Tetsuo Semba, Toshiki Hirano, et al.
IEEE Transactions on Magnetics
In optical disk drives, interactions between the electromechanical actuators and the servo error generation systems can cause instabilities in the operation of individual servo loops. We examine the effects of these interactions on the servo loops of an optical disk drive in which a galvano fine-tracking actuator, a push-pull tracking error detection scheme, and an astigmatic focus error detection method are used. Also, we describe a digital servo controller that effectively cancels the effects of the deleterious interactions, resulting in stable operation.
Tetsuo Semba, Toshiki Hirano, et al.
IEEE Transactions on Magnetics
Toshiki Hirano, Long-Sheng Fan, et al.
IMECE 1998
Tetsuo Semba
CDC 2001
Toshiki Hirano, Matthew White, et al.
IMECE 2001