Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1992-03-05
1993-12-21
McElheny, Jr., Donald E.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4434, G11B 700
Patent
active
052726860
ABSTRACT:
An optical disk driving apparatus for driving an optical disk which comprises annular tracks having a data area and a servo area. Center servo data pits are disposed on and along a track center. First offset servo data pits are disposed on one side of the track center. Second offset servo data pits are disposed on the other side of the track center. Each of the first and second pits is offset by a predetermined length away from the track center. The apparatus comprises a servo signal generator for detecting the pits using an optical spot and generating servo signals corresponding to the pits. The apparatus also comprises a detector for obtaining a tracking signal by subtracting the servo signals for the first and second pits. The apparatus further comprises a first comparator for comparing the servo signals for the center pits and the first pits, a second comparator for comparing the servo signals for the center pits and the second pits and a detector for detecting the misalignment of the optical spot with the track center by using outputs of the first and second comparators.
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T. Takeuchi, et al., "Clock Jitter in Sampled Servo Format," International Symposium on Optical Memory 1987 Technical Digest, p. 137.
McElheny Jr. Donald E.
Ricoh & Company, Ltd.
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