Dynamic information storage or retrieval – Systems having plural physically distinct independent tracks... – Having layered storage medium
Patent
1996-08-15
1997-10-28
Hindi, Nabil
Dynamic information storage or retrieval
Systems having plural physically distinct independent tracks...
Having layered storage medium
369112, 369 4425, G11B 700
Patent
active
056823720
ABSTRACT:
There is disclosed a method of playing back information from an optical multilayer disk having a plurality of recording disks stacked on top of each other, by the use of an optical pickup device. In order to switch the focused recording layer from a first one to a second one so that data is read from the second recording layer, the focus balanced condition of the pickup device is switched from a setting providing a focus error characteristic adapted for the first recording layer to a reference setting providing a neutral focus error characteristic. Then, the focal point of the pickup device is moved from the first recording layer. Subsequently, the pickup device is focused onto the second recording layer, and data is read from the second recording layer. Thereafter, the focus balanced condition of the pickup device is switched to a setting adapted to the second recording layer.
REFERENCES:
patent: 4716283 (1987-12-01), Ando
Usui Tetsuo
Utsumi Masamichi
Yamakawa Akio
Hindi Nabil
Kananen Ronald P.
Sony Corporation
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