Method for determining track searching direction

Details Method for determining track searching direction Method for determining track searching direction

2007-04-16

2009-11-10

Tran, Thang V (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044290

Reexamination Certificate

active

07616535

ABSTRACT:
A method for determining a track searching direction is disclosed. The method takes advantage of the characteristic that the movement of the photo-diode with respect to the optical disk is not perpendicular to the track direction. Therefore, the phase difference between the front side and the rear side of the photo-diode could be used to define a seeking error signal. The seeking error signal is used, together with a tracking error (TE) signal and a radio frequency ripple (RFRP) signal, to determine the track searching direction. Because the seeking error signal has a better signal-to-noise ratio, the phase lead or lag can be determined more accurately. As a result, the accuracy of detecting the track searching direction on a blank disk is improved.

REFERENCES:
patent: 5914922 (1999-06-01), Supino et al.
patent: 7120095 (2006-10-01), Ma et al.
patent: 2005/0219971 (2005-10-01), Shih et al.

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