Optical disc drive and control method thereof

Details Optical disc drive and control method thereof Optical disc drive and control method thereof

2011-02-15

2011-02-15

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C044S361000, C044S361000

Reexamination Certificate

active

07889606

ABSTRACT:
An optical disc drive and a control method thereof are disclosed to prevent unstable servo-control of a pickup module caused by an abnormal control signal, when recording/reproducing/erasing of information on/from an optical disc in the optical disc drive, and in particularly, possible collision between the pickup module and the optical disc, even when the pickup module very closely approaches the surface of the optical disc during recording/reproducing/erasing of information on/from a high density optical disc. The optical disc drive includes a pickup module having an objective lens focusing a laser on the surface of a recording layer of the optical disc, and a servo-controlling unit performing the focus servo-control of the pickup module using a high frequency broadband control and a low frequency broadband control of a focus error signal where the high frequency broadband control is performed prior to the frequency broadband control.

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