Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2001-08-14
2008-12-16
Nguyen, Hoa T. (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044370, C369S044410
Reexamination Certificate
active
07466636
ABSTRACT:
In order to obtain a corrected or compensated focus error signal or track error signal, it is proposed to generate primary and secondary scanning beams incident on adjacent tracks of an optical recording medium and to detect the primary and secondary scanning beams reflected from the optical recording medium in order to derive from them primary-beam and secondary-beam focus error signals or primary-beam and secondary-beam track error signals, which are subsequently normalized in order to obtain the compensated focus error signal or track error signal from the normalized primary-beam and secondary-beam error signals by means of weighted combinations. As a result of the normalization, the corrected or compensated focus error signal or track error signal is generated independently of the reflection properties of the respectively scanned track.
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Patent Abstracts of Japan, vol. 2000, No. 10, Nov. 17, 2000 & JP 2000-187857.
Büchler Christian
Zucker Friedhelm
Chu Kim
Fried Harvey D.
Laks Joseph J.
Nguyen Hoa T.
Thomson Licensing
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