Optical disk device having a focus offset controller

Details Optical disk device having a focus offset controller Optical disk device having a focus offset controller

1996-03-21

1998-05-05

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4434, 369 4435, 369 54, G11B 7095

Patent

active

057485844

ABSTRACT:
An optical disk device is provided which enables the focus offset to be automatically adjusted with a high accuracy. In automatic control in a microcomputer, initial focus offset adjusting data (AO) are first output, and the data is stepwise changed from the initial value AO. In this case, a difference in phase between reproduced EFM signals and channel clocks is integrated in an integration circuit at given time intervals, and, thereafter, focus offset adjusting data, which provide the minimum phase difference integration data, are output as the optimal focus offset adjusting data.

REFERENCES:
patent: 4669074 (1987-05-01), Hsieh et al.
patent: 4730294 (1988-03-01), Funada
patent: 4823330 (1989-04-01), Arter et al.
patent: 4907212 (1990-03-01), Pharris et al.
patent: 5164932 (1992-11-01), Fennema et al.
patent: 5475664 (1995-12-01), Shimizume et al.

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