Optical disk apparatus

Details Optical disk apparatus Optical disk apparatus

2011-01-04

2011-01-04

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044350, C369S044360, C369S094000

Reexamination Certificate

active

07864638

ABSTRACT:
An optical disk apparatus according to the present invention is capable of reading data from an optical disk102which has a plurality of information recording layers, including a first information recording layer whose distance from a disk surface is relatively small and a second information recording layer whose distance from the disk surface is relatively large. This optical disk apparatus includes: a focus control section117for causing a converging point of the light beam to be positioned on an arbitrary information recording layer of the optical disk102; a tracking control section118for causing the converging point of the light beam to be positioned on a predetermined track of the information recording layer; and a gain switching section108capable of changing gain characteristics of at least one of the focus control section117and the tracking control section118. The gain switching section108prescribes a gain crossover frequency when reading data from the first information recording layer to be a value which is lower than a gain crossover frequency when reading data from the second information recording layer.

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