Method for determining relationship between difference of...

Details Method for determining relationship between difference of... Method for determining relationship between difference of...

2004-12-01

2008-12-02

Dinh, Tan X (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S044290, C369S044250

Reexamination Certificate

active

07460455

ABSTRACT:
A method used in an optical storage device having a pickup head. The pickup head includes an object lens, a first and a second light source. The object lens focuses the laser light generated by the first or the second light source onto a first or a second focal point. A driving control effort is used to change the location of the object lens. The method includes the following steps: providing the driving control effort to move the object lens; measuring a first parameter when the first focal point passes through a predetermined layer of an optical disc; measuring a second parameter when the second focal point passes through the predetermined layer of the optical disc; and (d) determining the relationship between the difference of object lens location and the driving control effort according to the predetermined distance, the first parameter, and the second parameter.

REFERENCES:
patent: 5831952 (1998-11-01), Yamada et al.
patent: 6674696 (2004-01-01), Ichimura et al.
patent: 2005/0041541 (2005-02-01), Tateishi et al.
patent: 2005/0052977 (2005-03-01), Sun

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