Method for adjusting focus bias in optical disk device

Details Method for adjusting focus bias in optical disk device Method for adjusting focus bias in optical disk device

2008-01-15

2008-01-15

Tran, Thang V. (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044260

Reexamination Certificate

active

07319642

ABSTRACT:
Disclosed is a method for adjusting focus bias in an optical disk device. When a focus bias adjustment operation for an optical disk such as a DVD-RAM is performed, a focus bias offset value at which the smallest jitter value of a high frequency signal is detected is set as an optimum focus bias offset value. A physical information data area, which has an embossed form and is recorded in a data area of the disk in a dispersed manner, is detected so that the jitter value of the high frequency signal is measured only for areas other than the detected physical information data area. This achieves a focus bias adjustment operation optimal for an optical disk such as a DVD-RAM, thereby enabling a secure focusing servo operation thereof.

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