Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1998-07-14
2000-12-12
Edun, Muhammad
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 54, G11B 700
Patent
active
06160772&
ABSTRACT:
A tilt control device for an optical disk device including a tilt error detecting section for detecting a tilt in radial tilt direction between direction of optical axis of an optical pickup at a point where the optical axis crosses an optical disk recording surface and direction perpendicular to the recording surface, a tilt actuator for driving the optical axis, a first tilt control circuit for driving the tilt actuator in accordance with a detected tilt error to correct the tilt error, a section for detecting a tilt amount from a reference position in the radial tilt direction of the tilt actuator, a section for detecting a position of the optical pickup in the radial direction of the disk, a storage section for prestoring tilt amount characteristics necessary for correcting tilt errors at respective positions in the radial direction of the disk, a second tilt control circuit for driving the tilt actuator in accordance with detection by the tilt amount detecting section for realizing a corresponding tilt amount by using, as a target value, a tilt amount given by the disk radial direction position-tilt amount characteristics at the respective positions in the radial direction of the disk, and a control section for performing a tilt control by the first tilt control circuit during recording on or reproduction and, during a search operation, performing a tilt control by the second tilt control circuit.
REFERENCES:
patent: 5302834 (1994-04-01), Murao
patent: 5430699 (1995-07-01), Matsubara et al.
patent: 5703855 (1997-12-01), Kirino et al.
Edun Muhammad
Yamaha Corporation
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