Dynamic information storage or retrieval – Systems having plural physically distinct independent tracks... – Having layered storage medium
Patent
1996-09-27
1998-05-05
Hindi, Nabil
Dynamic information storage or retrieval
Systems having plural physically distinct independent tracks...
Having layered storage medium
G11B 374
Patent
active
057485976
ABSTRACT:
A method and apparatus for focusing on a multi-layered disk is disclosed. The arrangement operates so that when it is determined to focus on the first layer, the focus actuator voltage is rapidly decreased to first bring down the objective lens, then the focus actuator voltage is slowly increased to bring the objective lens up, and focus on the first layer is achieved according to the detection status of a focus error signal; when it is determined to focus on the second layer, the focus actuator voltage is rapidly increased to bring up the objective lens, then the focus actuator voltage is slowly decreased to lower the objective lens, and focusing on the second layer is achieved according to the detection status of a focus error signal.
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Hindi Nabil
Samsung Electronics Co,. Ltd.
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