Optical storage device, optical device and servo controlling...

Details Optical storage device, optical device and servo controlling... Optical storage device, optical device and servo controlling...

2007-12-11

2007-12-11

Wellington, Andrea (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044350

Reexamination Certificate

active

10972614

ABSTRACT:
The present invention realizes stable focus entry control even in the case where a wideband focus error signal is used with which the focus error signal sensitivity and the level in the vicinity of a focus point vary depending on a light path length. A second focus error signal having a wide range is used, causing an objective lens to approach a disk while maintaining a predetermined rate of change with respect to time, and, during approach, a transition to focus servo is performed by detecting the focus position according to the first focus error signal.

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