Apparatus of controlling tracking for a disk

Details Apparatus of controlling tracking for a disk Apparatus of controlling tracking for a disk

2006-08-08

2006-08-08

Korzuch, William (Department: 2652)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053140

Reexamination Certificate

active

07088647

ABSTRACT:
An apparatus includes a controller storing information on dense/sparse state of the tracking error signal in connection with characteristic of the signal generated by a phase encoder while tracking servo of a servo unit is inactivated, and, in data reproduction mode, identifying a current disk phase based on characteristic of the signal generated by the phase encoder, and adjusting tracking characteristic of the servo unit based on the stored information in connection with the signal characteristic in order to compensate an effect rate of eccentricity on the identified disk phase. Through minute adjustment of servo characteristic for each disk phase, error range of TE signal to track in real time is reduced. Therefore, tracking for an eccentric disk becomes easier and more reliable.

REFERENCES:
patent: 5644560 (1997-07-01), Hori
patent: 5717679 (1998-02-01), Mashimo et al.
patent: 6118739 (2000-09-01), Kishinami et al.
patent: 6768705 (2004-07-01), Hirai
patent: 2001/0019524 (2001-09-01), Na

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