Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1991-06-21
1993-07-13
McElheny, Jr., Donald E.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
G11B 700
Patent
active
052280187
ABSTRACT:
An optical information recording/reproducing apparatus in which a deviation of a neutral position of an objective lens from a reference position in a tracking direction is detected as an off-set signal and the position of the objective lens is controlled on the basis of the thus detected deviation such that that the neutral position of the objective lens is coincident with the reference position before a tracking servo operation is initiated. The deviation of the neutral position of the objective lens from the reference position in the range at which the objective lens is moved under the tracking servo control system is corrected. Therefore, even if the apparatus is set in an inclined manner, the tracking servo operation and the other desired operations conducted on the basis of the off-set signal can be always conducted in a stable manner.
REFERENCES:
patent: 4769803 (1988-09-01), Yamamiya
patent: 5121373 (1992-06-01), Barton et al.
McElheny Jr. Donald E.
Olympus Optical Co,. Ltd.
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