neutralized diode is described. A pronounced Penning effect was found, the mercury 63P1-63D1,, transitions being the most efficient for the volume ionization of caesium atoms. The increased electron scattering due to the introduction of mercury into the diode is to a large extent minimized by the low collision cross section, at 0.17 ev, due to the Ramsauer effect. Consequently, it appears that the performance of the diode operating under arc mode conditions may be significantly improved by the addition of mercury.

Control Methods in Data-Storage Systems

“…By considering the pull-in capability, steady track following can be achieved by an add-on DOB designed in the time domain [137], [139]. At high rotational frequencies, modifications to conventional DOBs achieve better performance than conventional DOBs [154], [155].…”

Servo techniques for optical disk drives —high‐speed and precise optical beam‐positioning control—

“…We hypothesize that this result is caused by the effect of the LPF that is included in the ZPET-FF controller. As the cutoff frequency of the LPF decreases lowers, the effect of suppressing tracking error also tends to decrease [10].…”

Robust and Quick Response Tracking Servo System for High Rotational Speed Optical Disk System

“…In the near future, the disk rotation speed of the optical disk system becomes higher than 10000[rpm] [1] . Therefore, the tracking servo system for optical disk system must have the quick response on condition of high disk rotation speed.…”

“…In our previous work [1] , the feedforward tracking control system with ZPET [9]. [10] controller and the prediction of tracking error is able to reduce the residual tracking error and keep tracking error on condition of high disk rotation speed.…”