Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1992-11-09
1998-04-28
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4428, 369 4438, 369 4429, G11B 709
Patent
active
057454493
ABSTRACT:
An optical information recording and/or reproducing apparatus includes a device for forming first and second light spots on an optical information recording medium to perform recording and/or reproducing of information on the recording medium and a tracking control device for conducting tracking control for at least one of the first and the second light spots. The optical information recording apparatus may further includes a detecting device for detecting an eccentricity amount of the recording medium, a calculating device for calculating a tracking offset amount to be assigned at a predetermined ratio to the first and second light spots based on the eccentricity amount detected, position information of the first light spot on the recording medium, and distance information between the first and the second light spots, and an applying device for applying the offset amount calculated to the tracking control device. The recording apparatus may have a detecting device for detecting a relative track deviation amount of the first and second light spots, and a calculating device for calculating a tracking offset amount to assign the track deviation amount detected at a predetermined ratio to the first and second light spots.
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Patent Abstracts of Japan, vol. 8, No. 121, Kokai No. 59-028249, Jun. 1984.
Patent Abstracts of Japan, vol. 8, No. 257, Kokai No. 59-127239, Nov. 1984.
Canon Kabushiki Kaisha
Tran Thang V.
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