Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1990-10-01
1993-06-08
Psitos, Aristotelis
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4432, G11B 700
Patent
active
052185850
ABSTRACT:
The invention is an optical disk drive which controls mechanical feedback to a focus servo actuator by shifting the phase of the feedback along its path back to the servo an additional 180 degrees to eliminate the degradation of the phase margin and prevent servo instability. The phase shift may be induced at any practical location along the feedback path. The phase shift is preferably induced by creating a slit or opening in the base of the optical disk drive. The opening must be positioned properly, shaped appropriately, and large enough to create a new base resonant frequency which prevents the opposite sides thereof from vibrating in phase. Alternatively, the phase shift may be induced by altering other components in the feedback path. For example, the phase shift can be induced by modifying the spindle motor assembly to create a new spindle resonant frequency.
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Aviles Henry E.
Childers Edwin R.
Kokubo Tetsuya
Matsushita Hiroshi
McReynolds David P.
International Business Machines - Corporation
Psitos Aristotelis
Schecter M. W.
Tran Thang V.
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