Method and apparatus for playing back multilayer disk

Details Method and apparatus for playing back multilayer disk Method and apparatus for playing back multilayer disk

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

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