Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1994-10-12
1996-05-21
Psitos, Aristotelis
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4437, 369 4426, G11B 7085
Patent
active
055196799
ABSTRACT:
An apparatus and method for providing a sampled tracking error signal in an optical system using multiple illumination spots. An optical source generates radiation which is applied to a storage medium to produce a first illumination spot, a second illumination spot and a third illumination spot thereon. A return beam resulting from application of the radiation to the medium is detected, and a data signal is generated from the detected return beam. A sampled tracking error signal is generated from a first sample of the data signal, taken when the second spot illuminates a portion of a tracking mark, and a second sample of the data signal, taken when the third spot illuminates another portion of a tracking mark. The data signal samples may be normalized to samples of a source monitor signal. The data signal may be generated from magneto-optic, write-once, or other types of optical storage media.
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Eastman Kodak Company
Owens Raymond L.
Psitos Aristotelis
Tran Thang V.
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