Method of focus error signal adjustment in optical disk...

Details Method of focus error signal adjustment in optical disk... Method of focus error signal adjustment in optical disk...

2006-11-21

2009-12-08

Neyzari, Ali (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044350

Reexamination Certificate

active

07630279

ABSTRACT:
A method for a focus error signal adjustment in an optical disk device which shapes a focus error signal and enables a high-accuracy focus servo is provided.In a DVD-RAM having an emboss data zone and a rewritable data zone, a focus error signal is generated with the DVD-RAM remaining still in a position where an emboss pit is not formed in the rewritable data zone, and a waveform of the FE signal is shaped so that the waveform is symmetrical with respect to a reference point. Then, the FE signal is generated in the emboss data zone and an amplitude of the FE signal is adjusted. The amplitude of the signal which is obtained by increasing the the amplitude of the FE signal whose amplitude is adjusted by approximately 6 dB is applied to the amplitude of the focus error signal in the rewritable data zone. Consequently, a high-accuracy focus servo based on the FE signal, whose amplitude is adjusted and waveform is shaped, can be achieved without an error caused by the emboss pit.

REFERENCES:
patent: 6654322 (2003-11-01), Komoike et al.
patent: 2002/0191499 (2002-12-01), Ando et al.
patent: 2004/0100841 (2004-05-01), Buchler et al.
patent: 2001-222826 (2001-08-01), None
patent: 2003-233915 (2003-08-01), None
Isaoh Satoh et al., Key Technology for High Density Rewritable DVD (DVD-RAM), Mar. 1998, IEEE, Transactions on Magnetics, vol. 34, No. 2, pp. 338-339.

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